Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0005634 nucleus	IBA GO_REF:0000033	ACCEPT	Summary: HSP70/HSPA1B localizes to the nucleus under stress conditions. IDA evidence from PMID:10205060 and PMID:17167422 confirms nuclear localization. UniProt notes HSPA1B translocates to the nucleus during heat shock, where it participates in mRNA decay regulation and erythropoiesis-related functions. Reactome entries describe HSP70 nuclear transport via Hikeshi (R-HSA-5252041) and nuclear roles in HSF1 regulation. Reason: Well-supported by phylogenetic inference and confirmed by multiple IDA annotations. HSPA1B is known to shuttle between cytoplasm and nucleus, particularly under stress conditions. Supporting Evidence: PMID:10205060 Induction of hsp70 by heat shock, down-regulation of the ubiquitin-proteasome network, or inactivation of ubiquitinating enzyme E1 all result in hsp70 sequestration of AUF1 in the perinucleus-nucleus
GO:0005737 cytoplasm	IBA GO_REF:0000033	ACCEPT	Summary: HSPA1B is predominantly cytoplasmic under basal conditions. UniProt lists cytoplasm as a primary subcellular location (ECO:0000269\|PubMed:17289661). Multiple IDA annotations confirm cytoplasmic localization (PMID:10859165, PMID:24061851, PMID:9553041, PMID:24790089). Reason: Core localization for HSPA1B, well-supported by IBA and multiple IDA annotations.
GO:0005886 plasma membrane	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: Phylogenetic inference places HSPA1B at the plasma membrane. HSP70 family members have been reported at the cell surface in some contexts, including as a receptor for rotavirus A entry (PMID:16537599, referenced in UniProt). This is consistent with the IBA annotation. Reason: Plasma membrane localization is not a core feature of HSPA1B function but is phylogenetically supported and consistent with some reported activities such as virus receptor function.
GO:0016887 ATP hydrolysis activity	IBA GO_REF:0000033	ACCEPT	Summary: ATP hydrolysis is the central enzymatic activity of HSP70 chaperones. HSPA1B has a well-characterized N-terminal ATPase domain (NBD, residues 2-386) with multiple ATP binding sites confirmed by X-ray crystallography. IDA evidence from PMID:21231916 directly demonstrates ATPase activity, and Reactome entry R-HSA-3371422 describes ATP hydrolysis by HSP70 in detail. Reason: Core molecular function of HSPA1B. ATP hydrolysis drives the chaperone cycle and is essential for all HSP70 functions. Supporting Evidence: PMID:21231916 HSPA6 has a functional substrate-binding domain and possesses intrinsic ATPase activity that is as high as that of the canonical HSPA1A when stimulated by J-proteins.
GO:0031072 heat shock protein binding	IBA GO_REF:0000033	ACCEPT	Summary: HSPA1B interacts with numerous heat shock proteins including HSP40/DNAJ co-chaperones (DNAJC7, DNAJC8, DNAJC9, DNAJB1), HSP90, and HSP110/HSPH1. These interactions are essential for the chaperone cycle. IPI evidence from PMID:17182002, PMID:21231916, and PMID:23921388 confirms these interactions. Reason: Core function. HSP70 co-chaperone interactions are fundamental to the chaperone cycle and are well-supported by both phylogenetic and experimental evidence.
GO:0044183 protein folding chaperone	IBA GO_REF:0000033	ACCEPT	Summary: HSPA1B is a bona fide ATP-dependent protein folding chaperone. This is the core molecular function annotation for this gene. IDA evidence from PMID:15603737 directly demonstrates chaperone activity. UniProt describes HSPA1B as a "Molecular chaperone implicated in a wide variety of cellular processes, including protection of the proteome from stress, folding and transport of newly synthesized polypeptides." Reason: The defining molecular function of HSPA1B. Well-supported by both phylogenetic inference and direct experimental evidence. Supporting Evidence: PMID:21231916 whereas overexpression of HSPA1A protected cells from heat-induced cell death, overexpression of HSPA6 did not
GO:0005829 cytosol	IBA GO_REF:0000033	ACCEPT	Summary: Cytosol is the primary subcellular compartment where HSPA1B exerts its chaperone function. Confirmed by IDA (GO_REF:0000052, PMID:21231916) and multiple Reactome TAS annotations describing cytosolic chaperone activities. Reason: Core localization for HSPA1B chaperone function in the cytosol.
GO:0042026 protein refolding	IBA GO_REF:0000033	ACCEPT	Summary: Protein refolding is a core biological process for HSPA1B. IDA evidence from PMID:21231916 and PMID:15603737 demonstrates luciferase refolding activity. PMID:27708256 shows that acetylation state determines whether HSPA1B functions in protein refolding vs degradation. Reason: Core biological process. HSPA1B actively refolds heat-denatured substrates through its ATP-dependent chaperone cycle. Supporting Evidence: PMID:21231916 Overexpressed chaperones that suppressed polyQ aggregation were found not to be able to stimulate luciferase refolding. Inversely, chaperones that supported luciferase refolding were poor suppressors of polyQ aggregation.
GO:0032436 positive regulation of proteasomal ubiquitin-dependent protein catabolic process	IBA GO_REF:0000033	ACCEPT	Summary: HSPA1B participates in targeting misfolded proteins for proteasomal degradation through its interaction with STUB1/CHIP E3 ubiquitin ligase. PMID:27708256 shows that deacetylated HSP70 binds STUB1, promoting ubiquitin-mediated protein degradation. PMID:12150907 demonstrates the CHIP-Hsp70-Parkin complex facilitating ubiquitination. Reason: Core function of the HSP70 chaperone system. HSP70 triages substrates between refolding and degradation pathways, with STUB1/CHIP mediating the degradation arm.
GO:0046718 symbiont entry into host cell	IEA GO_REF:0000108	KEEP AS NON CORE	Summary: IEA annotation from logical inference. UniProt notes that HSPA1B serves as a post-attachment receptor for rotavirus A to facilitate entry into the cell (PMID:16537599). This is a specialized, non-core function. Reason: Supported by virus receptor activity documented in UniProt, but this is a secondary role exploited by pathogens rather than a core cellular function.
GO:0000166 nucleotide binding	IEA GO_REF:0000043	ACCEPT	Summary: IEA from UniProt keyword mapping. HSPA1B binds ATP/ADP through its N-terminal NBD, confirmed by crystal structures and IDA evidence for ATP binding (PMID:23921388). This is a broad parent term of ATP binding. Reason: Correct but very general. Subsumed by the more specific ATP binding annotation which is also present. Acceptable as an IEA broadening.
GO:0001618 virus receptor activity	IEA GO_REF:0000043	KEEP AS NON CORE	Summary: IEA from UniProt keyword mapping for Host cell receptor for virus entry. UniProt documents that HSPA1B serves as a post-attachment receptor for rotavirus A (PMID:16537599). Reason: Documented in UniProt but represents a non-core function exploited by viruses.
GO:0001664 G protein-coupled receptor binding	IEA GO_REF:0000117	MARK AS OVER ANNOTATED	Summary: IEA from ARBA models. IDA evidence from PMID:12150907 documents HSP70 interaction with Pael-R (an orphan GPCR). UniProt also records an interaction with F2RL1 (a GPCR). However, this binding is in the context of chaperone substrate recognition, not classical GPCR signaling. Reason: While HSPA1B does bind GPCRs such as Pael-R, this is in the context of chaperone-substrate interaction, not GPCR-specific binding activity. The term implies a specific functional binding to GPCRs as signaling partners.
GO:0005524 ATP binding	IEA GO_REF:0000120	ACCEPT	Summary: IEA from combined automated annotation. ATP binding is a core function of HSPA1B confirmed by crystal structures of the NBD domain with ADP/ATP and IDA evidence (PMID:23921388). Reason: Core molecular function. ATP binding drives the chaperone cycle.
GO:0005737 cytoplasm	IEA GO_REF:0000044	ACCEPT	Summary: IEA from UniProt subcellular location mapping. Confirmed by multiple IDA annotations and IBA. Reason: Correct and redundant with IBA and IDA annotations for this localization.
GO:0005813 centrosome	IEA GO_REF:0000044	ACCEPT	Summary: IEA from UniProt subcellular location. UniProt records centrosome localization (ECO:0000269\|PubMed:27137183). IDA evidence from PMID:27137183 confirms HSP70 accumulates at the mitotic centrosome during prometaphase to metaphase. Reason: Supported by experimental evidence. HSPA1B localizes to centrosomes during mitosis where it regulates centrosome integrity.
GO:0005814 centriole	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:24061851 and GO_REF:0000052 confirms centriole localization of HSPA1A (functionally identical to HSPA1B) under stress conditions. Reason: Confirmed by IDA evidence showing stress-induced centriole localization.
GO:0006402 mRNA catabolic process	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. Supported by IDA from PMID:10205060 which demonstrates that hsp70 participates in AU-rich element-mediated mRNA decay by sequestering AUF1 in the perinucleus-nucleus during heat shock. Reason: While experimentally supported, mRNA catabolism is a secondary consequence of HSP70 chaperone activity on AUF1, not a core function.
GO:0008285 negative regulation of cell population proliferation	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:9553041 shows that HSP70 association with WT1 is required for WT1-mediated inhibition of cell proliferation. Reason: Experimentally supported but represents a secondary, context-dependent function dependent on interaction with specific partners like WT1.
GO:0016235 aggresome	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:15885686 confirms aggresome localization. HSP70 chaperones are recruited to aggresomes as part of the protein quality control response. Reason: Confirmed by IDA evidence. Aggresome localization is consistent with HSP70 role in protein quality control.
GO:0016607 nuclear speck	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IDA evidence from PMID:9553041 confirms nuclear speck localization of HSP70. Reason: Experimentally confirmed but represents a specific subnuclear localization that is not central to HSPA1B core function.
GO:0016887 ATP hydrolysis activity	IEA GO_REF:0000120	ACCEPT	Summary: IEA from combined automated annotation. Redundant with IBA and IDA annotations for the same term. Core function of HSPA1B. Reason: Correct and consistent with IBA and IDA evidence for this core activity.
GO:0030308 negative regulation of cell growth	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:9553041 shows HSP70 is required for WT1-mediated growth inhibition. Reason: Context-dependent secondary function mediated through WT1 interaction.
GO:0031072 heat shock protein binding	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. Redundant with IBA and multiple IPI annotations for the same term. Well-supported by extensive co-chaperone interaction data. Reason: Correct and consistent with IBA and IPI evidence.
GO:0031397 negative regulation of protein ubiquitination	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IDA evidence from PMID:12150907 shows HSP70 participates in regulating ubiquitination of Pael-R in the CHIP-Parkin complex. HSP70 binding can shield substrates from ubiquitination. Reason: Experimentally supported but represents a context-dependent regulatory outcome of chaperone activity rather than a core function.
GO:0031625 ubiquitin protein ligase binding	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IPI evidence from PMID:12150907 and PMID:15603737 confirms binding to E3 ligases CHIP/STUB1, Parkin, and BAG5. This is a key part of the chaperone triage system. Reason: Core co-chaperone interaction. HSP70 binding to E3 ubiquitin ligases like STUB1/CHIP is integral to the protein quality control triage mechanism.
GO:0032757 positive regulation of interleukin-8 production	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:24790089 shows HSP70 involvement in NOD2-mediated NF-kappaB signaling, which leads to IL-8 production in response to bacterial cell wall fragments. Reason: Experimentally supported but a downstream consequence of HSP70 stabilization of NOD2, not a core chaperone function.
GO:0034599 cellular response to oxidative stress	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. TAS evidence from PMID:24252804 supports this annotation in the context of Parkinson disease pathogenesis. Reason: HSP70 is induced by and participates in oxidative stress response, but this is a general stress-responsive phenotype rather than a core function.
GO:0042026 protein refolding	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. Redundant with IBA and IDA annotations for the same term. Core function of HSPA1B. Reason: Correct and consistent with IBA and multiple IDA annotations.
GO:0042826 histone deacetylase binding	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IPI evidence from PMID:16809764 confirms interaction with HDAC8, and UniProt documents interaction with HDAC4 (PMID:27708256). HDAC4 deacetylates HSP70 at Lys-77 to regulate chaperone function. Reason: Confirmed by experimental evidence. HDAC binding is functionally relevant to regulation of HSP70 chaperone activity.
GO:0044183 protein folding chaperone	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. Redundant with IBA and IDA for the same core molecular function. Reason: Core molecular function, confirmed by multiple evidence types.
GO:0045648 positive regulation of erythrocyte differentiation	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:17167422 shows Hsp70 protects GATA-1 from caspase-3-mediated cleavage during erythropoiesis. Reason: Experimentally supported but a tissue-specific downstream consequence of HSP70 anti-apoptotic activity rather than a core function.
GO:0046034 ATP metabolic process	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:23921388 supports this. HSPA1B hydrolyzes ATP as part of its chaperone cycle. Reason: Correct. ATP metabolic process is an inherent aspect of the ATPase-driven chaperone cycle.
GO:0048471 perinuclear region of cytoplasm	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:10205060 and PMID:15603737 confirms perinuclear localization. Reason: Confirmed by IDA evidence. Perinuclear localization is observed particularly during stress conditions.
GO:0050821 protein stabilization	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. TAS evidence from PMID:24252804 supports this. PMID:24790089 directly demonstrates HSP70 stabilizes NOD2 by increasing its half-life. UniProt also describes HSP70 stabilization of ATF5 (PMID:22528486). Reason: Well-supported function. HSP70 chaperone activity inherently stabilizes client proteins, preventing misfolding and degradation.
GO:0051082 unfolded protein binding	IEA GO_REF:0000117	MODIFY	Summary: GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962). This IEA annotation from ARBA machine learning models reflects the well-known ability of HSP70 chaperones to bind unfolded/misfolded proteins as substrates, but the term conflates substrate binding with the chaperone activity itself. HSPA1B is a bona fide ATP-dependent foldase chaperone that actively assists protein folding through iterative cycles of ATP hydrolysis, substrate binding, and release (PMID:21231916, PMID:24012426). The correct molecular function annotation is GO:0044183 (protein folding chaperone), which already has both IBA and IDA support for this gene product. UniProt describes HSPA1B as a "Molecular chaperone implicated in a wide variety of cellular processes, including protection of the proteome from stress, folding and transport of newly synthesized polypeptides" (UniProt:P0DMV9). Reason: GO:0051082 is being obsoleted. HSPA1B does not merely bind unfolded proteins passively; it is an active ATP-dependent protein folding chaperone. The replacement term GO:0044183 (protein folding chaperone) accurately captures the molecular function and is already annotated to HSPA1B via IBA (GO_REF:0000033) and IDA (PMID:15603737) evidence. Proposed replacements: protein folding chaperone Supporting Evidence: PMID:21231916 Overexpressed chaperones that suppressed polyQ aggregation were found not to be able to stimulate luciferase refolding. Inversely, chaperones that supported luciferase refolding were poor suppressors of polyQ aggregation.
GO:0055131 C3HC4-type RING finger domain binding	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IPI evidence from PMID:25281747 confirms interaction with RNF207, a RING finger protein. HSP70 also interacts with CHIP/STUB1 which contains a U-box domain related to RING fingers. Reason: Confirmed by experimental evidence for binding to RING domain proteins.
GO:0070370 cellular heat acclimation	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IMP evidence from PMID:21231916 confirms that HSPA1A (functionally identical to HSPA1B) protects cells from heat-induced cell death and is involved in thermotolerance. Reason: Core stress-response function. HSPA1B is heat-inducible and protects cells during heat stress.
GO:0070434 positive regulation of nucleotide-binding oligomerization domain containing 2 signaling pathway	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:24790089 confirms that HSP70 binds and stabilizes NOD2, enhancing NOD2-mediated signaling in response to bacterial cell wall fragments. Reason: Experimentally supported but represents a specific downstream signaling consequence of HSP70 chaperone activity on NOD2, not a core function.
GO:0071383 cellular response to steroid hormone stimulus	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. TAS evidence from Reactome R-HSA-3371497 documents HSP70 role in the HSP90 chaperone cycle for steroid hormone receptors. HSP70 participates in the maturation of steroid hormone receptor complexes. Reason: HSP70 participates in steroid hormone receptor maturation as part of the HSP70/HSP90 chaperone relay, but this is a general chaperone function rather than a specific steroid hormone response.
GO:0090063 positive regulation of microtubule nucleation	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:27137183 confirms HSP70 is required for microtubule nucleation from the mitotic centrosome, interacting with NEDD1 and gamma-tubulin. Reason: Experimentally supported centrosome-related function during mitosis but not a core chaperone function.
GO:0090084 negative regulation of inclusion body assembly	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:21231916 and PMID:15603737 confirms HSPA1B suppresses protein aggregation and inclusion body formation. Reason: Core chaperone function. Preventing protein aggregation and inclusion body formation is a direct consequence of HSP70 foldase activity.
GO:0140545 ATP-dependent protein disaggregase activity	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:23921388 confirms disaggregase activity. HSP70 works with co-chaperones to disaggregate and refold aggregated proteins. Reason: Core molecular function. HSP70 disaggregase activity is well-established and directly related to its protein quality control role.
GO:1901673 regulation of mitotic spindle assembly	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:27137183 shows HSP70 is required for bipolar spindle assembly, and its inhibition disrupts spindle formation. Reason: Experimentally supported but represents a specific mitotic function rather than the core chaperone activity.
GO:1903265 positive regulation of tumor necrosis factor-mediated signaling pathway	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:24790089 supports HSP70 involvement in inflammatory signaling through NOD2 stabilization. Reason: Experimentally supported downstream effect of HSP70 chaperone activity on innate immune signaling components.
GO:1904813 ficolin-1-rich granule lumen	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. TAS evidence from Reactome R-HSA-6800434 (exocytosis of ficolin-rich granule lumen proteins) supports this localization in neutrophils. Reason: Cell-type-specific localization in neutrophils, supported by Reactome but not a core localization for HSPA1B.
GO:1990904 ribonucleoprotein complex	IEA GO_REF:0000117	ACCEPT	Summary: IEA from ARBA models. IDA evidence from PMID:17289661 confirms HSPA1B is a component of IGF2BP1 (IMP1) mRNP granules containing untranslated mRNAs. UniProt notes this localization. Reason: Confirmed by mass spectrometry identification in mRNP granule complex.
GO:2001240 negative regulation of extrinsic apoptotic signaling pathway in absence of ligand	IEA GO_REF:0000117	KEEP AS NON CORE	Summary: IEA from ARBA models. IMP evidence from PMID:17167422 shows Hsp70 protects GATA-1 from caspase-3 cleavage, preventing apoptosis during erythropoiesis. Reason: Experimentally supported anti-apoptotic function but represents a specific downstream effect of HSP70 chaperone activity.
GO:0005515 protein binding	IPI PMID:28298427 Systematic protein-protein interaction mapping for clinicall...	MARK AS OVER ANNOTATED	Summary: Protein binding from systematic GPCR-protein interaction mapping. HSPA1B binds many proteins as a chaperone; protein binding is uninformative. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone that interacts with hundreds of substrates and co-chaperones. More specific binding terms are already annotated.
GO:0043123 positive regulation of canonical NF-kappaB signal transduction	IMP PMID:24790089 The molecular chaperone HSP70 binds to and stabilizes NOD2, ...	KEEP AS NON CORE	Summary: PMID:24790089 demonstrates that HSP70 stabilizes NOD2, and an HSP70 inhibitor (KNK437) decreases NOD2-mediated NF-kappaB activation in response to bacterial cell wall stimulation. Reason: Experimentally well-supported but a downstream consequence of HSP70 stabilization of NOD2 rather than a core chaperone function. Supporting Evidence: PMID:24790089 an HSP70 inhibitor, KNK437, was capable of decreasing NOD2-mediated NF-kappaB activation in response to bacterial cell wall stimulation
GO:0070434 positive regulation of nucleotide-binding oligomerization domain containing 2 signaling pathway	IMP PMID:24790089 The molecular chaperone HSP70 binds to and stabilizes NOD2, ...	KEEP AS NON CORE	Summary: PMID:24790089 shows induced HSP70 expression increases NOD2 response to bacterial cell wall fragments by stabilizing NOD2 protein. Reason: Experimentally well-supported. HSP70 enhances NOD2 signaling by increasing NOD2 stability, but this is a secondary consequence of chaperone activity. Supporting Evidence: PMID:24790089 Induced HSP70 expression in cells increased the response of NOD2 to bacterial cell wall fragments.
GO:0005814 centriole	IDA GO_REF:0000052	ACCEPT	Summary: IDA from immunofluorescence curation. HSPA1B localizes to centrioles under stress conditions, consistent with its role in centrosome integrity during mitosis (PMID:24061851, PMID:27137183). Reason: Confirmed by immunofluorescence data and consistent with published literature on HSP70 centrosome function.
GO:0005829 cytosol	IDA GO_REF:0000052	ACCEPT	Summary: IDA from immunofluorescence curation confirming cytosolic localization. Core localization for HSPA1B. Reason: Core localization confirmed by immunofluorescence.
GO:0071383 cellular response to steroid hormone stimulus	TAS Reactome:R-HSA-3371497	KEEP AS NON CORE	Summary: TAS from Reactome describing HSP90 chaperone cycle for steroid hormone receptors, in which HSP70 participates by delivering client proteins to the HSP90 complex via HOP/STIP1. Reason: HSP70 participates in steroid hormone receptor maturation as part of the HSP70-HSP90 relay system, but this is a general chaperone function.
GO:0016887 ATP hydrolysis activity	TAS Reactome:R-HSA-3371422	ACCEPT	Summary: TAS from Reactome entry R-HSA-3371422 describing ATP hydrolysis by HSP70. Core molecular function. Reason: Core molecular function, consistent with IBA and IDA annotations.
GO:0005515 protein binding	IPI PMID:33857403 DNAJC9 integrates heat shock molecular chaperones into the h...	MARK AS OVER ANNOTATED	Summary: PMID:33857403 demonstrates DNAJC9 interacts with HSP70 to integrate heat shock chaperones into the histone chaperone network. The specific interaction is with DNAJC9 via J domain. Reason: GO:0005515 protein binding is uninformative. The specific interaction with DNAJC9 is better captured by heat shock protein binding (GO:0031072).
GO:0140545 ATP-dependent protein disaggregase activity	IDA PMID:23921388 Identification and characterization of a novel human methylt...	ACCEPT	Summary: PMID:23921388 characterizes METTL21A methylation of HSP70 and shows that methylation alters chaperone affinity for alpha-synuclein fibrils. The disaggregase activity is a well-established function of HSP70 chaperones. Reason: Core molecular function. HSP70 disaggregase activity is integral to protein quality control.
GO:0016887 ATP hydrolysis activity	IDA PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	ACCEPT	Summary: PMID:21231916 directly demonstrates intrinsic ATPase activity of HSPA1A (functionally identical to HSPA1B) that is stimulated by J-protein co-chaperones. Core molecular function. Reason: Core molecular function with direct experimental evidence. Supporting Evidence: PMID:21231916 HSPA6 has a functional substrate-binding domain and possesses intrinsic ATPase activity that is as high as that of the canonical HSPA1A when stimulated by J-proteins.
GO:0005634 nucleus	IDA PMID:17167422 Hsp70 regulates erythropoiesis by preventing caspase-3-media...	ACCEPT	Summary: PMID:17167422 shows Hsp70 localizes to the nucleus where it protects GATA-1 from caspase-3 cleavage during erythropoiesis. Reason: Nuclear localization confirmed by direct assay in the context of erythropoiesis studies.
GO:0043066 negative regulation of apoptotic process	IMP PMID:17167422 Hsp70 regulates erythropoiesis by preventing caspase-3-media...	KEEP AS NON CORE	Summary: PMID:17167422 demonstrates Hsp70 prevents caspase-3-mediated cleavage of GATA-1, thereby inhibiting apoptosis during erythroid differentiation. Reason: Well-established anti-apoptotic function of HSP70 but represents a downstream consequence of chaperone activity rather than core function.
GO:0045648 positive regulation of erythrocyte differentiation	IMP PMID:17167422 Hsp70 regulates erythropoiesis by preventing caspase-3-media...	KEEP AS NON CORE	Summary: PMID:17167422 shows Hsp70 regulates erythropoiesis by preventing caspase-3-mediated cleavage of GATA-1, a key erythroid transcription factor. Reason: Experimentally supported tissue-specific function but not a core chaperone activity.
GO:0005515 protein binding	IPI PMID:27133716 A novel nuclear DnaJ protein, DNAJC8, can suppress the forma...	MARK AS OVER ANNOTATED	Summary: PMID:27133716 shows DNAJC8 interacts with HSP70. This is a specific co-chaperone interaction better captured by heat shock protein binding. Reason: GO:0005515 protein binding is uninformative. The DNAJC8 interaction is better captured by GO:0031072 (heat shock protein binding).
GO:0005515 protein binding	IPI PMID:23349634 A newly uncovered group of distantly related lysine methyltr...	MARK AS OVER ANNOTATED	Summary: PMID:23349634 identifies lysine methyltransferases that interact with molecular chaperones including HSP70. Protein binding is uninformative. Reason: GO:0005515 protein binding is uninformative for a chaperone.
GO:0032991 protein-containing complex	IDA PMID:23349634 A newly uncovered group of distantly related lysine methyltr...	ACCEPT	Summary: PMID:23349634 demonstrates HSP70 exists in complexes with lysine methyltransferases. HSP70 participates in many protein complexes as part of its chaperone function. Reason: HSP70 is found in multiple protein complexes as part of its chaperone and co-chaperone machinery.
GO:0003723 RNA binding	HDA PMID:22658674 Insights into RNA biology from an atlas of mammalian mRNA-bi...	KEEP AS NON CORE	Summary: PMID:22658674 (Castello et al. 2012) is a large-scale mRNA interactome capture study identifying mRNA-binding proteins. HSPA1B was identified as an mRNA-binding protein. This is consistent with its role in mRNP granules (PMID:17289661). Reason: High-throughput data supports RNA binding. HSP70 association with mRNP granules is documented but RNA binding is not a core chaperone function.
GO:0003723 RNA binding	HDA PMID:22681889 The mRNA-bound proteome and its global occupancy profile on ...	KEEP AS NON CORE	Summary: PMID:22681889 (Baltz et al. 2012) is another large-scale mRNA-bound proteome study confirming HSPA1B as an mRNA-associated protein. Reason: Consistent with other high-throughput data but RNA binding is not a core function of HSPA1B.
GO:0005515 protein binding	IPI PMID:15671022 Heat shock protein 70 inhibits alpha-synuclein fibril format...	MARK AS OVER ANNOTATED	Summary: PMID:15671022 shows HSP70 binds alpha-synuclein prefibrillar species, inhibiting fibril formation. This reflects chaperone substrate binding. Reason: GO:0005515 protein binding is uninformative. The alpha-synuclein interaction reflects chaperone substrate binding already captured by protein folding chaperone (GO:0044183).
GO:0005515 protein binding	IPI PMID:18975920 Interactions between Hsp70 and the hydrophobic core of alpha...	MARK AS OVER ANNOTATED	Summary: PMID:18975920 demonstrates Hsp70 interactions with alpha-synuclein hydrophobic core inhibit fibril assembly. Chaperone substrate binding. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone.
GO:0005515 protein binding	IPI PMID:21081504 ChChd3, an inner mitochondrial membrane protein, is essentia...	MARK AS OVER ANNOTATED	Summary: PMID:21081504 identifies interaction between HSPA1B and ChChd3/CHCHD3, an inner mitochondrial membrane protein. UniProt confirms this interaction. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone.
GO:0005515 protein binding	IPI PMID:9553041 Inhibition of cellular proliferation by the Wilms tumor supp...	MARK AS OVER ANNOTATED	Summary: PMID:9553041 shows HSP70 interaction with WT1 is required for WT1-mediated growth inhibition. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone.
GO:0005634 nucleus	IDA PMID:10205060 Control of mRNA decay by heat shock-ubiquitin-proteasome pat...	ACCEPT	Summary: PMID:10205060 shows hsp70 sequesters AUF1 in the perinucleus-nucleus during heat shock, confirming nuclear localization. Reason: Direct experimental evidence for nuclear localization during stress. Supporting Evidence: PMID:10205060 Induction of hsp70 by heat shock, down-regulation of the ubiquitin-proteasome network, or inactivation of ubiquitinating enzyme E1 all result in hsp70 sequestration of AUF1 in the perinucleus-nucleus
GO:0005737 cytoplasm	IDA PMID:10859165 Chaperone hsp27 inhibits translation during heat shock by bi...	ACCEPT	Summary: PMID:10859165 documents cytoplasmic localization of HSP70 in the context of translation regulation during heat shock. Reason: Core localization confirmed by direct assay.
GO:0005737 cytoplasm	TAS PMID:16130169 Proteomics of human umbilical vein endothelial cells applied...	ACCEPT	Summary: TAS from proteomics study PMID:16130169 identifying HSPA1B among 162 proteins in human endothelial cells. Reason: Core localization.
GO:0005737 cytoplasm	IDA PMID:24061851 Stress-induced localization of HSPA6 (HSP70B') and HSPA1A (H...	ACCEPT	Summary: PMID:24061851 documents cytoplasmic and centriolar localization of HSPA1A (functionally identical to HSPA1B) under stress conditions. Reason: Core localization confirmed by direct assay.
GO:0005737 cytoplasm	IDA PMID:9553041 Inhibition of cellular proliferation by the Wilms tumor supp...	ACCEPT	Summary: PMID:9553041 shows cytoplasmic localization of HSP70 in the context of WT1 interaction studies. Reason: Core localization confirmed by direct assay.
GO:0005739 mitochondrion	TAS PMID:16130169 Proteomics of human umbilical vein endothelial cells applied...	KEEP AS NON CORE	Summary: TAS from proteomics study. HSPA1B is primarily cytosolic but has been detected in mitochondrial fractions. UniProt lists mitochondrion as a TAS localization. HSP70 participates in mitochondrial protein import. Reason: Supported by proteomics data but mitochondrial localization is not a primary site for HSPA1B. Note that HSPA9/mortalin is the dedicated mitochondrial HSP70.
GO:0005783 endoplasmic reticulum	TAS PMID:16130169 Proteomics of human umbilical vein endothelial cells applied...	KEEP AS NON CORE	Summary: TAS from proteomics study. HSPA1B has been detected in ER fractions. HSP70 participates in ER stress response and ERAD. Note that HSPA5/BiP is the dedicated ER HSP70. Reason: Detected in ER fractions but HSPA1B is primarily cytosolic. HSPA5/BiP is the dedicated ER-resident HSP70.
GO:0006402 mRNA catabolic process	IDA PMID:10205060 Control of mRNA decay by heat shock-ubiquitin-proteasome pat...	KEEP AS NON CORE	Summary: PMID:10205060 directly demonstrates HSP70 role in AU-rich element-mediated mRNA decay through regulation of AUF1 localization and ubiquitination. Reason: Experimentally well-supported but a secondary function of HSP70 rather than its core chaperone activity. Supporting Evidence: PMID:10205060 Rapid decay involves AU-rich binding protein AUF1, which complexes with heat shock proteins hsc70-hsp70, translation initiation factor eIF4G, and poly(A) binding protein.
GO:0008285 negative regulation of cell population proliferation	IMP PMID:9553041 Inhibition of cellular proliferation by the Wilms tumor supp...	KEEP AS NON CORE	Summary: PMID:9553041 shows HSP70 association with WT1 is required for WT1-mediated inhibition of cellular proliferation. Reason: Context-dependent secondary function mediated through WT1 interaction.
GO:0016235 aggresome	IDA PMID:15885686 TRIM37 defective in mulibrey nanism is a novel RING finger u...	ACCEPT	Summary: PMID:15885686 shows TRIM37 forms aggresomes that are chaperone-positive, indicating HSP70 recruitment to aggresomes. Consistent with HSP70 role in protein quality control at aggresomes. Reason: Direct evidence for aggresome localization, consistent with protein quality control function.
GO:0016607 nuclear speck	IDA PMID:9553041 Inhibition of cellular proliferation by the Wilms tumor supp...	KEEP AS NON CORE	Summary: PMID:9553041 shows HSP70 localization to nuclear speckles in the context of WT1 interaction studies. Reason: Experimentally confirmed but a specific subnuclear localization that is context-dependent.
GO:0030308 negative regulation of cell growth	IMP PMID:9553041 Inhibition of cellular proliferation by the Wilms tumor supp...	KEEP AS NON CORE	Summary: PMID:9553041 demonstrates HSP70 is required for WT1-mediated growth inhibition. Reason: Context-dependent secondary function mediated through WT1 interaction.
GO:0031982 vesicle	HDA PMID:19190083 Characterization of exosome-like vesicles released from huma...	KEEP AS NON CORE	Summary: PMID:19190083 characterizes exosome-like vesicles from human tracheobronchial ciliated epithelium, identifying HSPA1B. Reason: High-throughput proteomics data. Vesicle localization is a secondary feature, not core localization.
GO:0043066 negative regulation of apoptotic process	TAS PMID:16130169 Proteomics of human umbilical vein endothelial cells applied...	KEEP AS NON CORE	Summary: TAS from proteomics study describing HSPA1B in context of endothelial cell resistance to etoposide-induced apoptosis. Reason: Anti-apoptotic function is well-established for HSP70 but represents a downstream consequence of chaperone activity.
GO:0048471 perinuclear region of cytoplasm	IDA PMID:10205060 Control of mRNA decay by heat shock-ubiquitin-proteasome pat...	ACCEPT	Summary: PMID:10205060 demonstrates that hsp70 sequesters AUF1 in the perinucleus-nucleus during heat shock, confirming perinuclear localization of HSP70 by direct assay. Reason: Confirmed by direct experimental evidence. Perinuclear localization is observed during stress conditions when HSP70 participates in mRNA decay regulation through AUF1 sequestration. Supporting Evidence: PMID:10205060 Induction of hsp70 by heat shock, down-regulation of the ubiquitin-proteasome network, or inactivation of ubiquitinating enzyme E1 all result in hsp70 sequestration of AUF1 in the perinucleus-nucleus
GO:0051082 unfolded protein binding	TAS PMID:16130169 Proteomics of human umbilical vein endothelial cells applied...	MODIFY	Summary: GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962). This TAS annotation references PMID:16130169 (Bruneel et al. 2005), a proteomics study of human umbilical vein endothelial cells during etoposide-induced apoptosis. The study identified HSPA1B among 162 proteins and discusses functions related to "protein folding" in the context of endothelial cell biology. The paper does not specifically characterize HSPA1B unfolded protein binding activity but rather identifies it in the context of broader chaperone-related functions. HSPA1B is a well-established ATP-dependent foldase chaperone and the correct molecular function term is GO:0044183 (protein folding chaperone). Reason: GO:0051082 is being obsoleted. The referenced paper (PMID:16130169) is a proteomics study that does not specifically demonstrate unfolded protein binding activity for HSPA1B but identifies it among proteins with chaperone-related functions. HSPA1B is an established protein folding chaperone whose primary molecular function is actively assisting protein folding through ATP-dependent cycles, not merely binding unfolded substrates. The replacement term GO:0044183 is already supported by direct experimental evidence (IDA, PMID:15603737) and phylogenetic inference (IBA, GO_REF:0000033). Proposed replacements: protein folding chaperone Supporting Evidence: PMID:16130169 The overall functional characterization of the 162 identified proteins from primary cultures of HUVECs confirms the metabolic capabilities of endothelium and illustrates various cellular functions more related to cell motility and angiogenesis, protein folding, anti-oxidant defenses, signal transduction, proteasome pathway and resistance to apoptosis.
GO:0070062 extracellular exosome	HDA PMID:19199708 Proteomic analysis of human parotid gland exosomes by multid...	KEEP AS NON CORE	Summary: PMID:19199708 is a proteomic analysis of human parotid gland exosomes identifying HSPA1B among exosome proteins. HSP70 is a commonly identified exosomal protein, consistent with extracellular release as described in reviews of eHsp70 biology. Reason: High-throughput proteomics data. Exosomal localization of HSP70 is well-documented but represents a non-core secondary localization.
GO:0070062 extracellular exosome	HDA PMID:20458337 MHC class II-associated proteins in B-cell exosomes and pote...	KEEP AS NON CORE	Summary: PMID:20458337 identifies MHC class II-associated proteins in B-cell exosomes, including HSPA1B. Consistent with known exosomal release of HSP70 family members. Reason: High-throughput proteomics data. Exosomal localization is a secondary, non-core feature of HSPA1B.
GO:0070062 extracellular exosome	HDA PMID:23533145 In-depth proteomic analyses of exosomes isolated from expres...	KEEP AS NON CORE	Summary: PMID:23533145 identifies HSPA1B in exosomes isolated from expressed prostatic secretions in urine. Consistent with known exosomal HSP70 release from various cell types. Reason: High-throughput proteomics data. Exosomal localization is non-core.
GO:1990904 ribonucleoprotein complex	IDA PMID:17289661 Molecular composition of IMP1 ribonucleoprotein granules.	ACCEPT	Summary: PMID:17289661 identifies HSPA1B as a component of IGF2BP1 (IMP1) mRNP granules containing untranslated mRNAs by mass spectrometry. UniProt confirms this localization (ECO:0000269\|PubMed:17289661). Reason: Confirmed by mass spectrometry identification in mRNP granule complex. Consistent with known HSP70 association with RNA granules.
GO:0005515 protein binding	IPI PMID:24318877 Binding of human nucleotide exchange factors to heat shock p...	MARK AS OVER ANNOTATED	Summary: PMID:24318877 (Rauch and Gestwicki 2014) characterizes how binding of human nucleotide exchange factors (BAG1, BAG2, BAG3, HSPH1) to Hsp70 generates functionally distinct complexes. The protein binding annotation is uninformative for a chaperone with many specific co-chaperone interactions. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone. The specific interactions with NEFs are better captured by heat shock protein binding (GO:0031072) already annotated.
GO:0005515 protein binding	IPI PMID:27137183 HSP70 regulates the function of mitotic centrosomes.	MARK AS OVER ANNOTATED	Summary: PMID:27137183 shows HSP70 interacts with NEDD1 and gamma-tubulin at the mitotic centrosome. Protein binding is uninformative for a chaperone that interacts with many client proteins. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone. The specific NEDD1 interaction is in the context of centrosome function already captured by more specific annotations.
GO:0005515 protein binding	IPI PMID:27708256 ARD1-mediated Hsp70 acetylation balances stress-induced prot...	MARK AS OVER ANNOTATED	Summary: PMID:27708256 demonstrates specific interactions between Hsp70 and NAA10 (ARD1), HDAC4, HOPX, STUB1, HSP40, and HSP90 in the context of acetylation-regulated chaperone switching. Protein binding is uninformative for a chaperone with many well-characterized co-chaperone interactions. Reason: GO:0005515 protein binding is uninformative. The specific interactions with HDAC4, STUB1, HOPX etc. are better captured by more specific MF terms already annotated (e.g., histone deacetylase binding, ubiquitin protein ligase binding, heat shock protein binding).
GO:0005813 centrosome	IDA PMID:27137183 HSP70 regulates the function of mitotic centrosomes.	ACCEPT	Summary: PMID:27137183 directly demonstrates that HSP70 accumulates at the mitotic centrosome during prometaphase to metaphase by immunofluorescence. UniProt confirms this localization (ECO:0000269\|PubMed:27137183). Reason: Confirmed by direct assay showing centrosome accumulation during mitosis. HSP70 is required for centrosome integrity and bipolar spindle assembly. Supporting Evidence: PMID:27137183 heat shock protein (HSP) 70 considerably accumulates at the mitotic centrosome during prometaphase to metaphase and is required for bipolar spindle assembly
GO:0042026 protein refolding	IMP PMID:27708256 ARD1-mediated Hsp70 acetylation balances stress-induced prot...	ACCEPT	Summary: PMID:27708256 demonstrates that acetylated Hsp70 binds HOPX to facilitate protein refolding during the early stress response. K77R mutation impairs refolding capacity. Core biological process. Reason: Protein refolding is a core function of HSPA1B, confirmed by direct demonstration that the acetylation state regulates the refolding vs degradation switch. Supporting Evidence: PMID:27708256 During the early stress response, Hsp70 is immediately acetylated by ARD1 at K77, and the acetylated Hsp70 binds to the co-chaperone Hop to allow protein refolding
GO:0090063 positive regulation of microtubule nucleation	IMP PMID:27137183 HSP70 regulates the function of mitotic centrosomes.	KEEP AS NON CORE	Summary: PMID:27137183 demonstrates that inhibition or depletion of HSP70 impaired microtubule nucleation and polymerization from the spindle pole. HSP70 associates with NEDD1 and gamma-tubulin, two PCM components essential for MT nucleation. Reason: Experimentally well-supported centrosome-related function during mitosis but not a core chaperone function. Supporting Evidence: PMID:27137183 Inhibition or depletion of HSP70 impaired the function of mitotic centrosome and disrupted MT nucleation and polymerization from the spindle pole
GO:1901673 regulation of mitotic spindle assembly	IMP PMID:27137183 HSP70 regulates the function of mitotic centrosomes.	KEEP AS NON CORE	Summary: PMID:27137183 shows HSP70 is required for bipolar spindle assembly. Its inhibition disrupts spindle formation and may result in formation of abnormal mitotic spindles. Reason: Experimentally supported but represents a specific mitotic function rather than the core chaperone activity. Supporting Evidence: PMID:27137183 HSP70 is required for the maintenance of a functional mitotic centrosome that supports the assembly of a bipolar mitotic spindle
GO:0005576 extracellular region	TAS Reactome:R-HSA-6800434	KEEP AS NON CORE	Summary: TAS from Reactome R-HSA-6800434 (exocytosis of ficolin-rich granule lumen proteins) describing release of HSP70 into the extracellular space during neutrophil degranulation. HSP70 is known to be released extracellularly via exosomes and neutrophil granules. Reason: Extracellular localization is supported by Reactome and proteomics data but is a secondary, cell-type-specific feature.
GO:1904813 ficolin-1-rich granule lumen	TAS Reactome:R-HSA-6800434	KEEP AS NON CORE	Summary: TAS from Reactome R-HSA-6800434 describing HSP70 in ficolin-rich granule lumen of neutrophils. Cell-type-specific localization in neutrophils. Reason: Cell-type-specific localization in neutrophils, supported by Reactome but not a core localization for HSPA1B.
GO:0032757 positive regulation of interleukin-8 production	IMP PMID:24790089 The molecular chaperone HSP70 binds to and stabilizes NOD2, ...	KEEP AS NON CORE	Summary: PMID:24790089 shows induced HSP70 expression increases NOD2 response to bacterial cell wall fragments, which leads to NF-kappaB-dependent IL-8 production. HSP70 stabilizes NOD2 protein, enhancing its signaling capacity. Reason: Experimentally supported downstream consequence of HSP70 stabilization of NOD2, not a core chaperone function. Supporting Evidence: PMID:24790089 Induced HSP70 expression in cells increased the response of NOD2 to bacterial cell wall fragments
GO:0031396 regulation of protein ubiquitination	IDA PMID:16809764 Histone deacetylase 8 safeguards the human ever-shorter telo...	KEEP AS NON CORE	Summary: PMID:16809764 shows that phosphorylated HDAC8 recruits Hsp70 to a complex that inhibits CHIP E3 ligase-mediated degradation of hEST1B. HSP70 participates in regulating ubiquitination of client proteins through its interaction with CHIP/STUB1. Reason: Experimentally supported regulation of ubiquitination in the context of HDAC8-mediated hEST1B stabilization. This is a specific downstream consequence of HSP70 chaperone-E3 ligase interaction rather than core function. Supporting Evidence: PMID:16809764 Phosphorylated HDAC8 preferentially recruits Hsp70 to a complex that inhibits the CHIP (C-terminal heat shock protein interacting protein) E3 ligase-mediated degradation of hEST1B
GO:0042826 histone deacetylase binding	IPI PMID:16809764 Histone deacetylase 8 safeguards the human ever-shorter telo...	ACCEPT	Summary: PMID:16809764 confirms interaction between HSP70 and HDAC8. Phosphorylated HDAC8 recruits Hsp70 to a complex. UniProt also documents interaction with HDAC4 (PMID:27708256), which deacetylates Hsp70 at Lys-77 to regulate chaperone function. Reason: Confirmed by experimental evidence from multiple studies. HDAC binding is functionally relevant to regulation of HSP70 chaperone activity through acetylation/deacetylation of Lys-77. Supporting Evidence: PMID:16809764 Phosphorylated HDAC8 preferentially recruits Hsp70 to a complex that inhibits the CHIP (C-terminal heat shock protein interacting protein) E3 ligase-mediated degradation of hEST1B
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-3371467	ACCEPT	Summary: TAS from Reactome R-HSA-3371467 (SIRT1 deacetylates HSF1) describing HSP70 involvement in the nucleoplasm during HSF1-mediated heat shock response regulation. HSP70 shuttles to the nucleus during stress via Hikeshi-mediated import. Reason: Nucleoplasm localization is consistent with HSP70 nuclear functions during the heat shock response, particularly in HSF1 regulation.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-3371518	ACCEPT	Summary: TAS from Reactome R-HSA-3371518 (SIRT1 binds to HSF1) describing nucleoplasmic localization of HSP70 in the context of HSF1 regulation. Redundant with other nucleoplasm TAS annotations. Reason: Consistent with established HSP70 nuclear localization during stress.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-3371554	ACCEPT	Summary: TAS from Reactome R-HSA-3371554 (HSF1 acetylation at Lys80) describing nucleoplasmic localization of HSP70 during the heat shock response attenuation phase. Reason: Consistent with established HSP70 nuclear localization during stress and its role in HSF1 regulation.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-5082356	ACCEPT	Summary: TAS from Reactome R-HSA-5082356 (HSF1-mediated gene expression) describing nucleoplasmic localization of HSP70 during HSF1-dependent transactivation. HSP70 feeds back on HSF1 to attenuate the heat shock response. Reason: Consistent with nucleoplasmic localization during HSF1 regulation.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-5082369	ACCEPT	Summary: TAS from Reactome R-HSA-5082369 (acetylated HSF1 dissociates from DNA) describing HSP70 nucleoplasmic role in HSF1 attenuation. Reason: Consistent with established nucleoplasmic localization of HSP70 during stress response regulation.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-5082384	ACCEPT	Summary: TAS from Reactome R-HSA-5082384 (HSP70:DNAJB1 binds HSF1) describing HSP70 nucleoplasmic function in the attenuation phase of the heat shock response, where HSP70 with DNAJB1 binds to HSF1 to suppress transcription. Reason: Core nuclear function of HSP70 in regulating HSF1. This is a well-established feedback mechanism.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-5251955	ACCEPT	Summary: TAS from Reactome R-HSA-5251955 (HSP40s activate intrinsic ATPase activity of HSP70s in the nucleoplasm) describing nucleoplasmic HSP70 ATPase cycle driven by J-domain proteins. Reason: Consistent with HSP70 functioning in the nucleoplasm during stress.
GO:0005654 nucleoplasm	TAS Reactome:R-HSA-5252041	ACCEPT	Summary: TAS from Reactome R-HSA-5252041 (NPC transports Hikeshi:HSP70s:ATP from cytosol to nucleoplasm) describing Hikeshi-mediated nuclear import of HSP70 during heat shock. Reason: Consistent with the established Hikeshi-dependent HSP70 nuclear import mechanism under stress conditions.
GO:0005829 cytosol	TAS Reactome:R-HSA-3371422	ACCEPT	Summary: TAS from Reactome R-HSA-3371422 (ATP hydrolysis by HSP70) describing cytosolic HSP70 ATPase activity. Core localization for HSPA1B. Reason: Core localization. Cytosol is the primary site of HSP70 chaperone activity, consistent with IBA and IDA annotations.
GO:0005829 cytosol	TAS Reactome:R-HSA-3371503	ACCEPT	Summary: TAS from Reactome R-HSA-3371503 (STIP1/HOP binds HSP90 and HSP70:HSP40:nascent protein) describing cytosolic HSP70 in the HSP70-HSP90 chaperone relay. Reason: Core localization. Cytosolic HSP70-HSP90 relay is a well-established chaperone pathway.
GO:0005829 cytosol	TAS Reactome:R-HSA-3371590	ACCEPT	Summary: TAS from Reactome R-HSA-3371590 (HSP70 binds to HSP40:nascent protein) describing cytosolic HSP70 initial substrate engagement. Reason: Core localization. HSP70 engagement with HSP40-bound nascent proteins occurs in the cytosol.
GO:0005829 cytosol	TAS Reactome:R-HSA-5251942	ACCEPT	Summary: TAS from Reactome R-HSA-5251942 (Hikeshi binds HSP70s:ATP) describing cytosolic HSP70:ATP binding to Hikeshi for nuclear import during heat stress. Reason: Core localization. HSP70 is cytosolic prior to Hikeshi-mediated nuclear transport.
GO:0005829 cytosol	TAS Reactome:R-HSA-5251959	ACCEPT	Summary: TAS from Reactome R-HSA-5251959 (HSP40s activate intrinsic ATPase activity of HSP70s in the cytosol) describing cytosolic HSP70 ATPase cycle activation by J-domain proteins. Reason: Core localization. Cytosolic chaperone cycle activation is a central function of HSP70.
GO:0005829 cytosol	TAS Reactome:R-HSA-5252041	ACCEPT	Summary: TAS from Reactome R-HSA-5252041 (NPC transports Hikeshi:HSP70s:ATP from cytosol to nucleoplasm) describing cytosolic origin of HSP70 prior to nuclear import. Reason: Core localization. HSP70 is cytosolic prior to nuclear import.
GO:0005829 cytosol	TAS Reactome:R-HSA-5252079	ACCEPT	Summary: TAS from Reactome R-HSA-5252079 (HSP110s exchange ATP for ADP on HSP70s:ADP) describing cytosolic nucleotide exchange on HSP70 by HSP110 nucleotide exchange factors. Reason: Core localization. NEF-mediated nucleotide exchange occurs in the cytosol as part of the chaperone cycle.
GO:0005829 cytosol	TAS Reactome:R-HSA-5618085	ACCEPT	Summary: TAS from Reactome R-HSA-5618085 (FKBP4 binds HSP90:ATP:STIP1:HSP70: nascent protein) describing cytosolic HSP70 in the HSP90 chaperone cycle for steroid hormone receptors. Reason: Core localization. Cytosolic HSP70 participates in HSP90 chaperone relay for client protein maturation.
GO:0005829 cytosol	TAS Reactome:R-HSA-5618098	ACCEPT	Summary: TAS from Reactome R-HSA-5618098 (p23/PTGES3 binds HSP90:ATP:FKBP5: nascent protein) describing cytosolic localization of HSP70 during HSP90 chaperone cycle. Reason: Core localization in the cytosol during HSP90 chaperone cycle.
GO:0005829 cytosol	TAS Reactome:R-HSA-5618105	ACCEPT	Summary: TAS from Reactome R-HSA-5618105 (FKBP5 binds HSP90:ATP:STIP1:HSP70: nascent protein) describing cytosolic HSP70 in HSP90 chaperone cycle. Reason: Core localization in the cytosol.
GO:0005829 cytosol	TAS Reactome:R-HSA-5618107	ACCEPT	Summary: TAS from Reactome R-HSA-5618107 (ATP binding to HSP90 triggers conformation change) describing cytosolic localization of HSP70 in the context of HSP90 chaperone machinery. Reason: Core localization in the cytosol.
GO:0005829 cytosol	TAS Reactome:R-HSA-5618110	ACCEPT	Summary: TAS from Reactome R-HSA-5618110 (p23/PTGES3 binds HSP90:ATP:FKBP4: nascent protein) describing cytosolic localization of HSP70 during HSP90 chaperone cycle maturation steps. Reason: Core localization in the cytosol.
GO:0005829 cytosol	TAS Reactome:R-HSA-9835411	ACCEPT	Summary: TAS from Reactome R-HSA-9835411 (FA core complex:HSP70s binds PKR) describing cytosolic HSP70 involvement in PKR-mediated signaling. Reason: Core localization in the cytosol.
GO:0005829 cytosol	TAS Reactome:R-HSA-9857076	ACCEPT	Summary: TAS from Reactome R-HSA-9857076 (oxidized DNAJA1 binds HSPA1A,B displacing HSF1) describing cytosolic HSP70 involved in redox-sensitive HSF1 regulation. Reason: Core localization in the cytosol.
GO:0005515 protein binding	IPI PMID:22528486 Nucleophosmin (NPM1/B23) interacts with activating transcrip...	MARK AS OVER ANNOTATED	Summary: PMID:22528486 identifies HSP70 as an ATF5-interacting protein. NPM1 displaces HSP70 from ATF5, leading to ATF5 degradation. The HSP70-ATF5 interaction reflects chaperone client stabilization. Protein binding is uninformative for a chaperone. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone. The ATF5 interaction is a specific client stabilization function better captured by protein stabilization (GO:0050821) already annotated. Supporting Evidence: PMID:22528486 NPM1 interaction with ATF5 displaces HSP70, a known ATF5-interacting protein, from ATF5 protein complexes and antagonizes its role in stabilization of ATF5 protein
GO:0055131 C3HC4-type RING finger domain binding	IPI PMID:25281747 RING finger protein RNF207, a novel regulator of cardiac exc...	ACCEPT	Summary: PMID:25281747 demonstrates that coexpression of RNF207 and HSP70 increases HERG expression in a heat shock protein-dependent manner. RNF207 is a RING finger protein that interacts with HSP70 via its C-terminus. Reason: Confirmed by experimental evidence showing HSP70 interaction with the RING finger protein RNF207 to regulate HERG trafficking. Supporting Evidence: PMID:25281747 coexpression of RNF207 and HSP70 increased HERG expression compared with HSP70 alone. This effect was dependent on the C terminus of RNF207
GO:0031072 heat shock protein binding	IPI PMID:17182002 HDJC9, a novel human type C DnaJ/HSP40 member interacts with...	ACCEPT	Summary: PMID:17182002 shows DNAJC9 (HDJC9), a novel type C DnaJ/HSP40 member, interacts with and cochaperones HSP70 through the J domain. DNAJC9 activates the ATPase activity of HSP70. Reason: Core co-chaperone interaction. J-domain protein (DNAJC9) binding to HSP70 is fundamental to the chaperone cycle. Supporting Evidence: PMID:17182002 HDJC9 can interact with HSP70s and activate the ATPase activity of HSP70s, both of which are dependent on the J domain
GO:0001664 G protein-coupled receptor binding	IDA PMID:12150907 CHIP is associated with Parkin, a gene responsible for famil...	MARK AS OVER ANNOTATED	Summary: PMID:12150907 shows CHIP, Hsp70, Parkin, and unfolded Pael-R (an orphan GPCR) form a complex. Hsp70 binds Pael-R as a chaperone substrate, not as a GPCR signaling partner. Reason: While HSPA1B does bind the GPCR Pael-R, this is in the context of chaperone-substrate interaction for an unfolded receptor, not GPCR signaling. The term implies specific binding to GPCRs as signaling partners. Supporting Evidence: PMID:12150907 CHIP, Hsp70, Parkin, and Pael-R formed a complex in vitro and in vivo
GO:0031397 negative regulation of protein ubiquitination	IDA PMID:12150907 CHIP is associated with Parkin, a gene responsible for famil...	KEEP AS NON CORE	Summary: PMID:12150907 demonstrates that Hsp70 binding to Pael-R can shield the substrate from ubiquitination. CHIP promotes dissociation of Hsp70 from the complex, facilitating Parkin-mediated ubiquitination. HSP70 thus negatively regulates ubiquitination by sequestering substrates from E3 ligases. Reason: Experimentally supported but represents a context-dependent regulatory outcome of chaperone activity on substrate triage. Supporting Evidence: PMID:12150907 CHIP promoted the dissociation of Hsp70 from Parkin and Pael-R, thus facilitating Parkin-mediated Pael-R ubiquitination
GO:0031625 ubiquitin protein ligase binding	IPI PMID:12150907 CHIP is associated with Parkin, a gene responsible for famil...	ACCEPT	Summary: PMID:12150907 demonstrates that Hsp70 forms a complex with CHIP (an E3 ubiquitin ligase) and Parkin (an E3 ubiquitin ligase) in the context of Pael-R ubiquitination. HSP70 directly binds E3 ligases as part of its chaperone triage function. Reason: Core co-chaperone interaction. HSP70 binding to E3 ubiquitin ligases like CHIP/STUB1 and Parkin is integral to the protein quality control triage mechanism. Supporting Evidence: PMID:12150907 CHIP, Hsp70, Parkin, and Pael-R formed a complex in vitro and in vivo
GO:0034599 cellular response to oxidative stress	TAS PMID:24252804 The role of oxidative stress in Parkinson's disease.	KEEP AS NON CORE	Summary: TAS from PMID:24252804 (a review of the role of oxidative stress in Parkinson disease pathogenesis) supporting HSP70 involvement in oxidative stress response. HSP70 is induced by and participates in oxidative stress response. Reason: HSP70 is induced by and participates in oxidative stress response, but this is a general stress-responsive phenotype rather than a core chaperone function.
GO:0050821 protein stabilization	TAS PMID:24252804 The role of oxidative stress in Parkinson's disease.	ACCEPT	Summary: TAS from PMID:24252804 supporting HSP70 protein stabilization function in the context of Parkinson disease. HSP70 chaperone activity inherently stabilizes client proteins. PMID:24790089 directly demonstrates HSP70 stabilizes NOD2 by increasing its half-life. Reason: Well-supported core function. HSP70 chaperone activity inherently stabilizes client proteins, preventing misfolding and degradation.
GO:0051082 unfolded protein binding	NAS PMID:12150907 CHIP is associated with Parkin, a gene responsible for famil...	MODIFY	Summary: GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962). This NAS annotation references PMID:12150907 (Imai et al. 2002), which describes how CHIP, Hsp70, Parkin, and unfolded Pael receptor (Pael-R) form a complex involved in ER stress-related ubiquitination. The paper demonstrates that Hsp70 participates in a chaperone-E3 ligase complex facilitating ubiquitination of the unfolded substrate Pael-R, consistent with Hsp70 functioning as a protein folding chaperone that triages substrates between refolding and degradation pathways. HSPA1B is an ATP-dependent foldase chaperone and the correct replacement term is GO:0044183 (protein folding chaperone). Reason: GO:0051082 is being obsoleted. The referenced paper (PMID:12150907) describes Hsp70 participating in a complex with CHIP and Parkin for ubiquitination of unfolded Pael-R, which reflects Hsp70 chaperone triage function rather than simple unfolded protein binding. HSPA1B is an active ATP-dependent protein folding chaperone whose substrate binding is coupled to its ATPase cycle. GO:0044183 (protein folding chaperone) correctly captures the molecular function. Proposed replacements: protein folding chaperone Supporting Evidence: PMID:12150907 CHIP, Hsp70, Parkin, and Pael-R formed a complex in vitro and in vivo. The amount of CHIP in the complex was increased during ER stress. CHIP promoted the dissociation of Hsp70 from Parkin and Pael-R, thus facilitating Parkin-mediated Pael-R ubiquitination.
GO:0005814 centriole	IDA PMID:24061851 Stress-induced localization of HSPA6 (HSP70B') and HSPA1A (H...	ACCEPT	Summary: PMID:24061851 documents stress-induced localization of HSPA1A (functionally identical to HSPA1B) to centrioles in human neuronal cells. Consistent with HSP70 centrosome function during stress. Reason: Confirmed by direct assay showing stress-induced centriole localization in neuronal cells.
GO:0005829 cytosol	IDA PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	ACCEPT	Summary: PMID:21231916 (Hageman et al. 2011) characterized HSP70 family members in the cytosol, demonstrating cytosolic chaperone activities including luciferase refolding and polyQ aggregation suppression. Reason: Core localization confirmed by direct assay. Cytosol is the primary site of HSP70 chaperone function.
GO:0005925 focal adhesion	HDA PMID:21423176 Analysis of the myosin-II-responsive focal adhesion proteome...	KEEP AS NON CORE	Summary: PMID:21423176 is a proteomic analysis of the myosin-II-responsive focal adhesion proteome that identified HSPA1B among focal adhesion proteins. Reason: High-throughput proteomics data. Focal adhesion localization is a secondary, context-dependent feature, not a core localization for HSP70.
GO:0031072 heat shock protein binding	IPI PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	ACCEPT	Summary: PMID:21231916 demonstrates functional interactions between HSP70 family members and various J-domain protein co-chaperones (HSP40s). HSPA1A ATPase activity is stimulated by J-proteins. Reason: Core co-chaperone interaction. HSP70-HSP40 (J-protein) interactions are fundamental to the chaperone cycle. Supporting Evidence: PMID:21231916 HSPA6 has a functional substrate-binding domain and possesses intrinsic ATPase activity that is as high as that of the canonical HSPA1A when stimulated by J-proteins
GO:0034605 cellular response to heat	IDA PMID:24061851 Stress-induced localization of HSPA6 (HSP70B') and HSPA1A (H...	ACCEPT	Summary: PMID:24061851 demonstrates stress-induced localization changes of HSPA1A to centrioles in human neuronal cells, showing a direct cellular response to heat stress. Reason: Core stress-response function. HSPA1B is heat-inducible and directly responds to heat stress by changing its subcellular localization and activity.
GO:0042026 protein refolding	IDA PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	ACCEPT	Summary: PMID:21231916 directly demonstrates that HSPA1A (functionally identical to HSPA1B) supports luciferase refolding after heat denaturation. Core biological process for HSP70. Reason: Core biological process confirmed by direct assay showing heat-denatured luciferase refolding activity. Supporting Evidence: PMID:21231916 Overexpressed chaperones that suppressed polyQ aggregation were found not to be able to stimulate luciferase refolding. Inversely, chaperones that supported luciferase refolding were poor suppressors of polyQ aggregation
GO:0051082 unfolded protein binding	IDA PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	MODIFY	Summary: GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962). This IDA annotation references PMID:21231916 (Hageman et al. 2011), a key study that systematically compared chaperone activities of mammalian HSP70 family members. The study demonstrated that HSPA1A (>99% identical to HSPA1B) possesses robust luciferase refolding activity and protects cells from heat-induced cell death. While the study does demonstrate that HSPA1A/HSPA1B can bind heat-denatured substrates, this binding is intrinsically coupled to the ATP-dependent chaperone folding cycle. The correct molecular function term is GO:0044183 (protein folding chaperone), which captures the active chaperone function rather than the passive substrate-binding aspect that GO:0051082 implies. Reason: GO:0051082 is being obsoleted. PMID:21231916 directly demonstrates that HSPA1A (functionally identical to HSPA1B) is an active ATP-dependent foldase that refolds heat-denatured luciferase and suppresses protein aggregation. The binding of unfolded substrates by HSP70 is mechanistically inseparable from its chaperone folding cycle. GO:0044183 (protein folding chaperone) is the correct replacement and is already annotated to HSPA1B via IDA (PMID:15603737) and IBA (GO_REF:0000033) evidence. Proposed replacements: protein folding chaperone Supporting Evidence: PMID:21231916 HSPA6 has a functional substrate-binding domain and possesses intrinsic ATPase activity that is as high as that of the canonical HSPA1A when stimulated by J-proteins. PMID:21231916 whereas overexpression of HSPA1A protected cells from heat-induced cell death, overexpression of HSPA6 did not
GO:0070370 cellular heat acclimation	IMP PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	ACCEPT	Summary: PMID:21231916 confirms that HSPA1A (functionally identical to HSPA1B) protects cells from heat-induced cell death. Overexpression of HSPA1A conferred thermotolerance whereas HSPA6 did not. Reason: Core stress-response function. HSPA1B is heat-inducible and protects cells during heat stress, directly contributing to cellular heat acclimation. Supporting Evidence: PMID:21231916 whereas overexpression of HSPA1A protected cells from heat-induced cell death, overexpression of HSPA6 did not
GO:0072562 blood microparticle	HDA PMID:22516433 Proteomic analysis of microvesicles from plasma of healthy d...	KEEP AS NON CORE	Summary: PMID:22516433 is a proteomic analysis of microvesicles from plasma of healthy donors identifying HSPA1B among blood microparticle proteins. Consistent with known extracellular release of HSP70. Reason: High-throughput proteomics data. Blood microparticle localization is a secondary, non-core feature consistent with extracellular HSP70 release.
GO:0090084 negative regulation of inclusion body assembly	IDA PMID:21231916 The diverse members of the mammalian HSP70 machine show dist...	ACCEPT	Summary: PMID:21231916 demonstrates that HSPA1A (functionally identical to HSPA1B) suppresses polyQ aggregation and inclusion body formation. Core protein quality control function. Reason: Core chaperone function. Preventing protein aggregation and inclusion body formation is a direct consequence of HSP70 foldase and holdase activity.
GO:0005515 protein binding	IPI PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	MARK AS OVER ANNOTATED	Summary: PMID:15603737 shows BAG5 directly interacts with Hsp70 and inhibits Hsp70-mediated refolding of misfolded proteins. Protein binding is uninformative for a chaperone. Reason: GO:0005515 protein binding is uninformative for a molecular chaperone. The BAG5 interaction is a specific co-chaperone interaction better captured by heat shock protein binding (GO:0031072). Supporting Evidence: PMID:15603737 bcl-2-associated athanogene 5 (BAG5), a BAG family member, directly interacts with parkin and the chaperone Hsp70. Within this complex, BAG5 inhibits both parkin E3 ubiquitin ligase activity and Hsp70-mediated refolding of misfolded proteins
GO:0005524 ATP binding	IDA PMID:23921388 Identification and characterization of a novel human methylt...	ACCEPT	Summary: PMID:23921388 characterizes METTL21A methylation of HSP70, with the methylation reaction stimulated by ATP, demonstrating HSP70 ATP binding. Core molecular function confirmed by crystal structures of the NBD domain with ADP/ATP. Reason: Core molecular function. ATP binding drives the chaperone cycle and is essential for all HSP70 functions. Supporting Evidence: PMID:23921388 the reaction was stimulated by ATP
GO:0010628 positive regulation of gene expression	IMP PMID:25281747 RING finger protein RNF207, a novel regulator of cardiac exc...	KEEP AS NON CORE	Summary: PMID:25281747 shows that coexpression of RNF207 and HSP70 increased HERG expression, suggesting HSP70 participates in positive regulation of gene expression for specific client proteins through its chaperone activity on trafficking. Reason: Experimentally supported but a downstream consequence of HSP70 chaperone-mediated protein trafficking/stabilization in the cardiac context, not a core gene expression regulatory function. Supporting Evidence: PMID:25281747 coexpression of RNF207 and HSP70 increased HERG expression compared with HSP70 alone
GO:0016234 inclusion body	IDA PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	ACCEPT	Summary: PMID:15603737 shows BAG5 enhances parkin sequestration within protein aggregates, with HSP70 localized to inclusion bodies as part of its protein quality control response. Reason: Confirmed by direct assay. HSP70 localizes to inclusion bodies as part of its role in protein aggregate management and quality control. Supporting Evidence: PMID:15603737 BAG5 enhances parkin sequestration within protein aggregates and mitigates parkin-dependent preservation of proteasome function
GO:0019899 enzyme binding	IPI PMID:23921388 Identification and characterization of a novel human methylt...	ACCEPT	Summary: PMID:23921388 demonstrates METTL21A (HSPA-KMT) is a highly specific methyltransferase that interacts with and methylates HSP70 family members. Enzyme binding is confirmed by the direct enzyme-substrate interaction. Reason: Confirmed by experimental evidence. METTL21A is a specific enzyme that binds and modifies HSP70 at Lys-561. Supporting Evidence: PMID:23921388 we identified the methyltransferase METTL21A as the enzyme responsible for trimethylation of a conserved lysine residue found in several human Hsp70 (HSPA) proteins
GO:0031072 heat shock protein binding	IPI PMID:23921388 Identification and characterization of a novel human methylt...	ACCEPT	Summary: PMID:23921388 demonstrates that METTL21A trimethylation alters the affinity of Hsp70 for alpha-synuclein fibrils, reflecting functionally relevant HSP-HSP interactions. The study also shows METTL21A interacts with HSP70 family members. Reason: Core co-chaperone interaction. HSP70 binding to other heat shock proteins and modifiers is fundamental to chaperone regulation.
GO:0031625 ubiquitin protein ligase binding	IPI PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	ACCEPT	Summary: PMID:15603737 demonstrates that BAG5 directly interacts with both parkin (an E3 ubiquitin ligase) and Hsp70, forming a complex. HSP70 binding to E3 ligases is a core part of the chaperone triage system. Reason: Core co-chaperone interaction. HSP70 binding to E3 ubiquitin ligases like Parkin is integral to the protein quality control triage mechanism. Supporting Evidence: PMID:15603737 bcl-2-associated athanogene 5 (BAG5), a BAG family member, directly interacts with parkin and the chaperone Hsp70
GO:0042026 protein refolding	IDA PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	ACCEPT	Summary: PMID:15603737 demonstrates Hsp70-mediated refolding of misfolded proteins, which is inhibited by BAG5. Core biological process for HSP70. Reason: Core biological process confirmed by direct assay. HSP70 refolds misfolded proteins through its ATP-dependent chaperone cycle. Supporting Evidence: PMID:15603737 BAG5 inhibits both parkin E3 ubiquitin ligase activity and Hsp70-mediated refolding of misfolded proteins
GO:0044183 protein folding chaperone	IDA PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	ACCEPT	Summary: PMID:15603737 demonstrates Hsp70 chaperone activity in the context of the BAG5-Parkin-Hsp70 complex. Hsp70 actively refolds misfolded proteins. This is the core molecular function annotation for HSPA1B. Reason: The defining molecular function of HSPA1B. HSP70 is an ATP-dependent protein folding chaperone confirmed by direct assay. Supporting Evidence: PMID:15603737 BAG5 inhibits both parkin E3 ubiquitin ligase activity and Hsp70-mediated refolding of misfolded proteins
GO:0046034 ATP metabolic process	IDA PMID:23921388 Identification and characterization of a novel human methylt...	ACCEPT	Summary: PMID:23921388 confirms ATP-dependent activity of HSP70 in the context of METTL21A methylation studies. HSP70 hydrolyzes ATP as part of its chaperone cycle. Reason: Core function. ATP metabolic process is an inherent aspect of the ATPase-driven chaperone cycle.
GO:0048471 perinuclear region of cytoplasm	IDA PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	ACCEPT	Summary: PMID:15603737 documents perinuclear localization of HSP70 in the context of dopaminergic neuron studies with BAG5 and Parkin. Consistent with perinuclear HSP70 localization during stress. Reason: Confirmed by direct assay. Perinuclear localization is observed particularly in the context of protein quality control near the nucleus.
GO:0090084 negative regulation of inclusion body assembly	IDA PMID:15603737 BAG5 inhibits parkin and enhances dopaminergic neuron degene...	ACCEPT	Summary: PMID:15603737 shows HSP70 suppresses protein aggregation and inclusion body formation, which is inhibited by BAG5. Core protein quality control function. Reason: Core chaperone function. Preventing protein aggregation and inclusion body formation is a direct consequence of HSP70 foldase activity.
GO:2001240 negative regulation of extrinsic apoptotic signaling pathway in absence of ligand	IMP PMID:17167422 Hsp70 regulates erythropoiesis by preventing caspase-3-media...	KEEP AS NON CORE	Summary: PMID:17167422 shows Hsp70 protects GATA-1 from caspase-3 cleavage, preventing apoptosis during erythroid differentiation. This is a specific anti-apoptotic function mediated through chaperone protection of GATA-1. Reason: Experimentally supported anti-apoptotic function but represents a specific downstream effect of HSP70 chaperone-mediated protection of client proteins from caspase cleavage.
GO:0005102 signaling receptor binding	IPI PMID:24790089 The molecular chaperone HSP70 binds to and stabilizes NOD2, ...	KEEP AS NON CORE	Summary: PMID:24790089 demonstrates HSP70 binds NOD2, an intracellular pattern recognition receptor. This interaction stabilizes NOD2 and enhances its signaling capacity. Reason: Experimentally supported but reflects chaperone-client stabilization of NOD2 rather than specific signaling receptor binding activity. The interaction is in the context of HSP70 chaperone function. Supporting Evidence: PMID:24790089 We identified heat shock protein 70 (HSP70) as a protein interactor of both wild type and Crohn mutant NOD2
GO:0005737 cytoplasm	IDA PMID:24790089 The molecular chaperone HSP70 binds to and stabilizes NOD2, ...	ACCEPT	Summary: PMID:24790089 documents cytoplasmic localization of HSP70 in the context of NOD2 interaction studies. Core localization for HSPA1B. Reason: Core localization confirmed by direct assay.
GO:1903265 positive regulation of tumor necrosis factor-mediated signaling pathway	IMP PMID:24790089 The molecular chaperone HSP70 binds to and stabilizes NOD2, ...	KEEP AS NON CORE	Summary: PMID:24790089 shows HSP70 stabilizes NOD2, enhancing NOD2-mediated signaling which includes TNF-mediated pathway activation in response to bacterial cell wall fragments. Reason: Experimentally supported downstream effect of HSP70 chaperone activity on innate immune signaling components through NOD2 stabilization. Supporting Evidence: PMID:24790089 Induced HSP70 expression in cells increased the response of NOD2 to bacterial cell wall fragments

Core Functions

ATP-dependent foldase chaperone that assists folding of newly synthesized polypeptides and refolding of stress-denatured proteins. HSPA1B has the conserved tripartite HSP70 architecture: the N-terminal NBD binds and hydrolyzes ATP, allosterically driving an open-to-closed conformational transition of the SBD lid that regulates client binding and release (DOI:10.3390/biom13020272). HSP40/DNAJ co-chaperones stimulate ATP hydrolysis and deliver substrates, while nucleotide exchange factors (BAG1/2/3, HSPH1/HSP110) accelerate ADP-to-ATP exchange to trigger client release (DOI:10.3390/biom13020272). HSPA1B triages substrates between refolding (via HOPX/STIP1 co-chaperone) and proteasomal degradation (via STUB1/CHIP E3 ubiquitin ligase), with the acetylation state of Lys-77 governing this switch. Under stress, expression can reach approximately 15% of total cellular protein (DOI:10.3390/biom13020272). HSP70 cooperates with HSP90 in client maturation pathways and also participates in disaggregation of protein aggregates through cooperation with HSP110 as a disaggregase NEF (DOI:10.3390/biom13020272).

Molecular Function:

protein folding chaperone

Directly Involved In:

protein refolding positive regulation of proteasomal ubiquitin-dependent protein catabolic process cellular heat acclimation negative regulation of inclusion body assembly

Cellular Locations:

cytosol nucleus

Works with co-chaperones (notably HSP110/HSPH1 and DNAJB1) to solubilize and disaggregate ordered protein aggregates, including alpha-synuclein fibrils. This disaggregase activity is driven by the same ATP hydrolysis cycle as the foldase function but is directed toward pre-formed aggregates rather than nascent or stress-denatured monomers. Recent reviews position HSP110-family proteins as major NEFs/co-chaperones that cooperate with HSP70 and HSP40 to disaggregate and refold denatured proteins (DOI:10.3390/biom13040604).

Molecular Function:

ATP-dependent protein disaggregase activity

Directly Involved In:

negative regulation of inclusion body assembly

Cellular Locations:

cytosol

References

GO_REF:0000033

Annotation inferences using phylogenetic trees

GO_REF:0000043

Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping

GO_REF:0000044

Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location vocabulary mapping, accompanied by conservative changes to GO terms applied by UniProt

GO_REF:0000052

Gene Ontology annotation based on curation of immunofluorescence data

GO_REF:0000108

Automatic assignment of GO terms using logical inference, based on on inter-ontology links

GO_REF:0000117

Electronic Gene Ontology annotations created by ARBA machine learning models

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:10205060

Control of mRNA decay by heat shock-ubiquitin-proteasome pathway.

PMID:10859165

Chaperone hsp27 inhibits translation during heat shock by binding eIF4G and facilitating dissociation of cap-initiation complexes.

PMID:12150907

CHIP is associated with Parkin, a gene responsible for familial Parkinson's disease, and enhances its ubiquitin ligase activity.

PMID:15603737

BAG5 inhibits parkin and enhances dopaminergic neuron degeneration.

PMID:15671022

Heat shock protein 70 inhibits alpha-synuclein fibril formation via preferential binding to prefibrillar species.

PMID:15885686

TRIM37 defective in mulibrey nanism is a novel RING finger ubiquitin E3 ligase.

PMID:16130169

Proteomics of human umbilical vein endothelial cells applied to etoposide-induced apoptosis.

PMID:16809764

Histone deacetylase 8 safeguards the human ever-shorter telomeres 1B (hEST1B) protein from ubiquitin-mediated degradation.

PMID:17167422

Hsp70 regulates erythropoiesis by preventing caspase-3-mediated cleavage of GATA-1.

PMID:17182002

HDJC9, a novel human type C DnaJ/HSP40 member interacts with and cochaperones HSP70 through the J domain.

PMID:17289661

Molecular composition of IMP1 ribonucleoprotein granules.

PMID:18975920

Interactions between Hsp70 and the hydrophobic core of alpha-synuclein inhibit fibril assembly.

PMID:19190083

Characterization of exosome-like vesicles released from human tracheobronchial ciliated epithelium: a possible role in innate defense.

PMID:19199708

Proteomic analysis of human parotid gland exosomes by multidimensional protein identification technology (MudPIT).

PMID:20458337

MHC class II-associated proteins in B-cell exosomes and potential functional implications for exosome biogenesis.

PMID:21081504

ChChd3, an inner mitochondrial membrane protein, is essential for maintaining crista integrity and mitochondrial function.

PMID:21231916

The diverse members of the mammalian HSP70 machine show distinct chaperone-like activities.

PMID:21423176

Analysis of the myosin-II-responsive focal adhesion proteome reveals a role for β-Pix in negative regulation of focal adhesion maturation.

PMID:22516433

Proteomic analysis of microvesicles from plasma of healthy donors reveals high individual variability.

PMID:22528486

Nucleophosmin (NPM1/B23) interacts with activating transcription factor 5 (ATF5) protein and promotes proteasome- and caspase-dependent ATF5 degradation in hepatocellular carcinoma cells.

PMID:22658674

Insights into RNA biology from an atlas of mammalian mRNA-binding proteins.

PMID:22681889

The mRNA-bound proteome and its global occupancy profile on protein-coding transcripts.

PMID:23349634

A newly uncovered group of distantly related lysine methyltransferases preferentially interact with molecular chaperones to regulate their activity.

PMID:23533145

In-depth proteomic analyses of exosomes isolated from expressed prostatic secretions in urine.

PMID:23921388

Identification and characterization of a novel human methyltransferase modulating Hsp70 protein function through lysine methylation.

PMID:24061851

Stress-induced localization of HSPA6 (HSP70B') and HSPA1A (HSP70-1) proteins to centrioles in human neuronal cells.

PMID:24252804

The role of oxidative stress in Parkinson's disease.

PMID:24318877

Binding of human nucleotide exchange factors to heat shock protein 70 (Hsp70) generates functionally distinct complexes in vitro.

PMID:24790089

The molecular chaperone HSP70 binds to and stabilizes NOD2, an important protein involved in Crohn disease.

PMID:25281747

RING finger protein RNF207, a novel regulator of cardiac excitation.

PMID:27133716

A novel nuclear DnaJ protein, DNAJC8, can suppress the formation of spinocerebellar ataxia 3 polyglutamine aggregation in a J-domain independent manner.

PMID:27137183

HSP70 regulates the function of mitotic centrosomes.

PMID:27708256

ARD1-mediated Hsp70 acetylation balances stress-induced protein refolding and degradation.

PMID:28298427

Systematic protein-protein interaction mapping for clinically relevant human GPCRs.

PMID:33857403

DNAJC9 integrates heat shock molecular chaperones into the histone chaperone network.

PMID:9553041

Inhibition of cellular proliferation by the Wilms tumor suppressor WT1 requires association with the inducible chaperone Hsp70.

Reactome:R-HSA-3371422

ATP hydrolysis by HSP70

Reactome:R-HSA-3371467

SIRT1 deacetylates HSF1

Reactome:R-HSA-3371497

HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence of ligand

Reactome:R-HSA-3371503

STIP1(HOP) binds HSP90 and HSP70:HSP40:nascent protein

Reactome:R-HSA-3371518

SIRT1 binds to HSF1

Reactome:R-HSA-3371554

HSF1 acetylation at Lys80

Reactome:R-HSA-3371590

HSP70 binds to HSP40:nascent protein

Reactome:R-HSA-5082356

HSF1-mediated gene expression

Reactome:R-HSA-5082369

Acetylated HSF1 dissociates from DNA

Reactome:R-HSA-5082384

HSP70:DNAJB1 binds HSF1

Reactome:R-HSA-5251942

Hikeshi binds HSP70s:ATP

Reactome:R-HSA-5251955

HSP40s activate intrinsic ATPase activity of HSP70s in the nucleoplasm

Reactome:R-HSA-5251959

HSP40s activate intrinsic ATPase activity of HSP70s in the cytosol

Reactome:R-HSA-5252041

NPC transports Hikeshi:HSP70s:ATP from cytosol to nucleoplasm

Reactome:R-HSA-5252079

HSP110s exchange ATP for ADP on HSP70s:ADP

Reactome:R-HSA-5618085

FKBP4 binds HSP90:ATP:STIP1:HSP70:nascent protein

Reactome:R-HSA-5618098

p23 (PTGES3) binds HSP90:ATP:FKBP5:nascent protein

Reactome:R-HSA-5618105

FKBP5 binds HSP90:ATP:STIP1:HSP70:nascent protein

Reactome:R-HSA-5618107

ATP binding to HSP90 triggers conformation change

Reactome:R-HSA-5618110

p23 (PTGES3) binds HSP90:ATP:FKBP4:nascent protein

Reactome:R-HSA-6800434

Exocytosis of ficolin-rich granule lumen proteins

Reactome:R-HSA-9835411

FA core complex:HSP70s binds PKR

Reactome:R-HSA-9857076

Oxidized DNAJA1 binds HSPA1A,B (HSP70) displacing HSF1

DOI:10.3390/biom13020272

HSP70 and Primary Arterial Hypertension

Comprehensive review of HSP70 domain architecture (NBD, SBD, C-terminal tail), co-chaperone dependence (HSP40/DnaJ, HSP90), and role in proteostasis and stress adaptation. Notes stress-induced HSP70 expression can reach up to 15% of cellular protein.

DOI:10.3389/fonc.2024.1388999

Diversity of extracellular HSP70 in cancer - advancing from a molecular biomarker to a novel therapeutic target

HSPA1B is among HSP70 family members reported on the plasma membrane and in exosomes. Extracellular HSP70 can be actively trafficked through secretory granules, ABC transporter-mediated endolysosomal translocation, and exosome/ ectosome release. Membrane association involves phosphatidylserine binding, oligomerization, and enrichment in lipid rafts.

DOI:10.3390/biom13040604

Is It Still Possible to Think about HSP70 as a Therapeutic Target in Onco-Hematological Diseases?

Reviews membrane-localized HSP70 exposing the TKD epitope (aa450-461) detectable by cmHSP70.1 antibody. Notes that HSP70 inhibitors have not reached the clinic despite extensive preclinical work. HSP110-family proteins cooperate with HSP70 and HSP40 in disaggregation.

📚 Additional Documentation

Deep Research Falcon

(HSPA1B-deep-research-falcon.md)

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organism: human
gene_id: HSPA1B
gene_symbol: HSPA1B
uniprot_accession: P0DMV9
protein_description: 'RecName: Full=Heat shock 70 kDa protein 1B {ECO:0000312|HGNC:HGNC:5233};
AltName: Full=Heat shock 70 kDa protein 2; Short=HSP70-2 {ECO:0000303|PubMed:14656967,
ECO:0000303|PubMed:2538825}; Short=HSP70.2; AltName: Full=Heat shock protein family
A member 1B;'
gene_info: Name=HSPA1B {ECO:0000312|HGNC:HGNC:5233}; Synonyms=HSP72 {ECO:0000303|PubMed:24318877};
organism_full: Homo sapiens (Human).
protein_family: Belongs to the heat shock protein 70 family. .
protein_domains: ATPase_NBD. (IPR043129); Heat_shock_70_CS. (IPR018181); HSP70_C_sf.
(IPR029048); HSP70_peptide-bd_sf. (IPR029047); Hsp_70_fam. (IPR013126)
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

UniProt Accession: P0DMV9
Protein Description: RecName: Full=Heat shock 70 kDa protein 1B {ECO:0000312|HGNC:HGNC:5233}; AltName: Full=Heat shock 70 kDa protein 2; Short=HSP70-2 {ECO:0000303|PubMed:14656967, ECO:0000303|PubMed:2538825}; Short=HSP70.2; AltName: Full=Heat shock protein family A member 1B;
Gene Information: Name=HSPA1B {ECO:0000312|HGNC:HGNC:5233}; Synonyms=HSP72 {ECO:0000303|PubMed:24318877};
Organism (full): Homo sapiens (Human).
Protein Family: Belongs to the heat shock protein 70 family. .
Key Domains: ATPase_NBD. (IPR043129); Heat_shock_70_CS. (IPR018181); HSP70_C_sf. (IPR029048); HSP70_peptide-bd_sf. (IPR029047); Hsp_70_fam. (IPR013126)

MANDATORY VERIFICATION STEPS:

Check if the gene symbol "HSPA1B" matches the protein description above
Verify the organism is correct: Homo sapiens (Human).
Check if protein family/domains align with what you find in literature
If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'HSPA1B' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene HSPA1B (gene ID: HSPA1B, UniProt: P0DMV9) in human.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

UniProt Accession: P0DMV9
Protein Description: RecName: Full=Heat shock 70 kDa protein 1B {ECO:0000312|HGNC:HGNC:5233}; AltName: Full=Heat shock 70 kDa protein 2; Short=HSP70-2 {ECO:0000303|PubMed:14656967, ECO:0000303|PubMed:2538825}; Short=HSP70.2; AltName: Full=Heat shock protein family A member 1B;
Gene Information: Name=HSPA1B {ECO:0000312|HGNC:HGNC:5233}; Synonyms=HSP72 {ECO:0000303|PubMed:24318877};
Organism (full): Homo sapiens (Human).
Protein Family: Belongs to the heat shock protein 70 family. .
Key Domains: ATPase_NBD. (IPR043129); Heat_shock_70_CS. (IPR018181); HSP70_C_sf. (IPR029048); HSP70_peptide-bd_sf. (IPR029047); Hsp_70_fam. (IPR013126)

MANDATORY VERIFICATION STEPS:

Check if the gene symbol "HSPA1B" matches the protein description above
Verify the organism is correct: Homo sapiens (Human).
Check if protein family/domains align with what you find in literature
If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

Research Target:

Please provide a comprehensive research report on the gene HSPA1B (gene ID: HSPA1B, UniProt: P0DMV9) in human.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Title: Functional Annotation Research Report — Human HSPA1B (HSP70-2; UniProt P0DMV9)

Publication focus: 2023–2024 (with limited supplementation from 2025 where necessary for general Hsp70 background).

Target identity verification (critical disambiguation)

1.1. Gene/protein and organism
HSPA1B is the human (Homo sapiens) stress-inducible HSP70-family member commonly referred to as “HSP70-2”. A 2023 review tabulates HSPA1B as “HSP70-2”, localized to cytosol/nucleus (and also described as present in exosomes) and located at 6p21.3, alongside the closely related paralogs HSPA1A (“HSP70-1”) and HSPA1L (“HSP70-1L”). https://doi.org/10.3390/biom13040604 (published Mar 2023) (mouawad2023isitstill pages 2-4)

A separate 2023 source explicitly lists HspA1B (Heat shock 70 kDa protein 1B) with UniProt accession P0DMV9, and differentiates related family members HspA1A (P0DMV8) and HspA1L (P34931). This supports that the UniProt target in the prompt (P0DMV9) corresponds to HSPA1B. (grey2023theregulationof pages 105-108)

1.2. Practical implication for literature use
A recurrent issue in the literature is isoform ambiguity: many papers refer generically to “HSP70/Hsp70/HSP72” without resolving HSPA1A vs HSPA1B, and some mechanistic findings (especially on extracellular HSP70) likely apply to multiple inducible HSP70 paralogs rather than uniquely to HSPA1B. Where the evidence is isoform-explicit, this report labels it as HSPA1B-specific; otherwise, it is described as “inducible HSP70 family” evidence. (mouawad2023isitstill pages 2-4, rodrigueziturbe2023hsp70andprimary pages 1-2)

Key concepts, definitions, and current mechanistic understanding

2.1. Molecular function: ATP-dependent molecular chaperone
HSPA1B belongs to the HSP70 family of molecular chaperones. Core function is maintenance of proteostasis via binding to exposed hydrophobic segments of client proteins and supporting folding/refolding and quality control. A 2023 review describes HspA1A and HspA1B as major stress-inducible HSP70s and places them within a broader HSP70 family that supports protein homeostasis and stress adaptation. https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

2.2. Domain architecture (functional definition of “HSP70”)
Authoritative 2023–2024 reviews describe the conserved HSP70 architecture as:
• N-terminal nucleotide-binding domain (NBD; ATPase) that binds and hydrolyzes ATP
• C-terminal substrate-binding domain (SBD) that engages client polypeptides
• C-terminal tail that mediates co-chaperone interactions (e.g., with BAG proteins).
This tripartite organization is explicitly summarized in a 2023 review. https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

A 2024 cancer-focused review similarly summarizes HSP70 as having an N-terminal NBD and a C-terminal SBD underpinning its chaperone function. https://doi.org/10.3389/fonc.2024.1388999 (published Apr 2024) (hu2024diversityofextracellular pages 1-2)

2.3. Chaperone cycle and co-chaperone dependence
Inducible HSP70 activity is described as ATP-dependent and strongly co-chaperone-dependent:
• HSP40/DnaJ co-chaperones stimulate HSP70 ATP hydrolysis and assist substrate recognition/processing.
• HSP70 cooperates with HSP90 in client maturation pathways.
These mechanistic concepts are described in a 2023 review of HSP70 in hypertension and immunity. https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

2.4. Subcellular localization under basal vs stress conditions
Intracellular localization: HSPA1B is described as a cytosolic/nuclear inducible HSP70, while the broader family spans cytosol, nucleus, mitochondria, and ER. https://doi.org/10.3390/biom13040604 (published Mar 2023) (mouawad2023isitstill pages 2-4)

Stress response magnitude: A 2023 review notes that stress-induced HSP70 expression can rise to extremely high levels, reported up to ~15% of cellular protein under stress. https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

Recent developments (2023–2024) and latest research emphasis

3.1. Extracellular HSP70 (eHSP70) diversity and trafficking (2024 synthesis)
A major 2024 review advances the concept that HSP70 (including HSPA1B among the membrane/exosomal HSP70s) is not restricted to intracellular compartments: it can appear on the plasma membrane or be released extracellularly as free soluble protein and/or within extracellular vesicles (EVs), including exosomes. The review explicitly lists HSPA1B among HSP70 family members reported on the plasma membrane and in exosomes. https://doi.org/10.3389/fonc.2024.1388999 (published Apr 2024) (hu2024diversityofextracellular pages 1-2)

Mechanistic features highlighted in 2024 include:
• Membrane insertion and affinity for negatively charged phospholipids, especially phosphatidylserine (PS)
• Oligomerization coupled to PS binding, facilitating membrane association
• Enrichment in lipid rafts and interaction with globotriaosylceramide (Gb3)
These are described in the 2024 review, providing a current conceptual model for membrane HSP70 biology in cancer contexts. https://doi.org/10.3389/fonc.2024.1388999 (published Apr 2024) (hu2024diversityofextracellular pages 1-2)

3.2. Active secretion routes and EV pathways; PTM/oligomerization as determinants
The same 2024 review emphasizes that extracellular appearance is often active (non-classical secretion), citing multiple routes:
• Export via secretory-like granules
• Translocation into endolysosomes via ATP-binding cassette (ABC) transporters followed by fusion with the plasma membrane
• Release via exocytosis of exosomes or plasma-membrane budding (ectosomes)
It also notes that post-translational modifications (PTMs) and oligomerization can influence HSP70 loading into exosomes. https://doi.org/10.3389/fonc.2024.1388999 (published Apr 2024) (hu2024diversityofextracellular pages 2-4)

Figure-based evidence: A graphical summary figure from this 2024 review schematizes the three major extracellular states of HSP70 (membrane-associated, EV-associated, soluble) and the secretion/translocation pathways described above. (hu2024diversityofextracellular media 859e9929)

3.3. Cell-surface epitope and antibody-based detectability (2023 synthesis)
A 2023 onco-hematology review highlights an operationally important concept: membrane-localized inducible HSP70 exposes a defined extracellular peptide epitope (“TKD”, sequence TKDNNLLGRFELSG; aa450–461) detectable by the monoclonal antibody cmHSP70.1. This supports real-world measurement strategies for membrane HSP70 positivity (often discussed at the inducible HSP70 level, not always isoform-resolved). https://doi.org/10.3390/biom13040604 (published Mar 2023) (mouawad2023isitstill pages 2-4)

Biological processes, pathways, and functional roles (evidence-weighted)

4.1. Proteostasis and stress adaptation
Inducible HSP70 proteins (including HSPA1B) are positioned as central stress-response effectors supporting refolding of damaged proteins and preventing aggregation, with downstream consequences for survival under physiological and environmental stress. https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

4.2. Apoptosis and inflammatory signaling modulation
A 2023 review summarizes that HSP70 induction can inhibit apoptosis and suppress inflammatory pathways, including inhibition of Bax mitochondrial translocation as an example mechanism in anti-apoptotic activity (presented at the inducible HSP70 level). https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

4.3. Immune-related extracellular functions (cytokine-like roles)
Extracellular HSP70 is described as having immunomodulatory functions: it can be found complexed to antigenic peptides, present in exosomes, or as soluble protein; it can assist antigen transit to MHC in antigen-presenting cells and can drive tolerogenic or pro-inflammatory/autoimmune responses depending on context. https://doi.org/10.3390/biom13020272 (published Feb 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2)

Current applications and real-world implementations (with quantitative statistics)

5.1. Biomarker/diagnostic feature: E. coli sepsis transcriptomics (2023)
A 2023 Diagnostics study identified HSPA1B as an E. coli infection–specific hub gene and validated its diagnostic performance in an external dataset (GSE6269), reporting ROC-AUC = 0.7038 for HSPA1B (TNF ROC-AUC = 0.7116). https://doi.org/10.3390/diagnostics13233542 (published Nov 2023) (shao2023escherichiacoliinfection pages 1-2)

Interpretation: This supports potential use of HSPA1B expression as part of multi-gene classifiers for pathogen-specific sepsis characterization, though AUC indicates moderate discrimination and would require prospective validation. (shao2023escherichiacoliinfection pages 1-2)

5.2. Clinical tissue expression in inflammatory vulvar dermatoses (2023)
A 2023 study quantified HSPA1B expression in vulvar tissue:
• Controls: 6.54 ± 3.41
• Lichen sclerosus (LS): 9.94 ± 6.88
• Lichen planus (LP): 9.43 ± 2.31
The authors report HSPA1A/HSPA1B expression tends to be higher in LS/LP versus controls, but in this dataset HSPA1B differences did not reach statistical significance, and HSPA1A and HSPA1B were strongly correlated (Rs = 0.74; p = 0.00). https://doi.org/10.5603/gp.a2023.0011 (published Feb 2023) (marzec2023expressionofheat pages 1-2, marzec2023expressionofheat pages 2-3)

Interpretation: This provides real-world quantitative expression data supporting stress-response chaperone activation in chronic inflammatory tissue settings, while also illustrating that HSPA1B-specific signals may be subtle in small cohorts. (marzec2023expressionofheat pages 2-3)

5.3. Oncology: extracellular HSP70 as biomarker/target (2024)
A 2024 review frames extracellular HSP70 (including HSPA1B among isoforms detected in membrane/exosomal compartments) as a tumor biomarker and a therapeutic target candidate, because extracellular HSP70 associates with cancer-related processes (proliferation, apoptosis balance, ECM remodeling, EMT, angiogenesis) and treatment resistance (chemo-/radio-/anti-PD-1) in the compiled literature. https://doi.org/10.3389/fonc.2024.1388999 (published Apr 2024) (hu2024diversityofextracellular pages 1-2)

5.4. Therapeutic targeting considerations (expert synthesis, 2023)
A 2023 onco-hematology review provides an expert, critical assessment: despite extensive preclinical work positioning HSP70 as highly cytoprotective and implicated in poor prognosis and therapy resistance, “HSP70 inhibitors never reached the clinic” (as of the review). The review also highlights indirect strategies targeting HSP70 partners such as HSF1 or co-chaperones as alternative angles. https://doi.org/10.3390/biom13040604 (published Mar 2023) (mouawad2023isitstill pages 2-4)

Expert opinion and consensus themes (authoritative analyses)

6.1. Consensus on inducible HSP70s (HSPA1A/HSPA1B) as core stress-response chaperones
Two independent 2023 reviews (hypertension/immunity; onco-hematology) converge on the view that HSPA1A and HSPA1B are major stress-inducible HSP70 proteins with central roles in proteostasis, survival signaling, and immune modulation, and that these inducible HSP70s can be present in cytosol/nucleus and extracellularly (including exosomes). https://doi.org/10.3390/biom13020272 (Feb 2023); https://doi.org/10.3390/biom13040604 (Mar 2023) (rodrigueziturbe2023hsp70andprimary pages 1-2, mouawad2023isitstill pages 2-4)

6.2. Emerging consensus on extracellular trafficking as regulated (not merely leakage)
The 2024 synthesis emphasizes that extracellular HSP70 is often actively trafficked through specific pathways (EVs, nonclassical secretion) and that membrane association involves specific lipid interactions and microdomain partitioning, aligning extracellular HSP70 biology with regulated intercellular signaling rather than only necrotic release. https://doi.org/10.3389/fonc.2024.1388999 (Apr 2024) (hu2024diversityofextracellular pages 2-4, hu2024diversityofextracellular pages 1-2)

Limitations of current evidence for HSPA1B-specific functional annotation

7.1. Isoform resolution
Many mechanistic claims in the 2023–2024 literature are at “HSP70” or “inducible HSP70” resolution rather than explicitly HSPA1B, and the reviewed evidence indicates shared features among HSPA1A/HSPA1B/HSPA1L in localization and extracellular trafficking. Accordingly, the most defensible HSPA1B-specific statements from the retrieved evidence are: (i) identity mapping to UniProt P0DMV9 and (ii) localization being cytosol/nucleus and (also reported) exosomes. (grey2023theregulationof pages 105-108, mouawad2023isitstill pages 2-4)

7.2. PTMs and pathway membership
The 2024 review notes PTMs influence exosome loading of HSP70, but does not specify HSPA1B site-level modifications in the retrieved excerpt. Therefore, this report cannot provide a confident residue-specific PTM annotation for HSPA1B based on the available 2023–2024 evidence corpus here. (hu2024diversityofextracellular pages 2-4)

Key references (URLs and publication dates)

• Hu B, Liu G, Zhao K, Zhang G. “Diversity of extracellular HSP70 in cancer: advancing from a molecular biomarker to a novel therapeutic target.” Frontiers in Oncology. Published Apr 2024. https://doi.org/10.3389/fonc.2024.1388999 (hu2024diversityofextracellular pages 1-2, hu2024diversityofextracellular pages 2-4, hu2024diversityofextracellular media 859e9929)

• Rodriguez-Iturbe B, Johnson RJ, Sanchez-Lozada LG, Pons H. “HSP70 and Primary Arterial Hypertension.” Biomolecules. Published Feb 2023. https://doi.org/10.3390/biom13020272 (rodrigueziturbe2023hsp70andprimary pages 1-2)

• Mouawad N, et al. “Is It Still Possible to Think about HSP70 as a Therapeutic Target in Onco-Hematological Diseases?” Biomolecules. Published Mar 2023. https://doi.org/10.3390/biom13040604 (mouawad2023isitstill pages 2-4)

• Shao Q, et al. “Escherichia coli Infection Sepsis: An Analysis of Specifically Expressed Genes and Clinical Indicators.” Diagnostics. Published Nov 2023. https://doi.org/10.3390/diagnostics13233542 (shao2023escherichiacoliinfection pages 1-2)

• Marzec A, et al. “Expression of heat shock proteins HSPA1A, HSPA1B and TP53 in vulval lichen planus and vulval lichen sclerosus.” Ginekologia Polska. Published Feb 2023. https://doi.org/10.5603/gp.a2023.0011 (marzec2023expressionofheat pages 1-2, marzec2023expressionofheat pages 2-3)

• Grey GS. (2023) Table-based UniProt mapping for human HspA1B = P0DMV9 and related paralogs. (Note: source metadata incomplete in retrieval; use cautiously for conclusions beyond accession mapping.) (grey2023theregulationof pages 105-108)

Figure cited
• Graphical summary of extracellular HSP70 trafficking states/routes (membrane-associated, EV-associated, soluble secretion/necrosis) from Hu et al., 2024. (hu2024diversityofextracellular media 859e9929)

References

(mouawad2023isitstill pages 2-4): Nayla Mouawad, Guido Capasso, Edoardo Ruggeri, Leonardo Martinello, Filippo Severin, Andrea Visentin, Monica Facco, Livio Trentin, and Federica Frezzato. Is it still possible to think about hsp70 as a therapeutic target in onco-hematological diseases? Biomolecules, 13:604, Mar 2023. URL: https://doi.org/10.3390/biom13040604, doi:10.3390/biom13040604. This article has 19 citations.
(grey2023theregulationof pages 105-108): GS Grey. The regulation of the hsp70 family molecular chaperone bip via phosphorylation. Unknown journal, 2023.
(rodrigueziturbe2023hsp70andprimary pages 1-2): Bernardo Rodriguez-Iturbe, Richard J. Johnson, Laura Gabriela Sanchez-Lozada, and Hector Pons. Hsp70 and primary arterial hypertension. Biomolecules, 13:272, Feb 2023. URL: https://doi.org/10.3390/biom13020272, doi:10.3390/biom13020272. This article has 26 citations.
(hu2024diversityofextracellular pages 1-2): Binbin Hu, Guihong Liu, Kejia Zhao, and Gao Zhang. Diversity of extracellular hsp70 in cancer: advancing from a molecular biomarker to a novel therapeutic target. Frontiers in Oncology, Apr 2024. URL: https://doi.org/10.3389/fonc.2024.1388999, doi:10.3389/fonc.2024.1388999. This article has 24 citations.
(hu2024diversityofextracellular pages 2-4): Binbin Hu, Guihong Liu, Kejia Zhao, and Gao Zhang. Diversity of extracellular hsp70 in cancer: advancing from a molecular biomarker to a novel therapeutic target. Frontiers in Oncology, Apr 2024. URL: https://doi.org/10.3389/fonc.2024.1388999, doi:10.3389/fonc.2024.1388999. This article has 24 citations.
(hu2024diversityofextracellular media 859e9929): Binbin Hu, Guihong Liu, Kejia Zhao, and Gao Zhang. Diversity of extracellular hsp70 in cancer: advancing from a molecular biomarker to a novel therapeutic target. Frontiers in Oncology, Apr 2024. URL: https://doi.org/10.3389/fonc.2024.1388999, doi:10.3389/fonc.2024.1388999. This article has 24 citations.
(shao2023escherichiacoliinfection pages 1-2): Qingyi Shao, Danlei Chen, Simiao Chen, Xuanwen Ru, and Qing Ye. Escherichia coli infection sepsis: an analysis of specifically expressed genes and clinical indicators. Diagnostics, 13:3542, Nov 2023. URL: https://doi.org/10.3390/diagnostics13233542, doi:10.3390/diagnostics13233542. This article has 20 citations.
(marzec2023expressionofheat pages 1-2): Adrianna Marzec, Aleksandra Augusciak-Duma, Dominika Kupny-Bujoczek, Lukasz Witek, Anita Olejek, and Iwona Gabriel. Expression of heat shock proteins hspa1a, hspa1b and tp53 in vulval lichen planus and vulval lichen sclerosus. Ginekologia polska, Feb 2023. URL: https://doi.org/10.5603/gp.a2023.0011, doi:10.5603/gp.a2023.0011. This article has 2 citations and is from a peer-reviewed journal.
(marzec2023expressionofheat pages 2-3): Adrianna Marzec, Aleksandra Augusciak-Duma, Dominika Kupny-Bujoczek, Lukasz Witek, Anita Olejek, and Iwona Gabriel. Expression of heat shock proteins hspa1a, hspa1b and tp53 in vulval lichen planus and vulval lichen sclerosus. Ginekologia polska, Feb 2023. URL: https://doi.org/10.5603/gp.a2023.0011, doi:10.5603/gp.a2023.0011. This article has 2 citations and is from a peer-reviewed journal.

Citations

mouawad2023isitstill pages 2-4
grey2023theregulationof pages 105-108
hu2024diversityofextracellular pages 1-2
hu2024diversityofextracellular pages 2-4
shao2023escherichiacoliinfection pages 1-2
marzec2023expressionofheat pages 2-3
marzec2023expressionofheat pages 1-2
https://doi.org/10.3390/biom13040604
https://doi.org/10.3390/biom13020272
https://doi.org/10.3389/fonc.2024.1388999
https://doi.org/10.3390/diagnostics13233542
https://doi.org/10.5603/gp.a2023.0011
https://doi.org/10.3390/biom13040604,
https://doi.org/10.3390/biom13020272,
https://doi.org/10.3389/fonc.2024.1388999,
https://doi.org/10.3390/diagnostics13233542,
https://doi.org/10.5603/gp.a2023.0011,

📄 View Raw YAML

id: P0DMV9
gene_symbol: HSPA1B
product_type: PROTEIN
status: IN_PROGRESS
taxon:
  id: NCBITaxon:9606
  label: Homo sapiens
description: >-
  HSPA1B (Heat shock 70 kDa protein 1B, also known as HSP72/HSP70-2) encodes
  a stress-inducible member of the HSP70 molecular chaperone family. The protein
  encoded by HSPA1B is >99% identical to HSPA1A (HSP70-1) and functions as an
  ATP-dependent foldase chaperone. It has the conserved tripartite HSP70
  architecture: an N-terminal nucleotide-binding domain (NBD/ATPase, residues
  2-386), a C-terminal substrate-binding domain (SBD) that engages client
  polypeptides via exposed hydrophobic segments, and a C-terminal tail mediating
  co-chaperone interactions (DOI:10.3390/biom13020272). HSPA1B plays a pivotal
  role in the protein quality control system, assisting in the correct folding of
  newly synthesized polypeptides, refolding of misfolded proteins, prevention of
  protein aggregation, and targeting of terminally misfolded proteins for
  proteasomal degradation. Its chaperone cycle is regulated by co-chaperones
  including J-domain proteins (HSP40s/DNAJs) that stimulate ATP hydrolysis and
  assist substrate recognition, nucleotide exchange factors (BAG1/2/3, HSPH1),
  and TPR domain co-chaperones (HOPX, STUB1/CHIP)
  (DOI:10.3390/biom13020272). Stress-induced expression can reach very high
  levels, reported up to approximately 15% of total cellular protein
  (DOI:10.3390/biom13020272). Beyond its intracellular roles, HSPA1B is also
  found on the plasma membrane and in extracellular vesicles (exosomes),
  where it can be actively secreted via non-classical pathways including
  secretory granules, ABC transporter-mediated endolysosomal translocation,
  and exosome/ectosome release (DOI:10.3389/fonc.2024.1388999). Membrane-
  associated HSPA1B binds negatively charged phospholipids (especially
  phosphatidylserine), oligomerizes upon membrane insertion, and exposes a
  defined extracellular epitope (TKD peptide, aa450-461) detectable by
  cmHSP70.1 antibody (DOI:10.3390/biom13040604). HSPA1B also participates
  in centrosome function during mitosis, regulation of apoptosis, and various
  signaling pathways including NF-kappaB and NOD2 signaling.
existing_annotations:
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      HSP70/HSPA1B localizes to the nucleus under stress conditions. IDA evidence
      from PMID:10205060 and PMID:17167422 confirms nuclear localization. UniProt
      notes HSPA1B translocates to the nucleus during heat shock, where it participates
      in mRNA decay regulation and erythropoiesis-related functions. Reactome entries
      describe HSP70 nuclear transport via Hikeshi (R-HSA-5252041) and nuclear roles
      in HSF1 regulation.
    action: ACCEPT
    reason: >-
      Well-supported by phylogenetic inference and confirmed by multiple IDA annotations.
      HSPA1B is known to shuttle between cytoplasm and nucleus, particularly under
      stress conditions.
    supported_by:
    - reference_id: PMID:10205060
      supporting_text: >-
        Induction of hsp70 by heat shock, down-regulation of the ubiquitin-proteasome
        network, or inactivation of ubiquitinating enzyme E1 all result in hsp70
        sequestration of AUF1 in the perinucleus-nucleus
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      HSPA1B is predominantly cytoplasmic under basal conditions. UniProt lists
      cytoplasm as a primary subcellular location (ECO:0000269|PubMed:17289661).
      Multiple IDA annotations confirm cytoplasmic localization (PMID:10859165,
      PMID:24061851, PMID:9553041, PMID:24790089).
    action: ACCEPT
    reason: >-
      Core localization for HSPA1B, well-supported by IBA and multiple IDA annotations.
- term:
    id: GO:0005886
    label: plasma membrane
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      Phylogenetic inference places HSPA1B at the plasma membrane. HSP70 family
      members have been reported at the cell surface in some contexts, including
      as a receptor for rotavirus A entry (PMID:16537599, referenced in UniProt).
      This is consistent with the IBA annotation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Plasma membrane localization is not a core feature of HSPA1B function but is
      phylogenetically supported and consistent with some reported activities such
      as virus receptor function.
- term:
    id: GO:0016887
    label: ATP hydrolysis activity
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      ATP hydrolysis is the central enzymatic activity of HSP70 chaperones. HSPA1B
      has a well-characterized N-terminal ATPase domain (NBD, residues 2-386) with
      multiple ATP binding sites confirmed by X-ray crystallography. IDA evidence
      from PMID:21231916 directly demonstrates ATPase activity, and Reactome entry
      R-HSA-3371422 describes ATP hydrolysis by HSP70 in detail.
    action: ACCEPT
    reason: >-
      Core molecular function of HSPA1B. ATP hydrolysis drives the chaperone cycle
      and is essential for all HSP70 functions.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        HSPA6 has a functional substrate-binding domain and possesses intrinsic
        ATPase activity that is as high as that of the canonical HSPA1A when
        stimulated by J-proteins.
- term:
    id: GO:0031072
    label: heat shock protein binding
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      HSPA1B interacts with numerous heat shock proteins including HSP40/DNAJ
      co-chaperones (DNAJC7, DNAJC8, DNAJC9, DNAJB1), HSP90, and HSP110/HSPH1.
      These interactions are essential for the chaperone cycle. IPI evidence from
      PMID:17182002, PMID:21231916, and PMID:23921388 confirms these interactions.
    action: ACCEPT
    reason: >-
      Core function. HSP70 co-chaperone interactions are fundamental to the
      chaperone cycle and are well-supported by both phylogenetic and experimental
      evidence.
- term:
    id: GO:0044183
    label: protein folding chaperone
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      HSPA1B is a bona fide ATP-dependent protein folding chaperone. This is the
      core molecular function annotation for this gene. IDA evidence from
      PMID:15603737 directly demonstrates chaperone activity. UniProt describes
      HSPA1B as a "Molecular chaperone implicated in a wide variety of cellular
      processes, including protection of the proteome from stress, folding and
      transport of newly synthesized polypeptides."
    action: ACCEPT
    reason: >-
      The defining molecular function of HSPA1B. Well-supported by both phylogenetic
      inference and direct experimental evidence.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        whereas overexpression of HSPA1A protected cells from heat-induced cell
        death, overexpression of HSPA6 did not
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      Cytosol is the primary subcellular compartment where HSPA1B exerts its
      chaperone function. Confirmed by IDA (GO_REF:0000052, PMID:21231916) and
      multiple Reactome TAS annotations describing cytosolic chaperone activities.
    action: ACCEPT
    reason: >-
      Core localization for HSPA1B chaperone function in the cytosol.
- term:
    id: GO:0042026
    label: protein refolding
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      Protein refolding is a core biological process for HSPA1B. IDA evidence from
      PMID:21231916 and PMID:15603737 demonstrates luciferase refolding activity.
      PMID:27708256 shows that acetylation state determines whether HSPA1B functions
      in protein refolding vs degradation.
    action: ACCEPT
    reason: >-
      Core biological process. HSPA1B actively refolds heat-denatured substrates
      through its ATP-dependent chaperone cycle.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        Overexpressed chaperones that suppressed polyQ aggregation were found not
        to be able to stimulate luciferase refolding. Inversely, chaperones that
        supported luciferase refolding were poor suppressors of polyQ aggregation.
- term:
    id: GO:0032436
    label: positive regulation of proteasomal ubiquitin-dependent protein catabolic
      process
  evidence_type: IBA
  original_reference_id: GO_REF:0000033
  review:
    summary: >-
      HSPA1B participates in targeting misfolded proteins for proteasomal degradation
      through its interaction with STUB1/CHIP E3 ubiquitin ligase. PMID:27708256
      shows that deacetylated HSP70 binds STUB1, promoting ubiquitin-mediated
      protein degradation. PMID:12150907 demonstrates the CHIP-Hsp70-Parkin complex
      facilitating ubiquitination.
    action: ACCEPT
    reason: >-
      Core function of the HSP70 chaperone system. HSP70 triages substrates between
      refolding and degradation pathways, with STUB1/CHIP mediating the degradation arm.
- term:
    id: GO:0046718
    label: symbiont entry into host cell
  evidence_type: IEA
  original_reference_id: GO_REF:0000108
  review:
    summary: >-
      IEA annotation from logical inference. UniProt notes that HSPA1B serves as a
      post-attachment receptor for rotavirus A to facilitate entry into the cell
      (PMID:16537599). This is a specialized, non-core function.
    action: KEEP_AS_NON_CORE
    reason: >-
      Supported by virus receptor activity documented in UniProt, but this is a
      secondary role exploited by pathogens rather than a core cellular function.
- term:
    id: GO:0000166
    label: nucleotide binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000043
  review:
    summary: >-
      IEA from UniProt keyword mapping. HSPA1B binds ATP/ADP through its
      N-terminal NBD, confirmed by crystal structures and IDA evidence for ATP
      binding (PMID:23921388). This is a broad parent term of ATP binding.
    action: ACCEPT
    reason: >-
      Correct but very general. Subsumed by the more specific ATP binding annotation
      which is also present. Acceptable as an IEA broadening.
- term:
    id: GO:0001618
    label: virus receptor activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000043
  review:
    summary: >-
      IEA from UniProt keyword mapping for Host cell receptor for virus entry.
      UniProt documents that HSPA1B serves as a post-attachment receptor for
      rotavirus A (PMID:16537599).
    action: KEEP_AS_NON_CORE
    reason: >-
      Documented in UniProt but represents a non-core function exploited by viruses.
- term:
    id: GO:0001664
    label: G protein-coupled receptor binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:12150907 documents HSP70
      interaction with Pael-R (an orphan GPCR). UniProt also records an interaction
      with F2RL1 (a GPCR). However, this binding is in the context of chaperone
      substrate recognition, not classical GPCR signaling.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      While HSPA1B does bind GPCRs such as Pael-R, this is in the context of
      chaperone-substrate interaction, not GPCR-specific binding activity. The term
      implies a specific functional binding to GPCRs as signaling partners.
- term:
    id: GO:0005524
    label: ATP binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: >-
      IEA from combined automated annotation. ATP binding is a core function of
      HSPA1B confirmed by crystal structures of the NBD domain with ADP/ATP and
      IDA evidence (PMID:23921388).
    action: ACCEPT
    reason: >-
      Core molecular function. ATP binding drives the chaperone cycle.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: >-
      IEA from UniProt subcellular location mapping. Confirmed by multiple IDA
      annotations and IBA.
    action: ACCEPT
    reason: >-
      Correct and redundant with IBA and IDA annotations for this localization.
- term:
    id: GO:0005813
    label: centrosome
  evidence_type: IEA
  original_reference_id: GO_REF:0000044
  review:
    summary: >-
      IEA from UniProt subcellular location. UniProt records centrosome localization
      (ECO:0000269|PubMed:27137183). IDA evidence from PMID:27137183 confirms
      HSP70 accumulates at the mitotic centrosome during prometaphase to metaphase.
    action: ACCEPT
    reason: >-
      Supported by experimental evidence. HSPA1B localizes to centrosomes during
      mitosis where it regulates centrosome integrity.
- term:
    id: GO:0005814
    label: centriole
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:24061851 and GO_REF:0000052
      confirms centriole localization of HSPA1A (functionally identical to HSPA1B)
      under stress conditions.
    action: ACCEPT
    reason: >-
      Confirmed by IDA evidence showing stress-induced centriole localization.
- term:
    id: GO:0006402
    label: mRNA catabolic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. Supported by IDA from PMID:10205060 which demonstrates
      that hsp70 participates in AU-rich element-mediated mRNA decay by sequestering
      AUF1 in the perinucleus-nucleus during heat shock.
    action: KEEP_AS_NON_CORE
    reason: >-
      While experimentally supported, mRNA catabolism is a secondary consequence
      of HSP70 chaperone activity on AUF1, not a core function.
- term:
    id: GO:0008285
    label: negative regulation of cell population proliferation
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:9553041 shows that HSP70
      association with WT1 is required for WT1-mediated inhibition of cell
      proliferation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but represents a secondary, context-dependent
      function dependent on interaction with specific partners like WT1.
- term:
    id: GO:0016235
    label: aggresome
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:15885686 confirms aggresome
      localization. HSP70 chaperones are recruited to aggresomes as part of the
      protein quality control response.
    action: ACCEPT
    reason: >-
      Confirmed by IDA evidence. Aggresome localization is consistent with
      HSP70 role in protein quality control.
- term:
    id: GO:0016607
    label: nuclear speck
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:9553041 confirms nuclear speck
      localization of HSP70.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally confirmed but represents a specific subnuclear localization
      that is not central to HSPA1B core function.
- term:
    id: GO:0016887
    label: ATP hydrolysis activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000120
  review:
    summary: >-
      IEA from combined automated annotation. Redundant with IBA and IDA
      annotations for the same term. Core function of HSPA1B.
    action: ACCEPT
    reason: >-
      Correct and consistent with IBA and IDA evidence for this core activity.
- term:
    id: GO:0030308
    label: negative regulation of cell growth
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:9553041 shows HSP70 is
      required for WT1-mediated growth inhibition.
    action: KEEP_AS_NON_CORE
    reason: >-
      Context-dependent secondary function mediated through WT1 interaction.
- term:
    id: GO:0031072
    label: heat shock protein binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. Redundant with IBA and multiple IPI annotations for
      the same term. Well-supported by extensive co-chaperone interaction data.
    action: ACCEPT
    reason: >-
      Correct and consistent with IBA and IPI evidence.
- term:
    id: GO:0031397
    label: negative regulation of protein ubiquitination
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:12150907 shows HSP70
      participates in regulating ubiquitination of Pael-R in the CHIP-Parkin
      complex. HSP70 binding can shield substrates from ubiquitination.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but represents a context-dependent regulatory
      outcome of chaperone activity rather than a core function.
- term:
    id: GO:0031625
    label: ubiquitin protein ligase binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IPI evidence from PMID:12150907 and PMID:15603737
      confirms binding to E3 ligases CHIP/STUB1, Parkin, and BAG5. This is a
      key part of the chaperone triage system.
    action: ACCEPT
    reason: >-
      Core co-chaperone interaction. HSP70 binding to E3 ubiquitin ligases like
      STUB1/CHIP is integral to the protein quality control triage mechanism.
- term:
    id: GO:0032757
    label: positive regulation of interleukin-8 production
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:24790089 shows HSP70
      involvement in NOD2-mediated NF-kappaB signaling, which leads to IL-8
      production in response to bacterial cell wall fragments.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but a downstream consequence of HSP70 stabilization
      of NOD2, not a core chaperone function.
- term:
    id: GO:0034599
    label: cellular response to oxidative stress
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. TAS evidence from PMID:24252804 supports this
      annotation in the context of Parkinson disease pathogenesis.
    action: KEEP_AS_NON_CORE
    reason: >-
      HSP70 is induced by and participates in oxidative stress response, but
      this is a general stress-responsive phenotype rather than a core function.
- term:
    id: GO:0042026
    label: protein refolding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. Redundant with IBA and IDA annotations for the same
      term. Core function of HSPA1B.
    action: ACCEPT
    reason: >-
      Correct and consistent with IBA and multiple IDA annotations.
- term:
    id: GO:0042826
    label: histone deacetylase binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IPI evidence from PMID:16809764 confirms interaction
      with HDAC8, and UniProt documents interaction with HDAC4 (PMID:27708256).
      HDAC4 deacetylates HSP70 at Lys-77 to regulate chaperone function.
    action: ACCEPT
    reason: >-
      Confirmed by experimental evidence. HDAC binding is functionally relevant
      to regulation of HSP70 chaperone activity.
- term:
    id: GO:0044183
    label: protein folding chaperone
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. Redundant with IBA and IDA for the same core
      molecular function.
    action: ACCEPT
    reason: >-
      Core molecular function, confirmed by multiple evidence types.
- term:
    id: GO:0045648
    label: positive regulation of erythrocyte differentiation
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:17167422 shows Hsp70 protects
      GATA-1 from caspase-3-mediated cleavage during erythropoiesis.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but a tissue-specific downstream consequence of
      HSP70 anti-apoptotic activity rather than a core function.
- term:
    id: GO:0046034
    label: ATP metabolic process
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:23921388 supports this.
      HSPA1B hydrolyzes ATP as part of its chaperone cycle.
    action: ACCEPT
    reason: >-
      Correct. ATP metabolic process is an inherent aspect of the ATPase-driven
      chaperone cycle.
- term:
    id: GO:0048471
    label: perinuclear region of cytoplasm
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:10205060 and PMID:15603737
      confirms perinuclear localization.
    action: ACCEPT
    reason: >-
      Confirmed by IDA evidence. Perinuclear localization is observed particularly
      during stress conditions.
- term:
    id: GO:0050821
    label: protein stabilization
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. TAS evidence from PMID:24252804 supports this.
      PMID:24790089 directly demonstrates HSP70 stabilizes NOD2 by increasing
      its half-life. UniProt also describes HSP70 stabilization of ATF5
      (PMID:22528486).
    action: ACCEPT
    reason: >-
      Well-supported function. HSP70 chaperone activity inherently stabilizes
      client proteins, preventing misfolding and degradation.
- term:
    id: GO:0051082
    label: unfolded protein binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962).
      This IEA annotation from ARBA machine learning models reflects the well-known
      ability of HSP70 chaperones to bind unfolded/misfolded proteins as substrates,
      but the term conflates substrate binding with the chaperone activity itself.
      HSPA1B is a bona fide ATP-dependent foldase chaperone that actively assists
      protein folding through iterative cycles of ATP hydrolysis, substrate binding,
      and release (PMID:21231916, PMID:24012426). The correct molecular function
      annotation is GO:0044183 (protein folding chaperone), which already has both
      IBA and IDA support for this gene product. UniProt describes HSPA1B as a
      "Molecular chaperone implicated in a wide variety of cellular processes,
      including protection of the proteome from stress, folding and transport of
      newly synthesized polypeptides" (UniProt:P0DMV9).
    action: MODIFY
    reason: >-
      GO:0051082 is being obsoleted. HSPA1B does not merely bind unfolded proteins
      passively; it is an active ATP-dependent protein folding chaperone. The
      replacement term GO:0044183 (protein folding chaperone) accurately captures
      the molecular function and is already annotated to HSPA1B via IBA
      (GO_REF:0000033) and IDA (PMID:15603737) evidence.
    proposed_replacement_terms:
    - id: GO:0044183
      label: protein folding chaperone
    additional_reference_ids:
    - PMID:21231916
    - PMID:24012426
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        Overexpressed chaperones that suppressed polyQ aggregation were found not
        to be able to stimulate luciferase refolding. Inversely, chaperones that
        supported luciferase refolding were poor suppressors of polyQ aggregation.
- term:
    id: GO:0055131
    label: C3HC4-type RING finger domain binding
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IPI evidence from PMID:25281747 confirms interaction
      with RNF207, a RING finger protein. HSP70 also interacts with CHIP/STUB1
      which contains a U-box domain related to RING fingers.
    action: ACCEPT
    reason: >-
      Confirmed by experimental evidence for binding to RING domain proteins.
- term:
    id: GO:0070370
    label: cellular heat acclimation
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:21231916 confirms that
      HSPA1A (functionally identical to HSPA1B) protects cells from heat-induced
      cell death and is involved in thermotolerance.
    action: ACCEPT
    reason: >-
      Core stress-response function. HSPA1B is heat-inducible and protects cells
      during heat stress.
- term:
    id: GO:0070434
    label: positive regulation of nucleotide-binding oligomerization domain containing
      2 signaling pathway
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:24790089 confirms that HSP70
      binds and stabilizes NOD2, enhancing NOD2-mediated signaling in response to
      bacterial cell wall fragments.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but represents a specific downstream signaling
      consequence of HSP70 chaperone activity on NOD2, not a core function.
- term:
    id: GO:0071383
    label: cellular response to steroid hormone stimulus
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. TAS evidence from Reactome R-HSA-3371497 documents
      HSP70 role in the HSP90 chaperone cycle for steroid hormone receptors.
      HSP70 participates in the maturation of steroid hormone receptor complexes.
    action: KEEP_AS_NON_CORE
    reason: >-
      HSP70 participates in steroid hormone receptor maturation as part of the
      HSP70/HSP90 chaperone relay, but this is a general chaperone function
      rather than a specific steroid hormone response.
- term:
    id: GO:0090063
    label: positive regulation of microtubule nucleation
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:27137183 confirms HSP70
      is required for microtubule nucleation from the mitotic centrosome,
      interacting with NEDD1 and gamma-tubulin.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported centrosome-related function during mitosis but
      not a core chaperone function.
- term:
    id: GO:0090084
    label: negative regulation of inclusion body assembly
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:21231916 and PMID:15603737
      confirms HSPA1B suppresses protein aggregation and inclusion body formation.
    action: ACCEPT
    reason: >-
      Core chaperone function. Preventing protein aggregation and inclusion body
      formation is a direct consequence of HSP70 foldase activity.
- term:
    id: GO:0140545
    label: ATP-dependent protein disaggregase activity
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:23921388 confirms
      disaggregase activity. HSP70 works with co-chaperones to disaggregate
      and refold aggregated proteins.
    action: ACCEPT
    reason: >-
      Core molecular function. HSP70 disaggregase activity is well-established
      and directly related to its protein quality control role.
- term:
    id: GO:1901673
    label: regulation of mitotic spindle assembly
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:27137183 shows HSP70
      is required for bipolar spindle assembly, and its inhibition disrupts
      spindle formation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but represents a specific mitotic function
      rather than the core chaperone activity.
- term:
    id: GO:1903265
    label: positive regulation of tumor necrosis factor-mediated signaling pathway
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:24790089 supports HSP70
      involvement in inflammatory signaling through NOD2 stabilization.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported downstream effect of HSP70 chaperone activity
      on innate immune signaling components.
- term:
    id: GO:1904813
    label: ficolin-1-rich granule lumen
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. TAS evidence from Reactome R-HSA-6800434
      (exocytosis of ficolin-rich granule lumen proteins) supports this
      localization in neutrophils.
    action: KEEP_AS_NON_CORE
    reason: >-
      Cell-type-specific localization in neutrophils, supported by Reactome
      but not a core localization for HSPA1B.
- term:
    id: GO:1990904
    label: ribonucleoprotein complex
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IDA evidence from PMID:17289661 confirms HSPA1B
      is a component of IGF2BP1 (IMP1) mRNP granules containing untranslated
      mRNAs. UniProt notes this localization.
    action: ACCEPT
    reason: >-
      Confirmed by mass spectrometry identification in mRNP granule complex.
- term:
    id: GO:2001240
    label: negative regulation of extrinsic apoptotic signaling pathway in absence
      of ligand
  evidence_type: IEA
  original_reference_id: GO_REF:0000117
  review:
    summary: >-
      IEA from ARBA models. IMP evidence from PMID:17167422 shows Hsp70
      protects GATA-1 from caspase-3 cleavage, preventing apoptosis during
      erythropoiesis.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported anti-apoptotic function but represents a
      specific downstream effect of HSP70 chaperone activity.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:28298427
  review:
    summary: >-
      Protein binding from systematic GPCR-protein interaction mapping. HSPA1B
      binds many proteins as a chaperone; protein binding is uninformative.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone that
      interacts with hundreds of substrates and co-chaperones. More specific
      binding terms are already annotated.
- term:
    id: GO:0043123
    label: positive regulation of canonical NF-kappaB signal transduction
  evidence_type: IMP
  original_reference_id: PMID:24790089
  review:
    summary: >-
      PMID:24790089 demonstrates that HSP70 stabilizes NOD2, and an HSP70
      inhibitor (KNK437) decreases NOD2-mediated NF-kappaB activation in
      response to bacterial cell wall stimulation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally well-supported but a downstream consequence of HSP70
      stabilization of NOD2 rather than a core chaperone function.
    supported_by:
    - reference_id: PMID:24790089
      supporting_text: >-
        an HSP70 inhibitor, KNK437, was capable of decreasing NOD2-mediated
        NF-kappaB activation in response to bacterial cell wall stimulation
- term:
    id: GO:0070434
    label: positive regulation of nucleotide-binding oligomerization domain containing
      2 signaling pathway
  evidence_type: IMP
  original_reference_id: PMID:24790089
  review:
    summary: >-
      PMID:24790089 shows induced HSP70 expression increases NOD2 response to
      bacterial cell wall fragments by stabilizing NOD2 protein.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally well-supported. HSP70 enhances NOD2 signaling by increasing
      NOD2 stability, but this is a secondary consequence of chaperone activity.
    supported_by:
    - reference_id: PMID:24790089
      supporting_text: >-
        Induced HSP70 expression in cells increased the response of NOD2 to
        bacterial cell wall fragments.
- term:
    id: GO:0005814
    label: centriole
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  review:
    summary: >-
      IDA from immunofluorescence curation. HSPA1B localizes to centrioles
      under stress conditions, consistent with its role in centrosome integrity
      during mitosis (PMID:24061851, PMID:27137183).
    action: ACCEPT
    reason: >-
      Confirmed by immunofluorescence data and consistent with published
      literature on HSP70 centrosome function.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: IDA
  original_reference_id: GO_REF:0000052
  review:
    summary: >-
      IDA from immunofluorescence curation confirming cytosolic localization.
      Core localization for HSPA1B.
    action: ACCEPT
    reason: >-
      Core localization confirmed by immunofluorescence.
- term:
    id: GO:0071383
    label: cellular response to steroid hormone stimulus
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371497
  review:
    summary: >-
      TAS from Reactome describing HSP90 chaperone cycle for steroid hormone
      receptors, in which HSP70 participates by delivering client proteins to
      the HSP90 complex via HOP/STIP1.
    action: KEEP_AS_NON_CORE
    reason: >-
      HSP70 participates in steroid hormone receptor maturation as part of the
      HSP70-HSP90 relay system, but this is a general chaperone function.
- term:
    id: GO:0016887
    label: ATP hydrolysis activity
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371422
  review:
    summary: >-
      TAS from Reactome entry R-HSA-3371422 describing ATP hydrolysis by HSP70.
      Core molecular function.
    action: ACCEPT
    reason: >-
      Core molecular function, consistent with IBA and IDA annotations.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:33857403
  review:
    summary: >-
      PMID:33857403 demonstrates DNAJC9 interacts with HSP70 to integrate heat
      shock chaperones into the histone chaperone network. The specific
      interaction is with DNAJC9 via J domain.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative. The specific interaction
      with DNAJC9 is better captured by heat shock protein binding (GO:0031072).
- term:
    id: GO:0140545
    label: ATP-dependent protein disaggregase activity
  evidence_type: IDA
  original_reference_id: PMID:23921388
  review:
    summary: >-
      PMID:23921388 characterizes METTL21A methylation of HSP70 and shows that
      methylation alters chaperone affinity for alpha-synuclein fibrils. The
      disaggregase activity is a well-established function of HSP70 chaperones.
    action: ACCEPT
    reason: >-
      Core molecular function. HSP70 disaggregase activity is integral to
      protein quality control.
- term:
    id: GO:0016887
    label: ATP hydrolysis activity
  evidence_type: IDA
  original_reference_id: PMID:21231916
  review:
    summary: >-
      PMID:21231916 directly demonstrates intrinsic ATPase activity of HSPA1A
      (functionally identical to HSPA1B) that is stimulated by J-protein
      co-chaperones. Core molecular function.
    action: ACCEPT
    reason: >-
      Core molecular function with direct experimental evidence.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        HSPA6 has a functional substrate-binding domain and possesses intrinsic
        ATPase activity that is as high as that of the canonical HSPA1A when
        stimulated by J-proteins.
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: IDA
  original_reference_id: PMID:17167422
  review:
    summary: >-
      PMID:17167422 shows Hsp70 localizes to the nucleus where it protects
      GATA-1 from caspase-3 cleavage during erythropoiesis.
    action: ACCEPT
    reason: >-
      Nuclear localization confirmed by direct assay in the context of
      erythropoiesis studies.
- term:
    id: GO:0043066
    label: negative regulation of apoptotic process
  evidence_type: IMP
  original_reference_id: PMID:17167422
  review:
    summary: >-
      PMID:17167422 demonstrates Hsp70 prevents caspase-3-mediated cleavage of
      GATA-1, thereby inhibiting apoptosis during erythroid differentiation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Well-established anti-apoptotic function of HSP70 but represents a
      downstream consequence of chaperone activity rather than core function.
- term:
    id: GO:0045648
    label: positive regulation of erythrocyte differentiation
  evidence_type: IMP
  original_reference_id: PMID:17167422
  review:
    summary: >-
      PMID:17167422 shows Hsp70 regulates erythropoiesis by preventing
      caspase-3-mediated cleavage of GATA-1, a key erythroid transcription factor.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported tissue-specific function but not a core
      chaperone activity.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:27133716
  review:
    summary: >-
      PMID:27133716 shows DNAJC8 interacts with HSP70. This is a specific
      co-chaperone interaction better captured by heat shock protein binding.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative. The DNAJC8 interaction is
      better captured by GO:0031072 (heat shock protein binding).
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:23349634
  review:
    summary: >-
      PMID:23349634 identifies lysine methyltransferases that interact with
      molecular chaperones including HSP70. Protein binding is uninformative.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a chaperone.
- term:
    id: GO:0032991
    label: protein-containing complex
  evidence_type: IDA
  original_reference_id: PMID:23349634
  review:
    summary: >-
      PMID:23349634 demonstrates HSP70 exists in complexes with lysine
      methyltransferases. HSP70 participates in many protein complexes as
      part of its chaperone function.
    action: ACCEPT
    reason: >-
      HSP70 is found in multiple protein complexes as part of its chaperone
      and co-chaperone machinery.
- term:
    id: GO:0003723
    label: RNA binding
  evidence_type: HDA
  original_reference_id: PMID:22658674
  review:
    summary: >-
      PMID:22658674 (Castello et al. 2012) is a large-scale mRNA interactome
      capture study identifying mRNA-binding proteins. HSPA1B was identified
      as an mRNA-binding protein. This is consistent with its role in mRNP
      granules (PMID:17289661).
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput data supports RNA binding. HSP70 association with mRNP
      granules is documented but RNA binding is not a core chaperone function.
- term:
    id: GO:0003723
    label: RNA binding
  evidence_type: HDA
  original_reference_id: PMID:22681889
  review:
    summary: >-
      PMID:22681889 (Baltz et al. 2012) is another large-scale mRNA-bound
      proteome study confirming HSPA1B as an mRNA-associated protein.
    action: KEEP_AS_NON_CORE
    reason: >-
      Consistent with other high-throughput data but RNA binding is not a
      core function of HSPA1B.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:15671022
  review:
    summary: >-
      PMID:15671022 shows HSP70 binds alpha-synuclein prefibrillar species,
      inhibiting fibril formation. This reflects chaperone substrate binding.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative. The alpha-synuclein
      interaction reflects chaperone substrate binding already captured by
      protein folding chaperone (GO:0044183).
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:18975920
  review:
    summary: >-
      PMID:18975920 demonstrates Hsp70 interactions with alpha-synuclein
      hydrophobic core inhibit fibril assembly. Chaperone substrate binding.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:21081504
  review:
    summary: >-
      PMID:21081504 identifies interaction between HSPA1B and ChChd3/CHCHD3,
      an inner mitochondrial membrane protein. UniProt confirms this interaction.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:9553041
  review:
    summary: >-
      PMID:9553041 shows HSP70 interaction with WT1 is required for WT1-mediated
      growth inhibition.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone.
- term:
    id: GO:0005634
    label: nucleus
  evidence_type: IDA
  original_reference_id: PMID:10205060
  review:
    summary: >-
      PMID:10205060 shows hsp70 sequesters AUF1 in the perinucleus-nucleus
      during heat shock, confirming nuclear localization.
    action: ACCEPT
    reason: >-
      Direct experimental evidence for nuclear localization during stress.
    supported_by:
    - reference_id: PMID:10205060
      supporting_text: >-
        Induction of hsp70 by heat shock, down-regulation of the ubiquitin-proteasome
        network, or inactivation of ubiquitinating enzyme E1 all result in hsp70
        sequestration of AUF1 in the perinucleus-nucleus
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IDA
  original_reference_id: PMID:10859165
  review:
    summary: >-
      PMID:10859165 documents cytoplasmic localization of HSP70 in the context
      of translation regulation during heat shock.
    action: ACCEPT
    reason: >-
      Core localization confirmed by direct assay.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: TAS
  original_reference_id: PMID:16130169
  review:
    summary: >-
      TAS from proteomics study PMID:16130169 identifying HSPA1B among 162
      proteins in human endothelial cells.
    action: ACCEPT
    reason: >-
      Core localization.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IDA
  original_reference_id: PMID:24061851
  review:
    summary: >-
      PMID:24061851 documents cytoplasmic and centriolar localization of
      HSPA1A (functionally identical to HSPA1B) under stress conditions.
    action: ACCEPT
    reason: >-
      Core localization confirmed by direct assay.
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IDA
  original_reference_id: PMID:9553041
  review:
    summary: >-
      PMID:9553041 shows cytoplasmic localization of HSP70 in the context
      of WT1 interaction studies.
    action: ACCEPT
    reason: >-
      Core localization confirmed by direct assay.
- term:
    id: GO:0005739
    label: mitochondrion
  evidence_type: TAS
  original_reference_id: PMID:16130169
  review:
    summary: >-
      TAS from proteomics study. HSPA1B is primarily cytosolic but has been
      detected in mitochondrial fractions. UniProt lists mitochondrion as
      a TAS localization. HSP70 participates in mitochondrial protein import.
    action: KEEP_AS_NON_CORE
    reason: >-
      Supported by proteomics data but mitochondrial localization is not a
      primary site for HSPA1B. Note that HSPA9/mortalin is the dedicated
      mitochondrial HSP70.
- term:
    id: GO:0005783
    label: endoplasmic reticulum
  evidence_type: TAS
  original_reference_id: PMID:16130169
  review:
    summary: >-
      TAS from proteomics study. HSPA1B has been detected in ER fractions.
      HSP70 participates in ER stress response and ERAD. Note that HSPA5/BiP
      is the dedicated ER HSP70.
    action: KEEP_AS_NON_CORE
    reason: >-
      Detected in ER fractions but HSPA1B is primarily cytosolic. HSPA5/BiP
      is the dedicated ER-resident HSP70.
- term:
    id: GO:0006402
    label: mRNA catabolic process
  evidence_type: IDA
  original_reference_id: PMID:10205060
  review:
    summary: >-
      PMID:10205060 directly demonstrates HSP70 role in AU-rich element-mediated
      mRNA decay through regulation of AUF1 localization and ubiquitination.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally well-supported but a secondary function of HSP70 rather
      than its core chaperone activity.
    supported_by:
    - reference_id: PMID:10205060
      supporting_text: >-
        Rapid decay involves AU-rich binding protein AUF1, which complexes with
        heat shock proteins hsc70-hsp70, translation initiation factor eIF4G,
        and poly(A) binding protein.
- term:
    id: GO:0008285
    label: negative regulation of cell population proliferation
  evidence_type: IMP
  original_reference_id: PMID:9553041
  review:
    summary: >-
      PMID:9553041 shows HSP70 association with WT1 is required for
      WT1-mediated inhibition of cellular proliferation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Context-dependent secondary function mediated through WT1 interaction.
- term:
    id: GO:0016235
    label: aggresome
  evidence_type: IDA
  original_reference_id: PMID:15885686
  review:
    summary: >-
      PMID:15885686 shows TRIM37 forms aggresomes that are chaperone-positive,
      indicating HSP70 recruitment to aggresomes. Consistent with HSP70 role
      in protein quality control at aggresomes.
    action: ACCEPT
    reason: >-
      Direct evidence for aggresome localization, consistent with protein
      quality control function.
- term:
    id: GO:0016607
    label: nuclear speck
  evidence_type: IDA
  original_reference_id: PMID:9553041
  review:
    summary: >-
      PMID:9553041 shows HSP70 localization to nuclear speckles in the context
      of WT1 interaction studies.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally confirmed but a specific subnuclear localization that is
      context-dependent.
- term:
    id: GO:0030308
    label: negative regulation of cell growth
  evidence_type: IMP
  original_reference_id: PMID:9553041
  review:
    summary: >-
      PMID:9553041 demonstrates HSP70 is required for WT1-mediated growth
      inhibition.
    action: KEEP_AS_NON_CORE
    reason: >-
      Context-dependent secondary function mediated through WT1 interaction.
- term:
    id: GO:0031982
    label: vesicle
  evidence_type: HDA
  original_reference_id: PMID:19190083
  review:
    summary: >-
      PMID:19190083 characterizes exosome-like vesicles from human
      tracheobronchial ciliated epithelium, identifying HSPA1B.
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput proteomics data. Vesicle localization is a secondary
      feature, not core localization.
- term:
    id: GO:0043066
    label: negative regulation of apoptotic process
  evidence_type: TAS
  original_reference_id: PMID:16130169
  review:
    summary: >-
      TAS from proteomics study describing HSPA1B in context of endothelial
      cell resistance to etoposide-induced apoptosis.
    action: KEEP_AS_NON_CORE
    reason: >-
      Anti-apoptotic function is well-established for HSP70 but represents a
      downstream consequence of chaperone activity.
- term:
    id: GO:0048471
    label: perinuclear region of cytoplasm
  evidence_type: IDA
  original_reference_id: PMID:10205060
  review:
    summary: >-
      PMID:10205060 demonstrates that hsp70 sequesters AUF1 in the
      perinucleus-nucleus during heat shock, confirming perinuclear
      localization of HSP70 by direct assay.
    action: ACCEPT
    reason: >-
      Confirmed by direct experimental evidence. Perinuclear localization
      is observed during stress conditions when HSP70 participates in
      mRNA decay regulation through AUF1 sequestration.
    supported_by:
    - reference_id: PMID:10205060
      supporting_text: >-
        Induction of hsp70 by heat shock, down-regulation of the
        ubiquitin-proteasome network, or inactivation of ubiquitinating
        enzyme E1 all result in hsp70 sequestration of AUF1 in the
        perinucleus-nucleus
- term:
    id: GO:0051082
    label: unfolded protein binding
  evidence_type: TAS
  original_reference_id: PMID:16130169
  review:
    summary: >-
      GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962).
      This TAS annotation references PMID:16130169 (Bruneel et al. 2005), a
      proteomics study of human umbilical vein endothelial cells during
      etoposide-induced apoptosis. The study identified HSPA1B among 162 proteins
      and discusses functions related to "protein folding" in the context of
      endothelial cell biology. The paper does not specifically characterize
      HSPA1B unfolded protein binding activity but rather identifies it in the
      context of broader chaperone-related functions. HSPA1B is a well-established
      ATP-dependent foldase chaperone and the correct molecular function term is
      GO:0044183 (protein folding chaperone).
    action: MODIFY
    reason: >-
      GO:0051082 is being obsoleted. The referenced paper (PMID:16130169) is a
      proteomics study that does not specifically demonstrate unfolded protein
      binding activity for HSPA1B but identifies it among proteins with
      chaperone-related functions. HSPA1B is an established protein folding
      chaperone whose primary molecular function is actively assisting protein
      folding through ATP-dependent cycles, not merely binding unfolded substrates.
      The replacement term GO:0044183 is already supported by direct experimental
      evidence (IDA, PMID:15603737) and phylogenetic inference (IBA, GO_REF:0000033).
    proposed_replacement_terms:
    - id: GO:0044183
      label: protein folding chaperone
    additional_reference_ids:
    - PMID:21231916
    supported_by:
    - reference_id: PMID:16130169
      supporting_text: >-
        The overall functional characterization of the 162 identified proteins
        from primary cultures of HUVECs confirms the metabolic capabilities of
        endothelium and illustrates various cellular functions more related to
        cell motility and angiogenesis, protein folding, anti-oxidant defenses,
        signal transduction, proteasome pathway and resistance to apoptosis.
- term:
    id: GO:0070062
    label: extracellular exosome
  evidence_type: HDA
  original_reference_id: PMID:19199708
  review:
    summary: >-
      PMID:19199708 is a proteomic analysis of human parotid gland exosomes
      identifying HSPA1B among exosome proteins. HSP70 is a commonly identified
      exosomal protein, consistent with extracellular release as described
      in reviews of eHsp70 biology.
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput proteomics data. Exosomal localization of HSP70 is
      well-documented but represents a non-core secondary localization.
- term:
    id: GO:0070062
    label: extracellular exosome
  evidence_type: HDA
  original_reference_id: PMID:20458337
  review:
    summary: >-
      PMID:20458337 identifies MHC class II-associated proteins in B-cell
      exosomes, including HSPA1B. Consistent with known exosomal release
      of HSP70 family members.
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput proteomics data. Exosomal localization is a
      secondary, non-core feature of HSPA1B.
- term:
    id: GO:0070062
    label: extracellular exosome
  evidence_type: HDA
  original_reference_id: PMID:23533145
  review:
    summary: >-
      PMID:23533145 identifies HSPA1B in exosomes isolated from expressed
      prostatic secretions in urine. Consistent with known exosomal HSP70
      release from various cell types.
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput proteomics data. Exosomal localization is non-core.
- term:
    id: GO:1990904
    label: ribonucleoprotein complex
  evidence_type: IDA
  original_reference_id: PMID:17289661
  review:
    summary: >-
      PMID:17289661 identifies HSPA1B as a component of IGF2BP1 (IMP1)
      mRNP granules containing untranslated mRNAs by mass spectrometry.
      UniProt confirms this localization (ECO:0000269|PubMed:17289661).
    action: ACCEPT
    reason: >-
      Confirmed by mass spectrometry identification in mRNP granule complex.
      Consistent with known HSP70 association with RNA granules.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:24318877
  review:
    summary: >-
      PMID:24318877 (Rauch and Gestwicki 2014) characterizes how binding
      of human nucleotide exchange factors (BAG1, BAG2, BAG3, HSPH1)
      to Hsp70 generates functionally distinct complexes. The protein
      binding annotation is uninformative for a chaperone with many
      specific co-chaperone interactions.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone.
      The specific interactions with NEFs are better captured by heat shock
      protein binding (GO:0031072) already annotated.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:27137183
  review:
    summary: >-
      PMID:27137183 shows HSP70 interacts with NEDD1 and gamma-tubulin at
      the mitotic centrosome. Protein binding is uninformative for a
      chaperone that interacts with many client proteins.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone.
      The specific NEDD1 interaction is in the context of centrosome
      function already captured by more specific annotations.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:27708256
  review:
    summary: >-
      PMID:27708256 demonstrates specific interactions between Hsp70 and
      NAA10 (ARD1), HDAC4, HOPX, STUB1, HSP40, and HSP90 in the context
      of acetylation-regulated chaperone switching. Protein binding is
      uninformative for a chaperone with many well-characterized
      co-chaperone interactions.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative. The specific
      interactions with HDAC4, STUB1, HOPX etc. are better captured by
      more specific MF terms already annotated (e.g., histone deacetylase
      binding, ubiquitin protein ligase binding, heat shock protein binding).
- term:
    id: GO:0005813
    label: centrosome
  evidence_type: IDA
  original_reference_id: PMID:27137183
  review:
    summary: >-
      PMID:27137183 directly demonstrates that HSP70 accumulates at the
      mitotic centrosome during prometaphase to metaphase by
      immunofluorescence. UniProt confirms this localization
      (ECO:0000269|PubMed:27137183).
    action: ACCEPT
    reason: >-
      Confirmed by direct assay showing centrosome accumulation during
      mitosis. HSP70 is required for centrosome integrity and bipolar
      spindle assembly.
    supported_by:
    - reference_id: PMID:27137183
      supporting_text: >-
        heat shock protein (HSP) 70 considerably accumulates at the
        mitotic centrosome during prometaphase to metaphase and is
        required for bipolar spindle assembly
- term:
    id: GO:0042026
    label: protein refolding
  evidence_type: IMP
  original_reference_id: PMID:27708256
  review:
    summary: >-
      PMID:27708256 demonstrates that acetylated Hsp70 binds HOPX to
      facilitate protein refolding during the early stress response.
      K77R mutation impairs refolding capacity. Core biological process.
    action: ACCEPT
    reason: >-
      Protein refolding is a core function of HSPA1B, confirmed by
      direct demonstration that the acetylation state regulates the
      refolding vs degradation switch.
    supported_by:
    - reference_id: PMID:27708256
      supporting_text: >-
        During the early stress response, Hsp70 is immediately acetylated
        by ARD1 at K77, and the acetylated Hsp70 binds to the co-chaperone
        Hop to allow protein refolding
- term:
    id: GO:0090063
    label: positive regulation of microtubule nucleation
  evidence_type: IMP
  original_reference_id: PMID:27137183
  review:
    summary: >-
      PMID:27137183 demonstrates that inhibition or depletion of HSP70
      impaired microtubule nucleation and polymerization from the spindle
      pole. HSP70 associates with NEDD1 and gamma-tubulin, two PCM
      components essential for MT nucleation.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally well-supported centrosome-related function during
      mitosis but not a core chaperone function.
    supported_by:
    - reference_id: PMID:27137183
      supporting_text: >-
        Inhibition or depletion of HSP70 impaired the function of mitotic
        centrosome and disrupted MT nucleation and polymerization from the
        spindle pole
- term:
    id: GO:1901673
    label: regulation of mitotic spindle assembly
  evidence_type: IMP
  original_reference_id: PMID:27137183
  review:
    summary: >-
      PMID:27137183 shows HSP70 is required for bipolar spindle assembly.
      Its inhibition disrupts spindle formation and may result in
      formation of abnormal mitotic spindles.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but represents a specific mitotic function
      rather than the core chaperone activity.
    supported_by:
    - reference_id: PMID:27137183
      supporting_text: >-
        HSP70 is required for the maintenance of a functional mitotic
        centrosome that supports the assembly of a bipolar mitotic spindle
- term:
    id: GO:0005576
    label: extracellular region
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-6800434
  review:
    summary: >-
      TAS from Reactome R-HSA-6800434 (exocytosis of ficolin-rich granule
      lumen proteins) describing release of HSP70 into the extracellular
      space during neutrophil degranulation. HSP70 is known to be released
      extracellularly via exosomes and neutrophil granules.
    action: KEEP_AS_NON_CORE
    reason: >-
      Extracellular localization is supported by Reactome and proteomics
      data but is a secondary, cell-type-specific feature.
- term:
    id: GO:1904813
    label: ficolin-1-rich granule lumen
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-6800434
  review:
    summary: >-
      TAS from Reactome R-HSA-6800434 describing HSP70 in ficolin-rich
      granule lumen of neutrophils. Cell-type-specific localization in
      neutrophils.
    action: KEEP_AS_NON_CORE
    reason: >-
      Cell-type-specific localization in neutrophils, supported by
      Reactome but not a core localization for HSPA1B.
- term:
    id: GO:0032757
    label: positive regulation of interleukin-8 production
  evidence_type: IMP
  original_reference_id: PMID:24790089
  review:
    summary: >-
      PMID:24790089 shows induced HSP70 expression increases NOD2 response
      to bacterial cell wall fragments, which leads to NF-kappaB-dependent
      IL-8 production. HSP70 stabilizes NOD2 protein, enhancing its
      signaling capacity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported downstream consequence of HSP70
      stabilization of NOD2, not a core chaperone function.
    supported_by:
    - reference_id: PMID:24790089
      supporting_text: >-
        Induced HSP70 expression in cells increased the response of NOD2
        to bacterial cell wall fragments
- term:
    id: GO:0031396
    label: regulation of protein ubiquitination
  evidence_type: IDA
  original_reference_id: PMID:16809764
  review:
    summary: >-
      PMID:16809764 shows that phosphorylated HDAC8 recruits Hsp70 to a
      complex that inhibits CHIP E3 ligase-mediated degradation of hEST1B.
      HSP70 participates in regulating ubiquitination of client proteins
      through its interaction with CHIP/STUB1.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported regulation of ubiquitination in the context
      of HDAC8-mediated hEST1B stabilization. This is a specific
      downstream consequence of HSP70 chaperone-E3 ligase interaction
      rather than core function.
    supported_by:
    - reference_id: PMID:16809764
      supporting_text: >-
        Phosphorylated HDAC8 preferentially recruits Hsp70 to a complex
        that inhibits the CHIP (C-terminal heat shock protein interacting
        protein) E3 ligase-mediated degradation of hEST1B
- term:
    id: GO:0042826
    label: histone deacetylase binding
  evidence_type: IPI
  original_reference_id: PMID:16809764
  review:
    summary: >-
      PMID:16809764 confirms interaction between HSP70 and HDAC8.
      Phosphorylated HDAC8 recruits Hsp70 to a complex. UniProt also
      documents interaction with HDAC4 (PMID:27708256), which
      deacetylates Hsp70 at Lys-77 to regulate chaperone function.
    action: ACCEPT
    reason: >-
      Confirmed by experimental evidence from multiple studies. HDAC
      binding is functionally relevant to regulation of HSP70 chaperone
      activity through acetylation/deacetylation of Lys-77.
    supported_by:
    - reference_id: PMID:16809764
      supporting_text: >-
        Phosphorylated HDAC8 preferentially recruits
        Hsp70 to a complex that inhibits the CHIP (C-terminal heat shock protein
        interacting protein) E3 ligase-mediated degradation of hEST1B
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371467
  review:
    summary: >-
      TAS from Reactome R-HSA-3371467 (SIRT1 deacetylates HSF1) describing
      HSP70 involvement in the nucleoplasm during HSF1-mediated heat shock
      response regulation. HSP70 shuttles to the nucleus during stress
      via Hikeshi-mediated import.
    action: ACCEPT
    reason: >-
      Nucleoplasm localization is consistent with HSP70 nuclear functions
      during the heat shock response, particularly in HSF1 regulation.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371518
  review:
    summary: >-
      TAS from Reactome R-HSA-3371518 (SIRT1 binds to HSF1) describing
      nucleoplasmic localization of HSP70 in the context of HSF1
      regulation. Redundant with other nucleoplasm TAS annotations.
    action: ACCEPT
    reason: >-
      Consistent with established HSP70 nuclear localization during stress.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371554
  review:
    summary: >-
      TAS from Reactome R-HSA-3371554 (HSF1 acetylation at Lys80)
      describing nucleoplasmic localization of HSP70 during the heat
      shock response attenuation phase.
    action: ACCEPT
    reason: >-
      Consistent with established HSP70 nuclear localization during stress
      and its role in HSF1 regulation.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5082356
  review:
    summary: >-
      TAS from Reactome R-HSA-5082356 (HSF1-mediated gene expression)
      describing nucleoplasmic localization of HSP70 during HSF1-dependent
      transactivation. HSP70 feeds back on HSF1 to attenuate the heat
      shock response.
    action: ACCEPT
    reason: >-
      Consistent with nucleoplasmic localization during HSF1 regulation.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5082369
  review:
    summary: >-
      TAS from Reactome R-HSA-5082369 (acetylated HSF1 dissociates from
      DNA) describing HSP70 nucleoplasmic role in HSF1 attenuation.
    action: ACCEPT
    reason: >-
      Consistent with established nucleoplasmic localization of HSP70
      during stress response regulation.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5082384
  review:
    summary: >-
      TAS from Reactome R-HSA-5082384 (HSP70:DNAJB1 binds HSF1)
      describing HSP70 nucleoplasmic function in the attenuation phase
      of the heat shock response, where HSP70 with DNAJB1 binds to HSF1
      to suppress transcription.
    action: ACCEPT
    reason: >-
      Core nuclear function of HSP70 in regulating HSF1. This is a
      well-established feedback mechanism.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5251955
  review:
    summary: >-
      TAS from Reactome R-HSA-5251955 (HSP40s activate intrinsic ATPase
      activity of HSP70s in the nucleoplasm) describing nucleoplasmic
      HSP70 ATPase cycle driven by J-domain proteins.
    action: ACCEPT
    reason: >-
      Consistent with HSP70 functioning in the nucleoplasm during stress.
- term:
    id: GO:0005654
    label: nucleoplasm
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5252041
  review:
    summary: >-
      TAS from Reactome R-HSA-5252041 (NPC transports Hikeshi:HSP70s:ATP
      from cytosol to nucleoplasm) describing Hikeshi-mediated nuclear
      import of HSP70 during heat shock.
    action: ACCEPT
    reason: >-
      Consistent with the established Hikeshi-dependent HSP70 nuclear
      import mechanism under stress conditions.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371422
  review:
    summary: >-
      TAS from Reactome R-HSA-3371422 (ATP hydrolysis by HSP70) describing
      cytosolic HSP70 ATPase activity. Core localization for HSPA1B.
    action: ACCEPT
    reason: >-
      Core localization. Cytosol is the primary site of HSP70 chaperone
      activity, consistent with IBA and IDA annotations.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371503
  review:
    summary: >-
      TAS from Reactome R-HSA-3371503 (STIP1/HOP binds HSP90 and
      HSP70:HSP40:nascent protein) describing cytosolic HSP70 in the
      HSP70-HSP90 chaperone relay.
    action: ACCEPT
    reason: >-
      Core localization. Cytosolic HSP70-HSP90 relay is a well-established
      chaperone pathway.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-3371590
  review:
    summary: >-
      TAS from Reactome R-HSA-3371590 (HSP70 binds to HSP40:nascent
      protein) describing cytosolic HSP70 initial substrate engagement.
    action: ACCEPT
    reason: >-
      Core localization. HSP70 engagement with HSP40-bound nascent
      proteins occurs in the cytosol.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5251942
  review:
    summary: >-
      TAS from Reactome R-HSA-5251942 (Hikeshi binds HSP70s:ATP)
      describing cytosolic HSP70:ATP binding to Hikeshi for nuclear
      import during heat stress.
    action: ACCEPT
    reason: >-
      Core localization. HSP70 is cytosolic prior to Hikeshi-mediated
      nuclear transport.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5251959
  review:
    summary: >-
      TAS from Reactome R-HSA-5251959 (HSP40s activate intrinsic ATPase
      activity of HSP70s in the cytosol) describing cytosolic HSP70
      ATPase cycle activation by J-domain proteins.
    action: ACCEPT
    reason: >-
      Core localization. Cytosolic chaperone cycle activation is a
      central function of HSP70.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5252041
  review:
    summary: >-
      TAS from Reactome R-HSA-5252041 (NPC transports Hikeshi:HSP70s:ATP
      from cytosol to nucleoplasm) describing cytosolic origin of HSP70
      prior to nuclear import.
    action: ACCEPT
    reason: >-
      Core localization. HSP70 is cytosolic prior to nuclear import.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5252079
  review:
    summary: >-
      TAS from Reactome R-HSA-5252079 (HSP110s exchange ATP for ADP on
      HSP70s:ADP) describing cytosolic nucleotide exchange on HSP70 by
      HSP110 nucleotide exchange factors.
    action: ACCEPT
    reason: >-
      Core localization. NEF-mediated nucleotide exchange occurs in the
      cytosol as part of the chaperone cycle.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5618085
  review:
    summary: >-
      TAS from Reactome R-HSA-5618085 (FKBP4 binds HSP90:ATP:STIP1:HSP70:
      nascent protein) describing cytosolic HSP70 in the HSP90 chaperone
      cycle for steroid hormone receptors.
    action: ACCEPT
    reason: >-
      Core localization. Cytosolic HSP70 participates in HSP90 chaperone
      relay for client protein maturation.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5618098
  review:
    summary: >-
      TAS from Reactome R-HSA-5618098 (p23/PTGES3 binds HSP90:ATP:FKBP5:
      nascent protein) describing cytosolic localization of HSP70 during
      HSP90 chaperone cycle.
    action: ACCEPT
    reason: >-
      Core localization in the cytosol during HSP90 chaperone cycle.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5618105
  review:
    summary: >-
      TAS from Reactome R-HSA-5618105 (FKBP5 binds HSP90:ATP:STIP1:HSP70:
      nascent protein) describing cytosolic HSP70 in HSP90 chaperone cycle.
    action: ACCEPT
    reason: >-
      Core localization in the cytosol.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5618107
  review:
    summary: >-
      TAS from Reactome R-HSA-5618107 (ATP binding to HSP90 triggers
      conformation change) describing cytosolic localization of HSP70 in
      the context of HSP90 chaperone machinery.
    action: ACCEPT
    reason: >-
      Core localization in the cytosol.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-5618110
  review:
    summary: >-
      TAS from Reactome R-HSA-5618110 (p23/PTGES3 binds HSP90:ATP:FKBP4:
      nascent protein) describing cytosolic localization of HSP70 during
      HSP90 chaperone cycle maturation steps.
    action: ACCEPT
    reason: >-
      Core localization in the cytosol.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-9835411
  review:
    summary: >-
      TAS from Reactome R-HSA-9835411 (FA core complex:HSP70s binds PKR)
      describing cytosolic HSP70 involvement in PKR-mediated signaling.
    action: ACCEPT
    reason: >-
      Core localization in the cytosol.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: TAS
  original_reference_id: Reactome:R-HSA-9857076
  review:
    summary: >-
      TAS from Reactome R-HSA-9857076 (oxidized DNAJA1 binds HSPA1A,B
      displacing HSF1) describing cytosolic HSP70 involved in
      redox-sensitive HSF1 regulation.
    action: ACCEPT
    reason: >-
      Core localization in the cytosol.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:22528486
  review:
    summary: >-
      PMID:22528486 identifies HSP70 as an ATF5-interacting protein.
      NPM1 displaces HSP70 from ATF5, leading to ATF5 degradation.
      The HSP70-ATF5 interaction reflects chaperone client stabilization.
      Protein binding is uninformative for a chaperone.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular chaperone.
      The ATF5 interaction is a specific client stabilization function
      better captured by protein stabilization (GO:0050821) already annotated.
    supported_by:
    - reference_id: PMID:22528486
      supporting_text: >-
        NPM1 interaction with ATF5 displaces HSP70, a known ATF5-interacting
        protein, from ATF5 protein complexes and antagonizes its role in
        stabilization of ATF5 protein
- term:
    id: GO:0055131
    label: C3HC4-type RING finger domain binding
  evidence_type: IPI
  original_reference_id: PMID:25281747
  review:
    summary: >-
      PMID:25281747 demonstrates that coexpression of RNF207 and HSP70
      increases HERG expression in a heat shock protein-dependent manner.
      RNF207 is a RING finger protein that interacts with HSP70 via its
      C-terminus.
    action: ACCEPT
    reason: >-
      Confirmed by experimental evidence showing HSP70 interaction with
      the RING finger protein RNF207 to regulate HERG trafficking.
    supported_by:
    - reference_id: PMID:25281747
      supporting_text: >-
        coexpression of RNF207 and HSP70 increased HERG expression compared
        with HSP70 alone. This effect was dependent on the C terminus of RNF207
- term:
    id: GO:0031072
    label: heat shock protein binding
  evidence_type: IPI
  original_reference_id: PMID:17182002
  review:
    summary: >-
      PMID:17182002 shows DNAJC9 (HDJC9), a novel type C DnaJ/HSP40
      member, interacts with and cochaperones HSP70 through the J domain.
      DNAJC9 activates the ATPase activity of HSP70.
    action: ACCEPT
    reason: >-
      Core co-chaperone interaction. J-domain protein (DNAJC9) binding to
      HSP70 is fundamental to the chaperone cycle.
    supported_by:
    - reference_id: PMID:17182002
      supporting_text: >-
        HDJC9 can interact with HSP70s and activate the ATPase activity of
        HSP70s, both of which are dependent on the J domain
- term:
    id: GO:0001664
    label: G protein-coupled receptor binding
  evidence_type: IDA
  original_reference_id: PMID:12150907
  review:
    summary: >-
      PMID:12150907 shows CHIP, Hsp70, Parkin, and unfolded Pael-R (an
      orphan GPCR) form a complex. Hsp70 binds Pael-R as a chaperone
      substrate, not as a GPCR signaling partner.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      While HSPA1B does bind the GPCR Pael-R, this is in the context of
      chaperone-substrate interaction for an unfolded receptor, not GPCR
      signaling. The term implies specific binding to GPCRs as signaling
      partners.
    supported_by:
    - reference_id: PMID:12150907
      supporting_text: >-
        CHIP, Hsp70, Parkin, and Pael-R formed a complex in vitro and
        in vivo
- term:
    id: GO:0031397
    label: negative regulation of protein ubiquitination
  evidence_type: IDA
  original_reference_id: PMID:12150907
  review:
    summary: >-
      PMID:12150907 demonstrates that Hsp70 binding to Pael-R can shield
      the substrate from ubiquitination. CHIP promotes dissociation of
      Hsp70 from the complex, facilitating Parkin-mediated ubiquitination.
      HSP70 thus negatively regulates ubiquitination by sequestering
      substrates from E3 ligases.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but represents a context-dependent
      regulatory outcome of chaperone activity on substrate triage.
    supported_by:
    - reference_id: PMID:12150907
      supporting_text: >-
        CHIP promoted the dissociation of Hsp70 from Parkin and Pael-R,
        thus facilitating Parkin-mediated Pael-R ubiquitination
- term:
    id: GO:0031625
    label: ubiquitin protein ligase binding
  evidence_type: IPI
  original_reference_id: PMID:12150907
  review:
    summary: >-
      PMID:12150907 demonstrates that Hsp70 forms a complex with CHIP
      (an E3 ubiquitin ligase) and Parkin (an E3 ubiquitin ligase) in
      the context of Pael-R ubiquitination. HSP70 directly binds E3
      ligases as part of its chaperone triage function.
    action: ACCEPT
    reason: >-
      Core co-chaperone interaction. HSP70 binding to E3 ubiquitin ligases
      like CHIP/STUB1 and Parkin is integral to the protein quality
      control triage mechanism.
    supported_by:
    - reference_id: PMID:12150907
      supporting_text: >-
        CHIP, Hsp70, Parkin, and Pael-R formed a complex in vitro and
        in vivo
- term:
    id: GO:0034599
    label: cellular response to oxidative stress
  evidence_type: TAS
  original_reference_id: PMID:24252804
  review:
    summary: >-
      TAS from PMID:24252804 (a review of the role of oxidative stress
      in Parkinson disease pathogenesis) supporting HSP70 involvement
      in oxidative stress response. HSP70 is induced by and participates
      in oxidative stress response.
    action: KEEP_AS_NON_CORE
    reason: >-
      HSP70 is induced by and participates in oxidative stress response,
      but this is a general stress-responsive phenotype rather than a
      core chaperone function.
- term:
    id: GO:0050821
    label: protein stabilization
  evidence_type: TAS
  original_reference_id: PMID:24252804
  review:
    summary: >-
      TAS from PMID:24252804 supporting HSP70 protein stabilization
      function in the context of Parkinson disease. HSP70 chaperone
      activity inherently stabilizes client proteins. PMID:24790089
      directly demonstrates HSP70 stabilizes NOD2 by increasing its
      half-life.
    action: ACCEPT
    reason: >-
      Well-supported core function. HSP70 chaperone activity inherently
      stabilizes client proteins, preventing misfolding and degradation.
- term:
    id: GO:0051082
    label: unfolded protein binding
  evidence_type: NAS
  original_reference_id: PMID:12150907
  review:
    summary: >-
      GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962).
      This NAS annotation references PMID:12150907 (Imai et al. 2002), which
      describes how CHIP, Hsp70, Parkin, and unfolded Pael receptor (Pael-R)
      form a complex involved in ER stress-related ubiquitination. The paper
      demonstrates that Hsp70 participates in a chaperone-E3 ligase complex
      facilitating ubiquitination of the unfolded substrate Pael-R, consistent
      with Hsp70 functioning as a protein folding chaperone that triages
      substrates between refolding and degradation pathways. HSPA1B is an
      ATP-dependent foldase chaperone and the correct replacement term is
      GO:0044183 (protein folding chaperone).
    action: MODIFY
    reason: >-
      GO:0051082 is being obsoleted. The referenced paper (PMID:12150907)
      describes Hsp70 participating in a complex with CHIP and Parkin for
      ubiquitination of unfolded Pael-R, which reflects Hsp70 chaperone triage
      function rather than simple unfolded protein binding. HSPA1B is an active
      ATP-dependent protein folding chaperone whose substrate binding is coupled
      to its ATPase cycle. GO:0044183 (protein folding chaperone) correctly
      captures the molecular function.
    proposed_replacement_terms:
    - id: GO:0044183
      label: protein folding chaperone
    additional_reference_ids:
    - PMID:21231916
    supported_by:
    - reference_id: PMID:12150907
      supporting_text: >-
        CHIP, Hsp70, Parkin, and Pael-R formed a complex in vitro and in vivo.
        The amount of CHIP in the complex was increased during ER stress. CHIP
        promoted the dissociation of Hsp70 from Parkin and Pael-R, thus
        facilitating Parkin-mediated Pael-R ubiquitination.
- term:
    id: GO:0005814
    label: centriole
  evidence_type: IDA
  original_reference_id: PMID:24061851
  review:
    summary: >-
      PMID:24061851 documents stress-induced localization of HSPA1A
      (functionally identical to HSPA1B) to centrioles in human neuronal
      cells. Consistent with HSP70 centrosome function during stress.
    action: ACCEPT
    reason: >-
      Confirmed by direct assay showing stress-induced centriole
      localization in neuronal cells.
- term:
    id: GO:0005829
    label: cytosol
  evidence_type: IDA
  original_reference_id: PMID:21231916
  review:
    summary: >-
      PMID:21231916 (Hageman et al. 2011) characterized HSP70 family
      members in the cytosol, demonstrating cytosolic chaperone activities
      including luciferase refolding and polyQ aggregation suppression.
    action: ACCEPT
    reason: >-
      Core localization confirmed by direct assay. Cytosol is the primary
      site of HSP70 chaperone function.
- term:
    id: GO:0005925
    label: focal adhesion
  evidence_type: HDA
  original_reference_id: PMID:21423176
  review:
    summary: >-
      PMID:21423176 is a proteomic analysis of the myosin-II-responsive
      focal adhesion proteome that identified HSPA1B among focal adhesion
      proteins.
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput proteomics data. Focal adhesion localization is a
      secondary, context-dependent feature, not a core localization for
      HSP70.
- term:
    id: GO:0031072
    label: heat shock protein binding
  evidence_type: IPI
  original_reference_id: PMID:21231916
  review:
    summary: >-
      PMID:21231916 demonstrates functional interactions between HSP70
      family members and various J-domain protein co-chaperones (HSP40s).
      HSPA1A ATPase activity is stimulated by J-proteins.
    action: ACCEPT
    reason: >-
      Core co-chaperone interaction. HSP70-HSP40 (J-protein) interactions
      are fundamental to the chaperone cycle.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        HSPA6 has a functional substrate-binding domain and possesses
        intrinsic ATPase activity that is as high as that of the canonical
        HSPA1A when stimulated by J-proteins
- term:
    id: GO:0034605
    label: cellular response to heat
  evidence_type: IDA
  original_reference_id: PMID:24061851
  review:
    summary: >-
      PMID:24061851 demonstrates stress-induced localization changes of
      HSPA1A to centrioles in human neuronal cells, showing a direct
      cellular response to heat stress.
    action: ACCEPT
    reason: >-
      Core stress-response function. HSPA1B is heat-inducible and
      directly responds to heat stress by changing its subcellular
      localization and activity.
- term:
    id: GO:0042026
    label: protein refolding
  evidence_type: IDA
  original_reference_id: PMID:21231916
  review:
    summary: >-
      PMID:21231916 directly demonstrates that HSPA1A (functionally
      identical to HSPA1B) supports luciferase refolding after heat
      denaturation. Core biological process for HSP70.
    action: ACCEPT
    reason: >-
      Core biological process confirmed by direct assay showing
      heat-denatured luciferase refolding activity.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        Overexpressed chaperones that suppressed polyQ aggregation were
        found not to be able to stimulate luciferase refolding. Inversely,
        chaperones that supported luciferase refolding were poor
        suppressors of polyQ aggregation
- term:
    id: GO:0051082
    label: unfolded protein binding
  evidence_type: IDA
  original_reference_id: PMID:21231916
  review:
    summary: >-
      GO:0051082 (unfolded protein binding) is being obsoleted (go-ontology#30962).
      This IDA annotation references PMID:21231916 (Hageman et al. 2011), a key
      study that systematically compared chaperone activities of mammalian HSP70
      family members. The study demonstrated that HSPA1A (>99% identical to
      HSPA1B) possesses robust luciferase refolding activity and protects cells
      from heat-induced cell death. While the study does demonstrate that
      HSPA1A/HSPA1B can bind heat-denatured substrates, this binding is
      intrinsically coupled to the ATP-dependent chaperone folding cycle. The
      correct molecular function term is GO:0044183 (protein folding chaperone),
      which captures the active chaperone function rather than the passive
      substrate-binding aspect that GO:0051082 implies.
    action: MODIFY
    reason: >-
      GO:0051082 is being obsoleted. PMID:21231916 directly demonstrates that
      HSPA1A (functionally identical to HSPA1B) is an active ATP-dependent
      foldase that refolds heat-denatured luciferase and suppresses protein
      aggregation. The binding of unfolded substrates by HSP70 is mechanistically
      inseparable from its chaperone folding cycle. GO:0044183 (protein folding
      chaperone) is the correct replacement and is already annotated to HSPA1B
      via IDA (PMID:15603737) and IBA (GO_REF:0000033) evidence.
    proposed_replacement_terms:
    - id: GO:0044183
      label: protein folding chaperone
    additional_reference_ids:
    - PMID:24012426
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        HSPA6 has a functional substrate-binding domain and possesses intrinsic
        ATPase activity that is as high as that of the canonical HSPA1A when
        stimulated by J-proteins.
    - reference_id: PMID:21231916
      supporting_text: >-
        whereas overexpression of HSPA1A protected cells from heat-induced cell
        death, overexpression of HSPA6 did not
- term:
    id: GO:0070370
    label: cellular heat acclimation
  evidence_type: IMP
  original_reference_id: PMID:21231916
  review:
    summary: >-
      PMID:21231916 confirms that HSPA1A (functionally identical to
      HSPA1B) protects cells from heat-induced cell death. Overexpression
      of HSPA1A conferred thermotolerance whereas HSPA6 did not.
    action: ACCEPT
    reason: >-
      Core stress-response function. HSPA1B is heat-inducible and
      protects cells during heat stress, directly contributing to
      cellular heat acclimation.
    supported_by:
    - reference_id: PMID:21231916
      supporting_text: >-
        whereas overexpression of HSPA1A protected cells from
        heat-induced cell death, overexpression of HSPA6 did not
- term:
    id: GO:0072562
    label: blood microparticle
  evidence_type: HDA
  original_reference_id: PMID:22516433
  review:
    summary: >-
      PMID:22516433 is a proteomic analysis of microvesicles from plasma
      of healthy donors identifying HSPA1B among blood microparticle
      proteins. Consistent with known extracellular release of HSP70.
    action: KEEP_AS_NON_CORE
    reason: >-
      High-throughput proteomics data. Blood microparticle localization
      is a secondary, non-core feature consistent with extracellular
      HSP70 release.
- term:
    id: GO:0090084
    label: negative regulation of inclusion body assembly
  evidence_type: IDA
  original_reference_id: PMID:21231916
  review:
    summary: >-
      PMID:21231916 demonstrates that HSPA1A (functionally identical to
      HSPA1B) suppresses polyQ aggregation and inclusion body formation.
      Core protein quality control function.
    action: ACCEPT
    reason: >-
      Core chaperone function. Preventing protein aggregation and
      inclusion body formation is a direct consequence of HSP70 foldase
      and holdase activity.
- term:
    id: GO:0005515
    label: protein binding
  evidence_type: IPI
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 shows BAG5 directly interacts with Hsp70 and inhibits
      Hsp70-mediated refolding of misfolded proteins. Protein binding is
      uninformative for a chaperone.
    action: MARK_AS_OVER_ANNOTATED
    reason: >-
      GO:0005515 protein binding is uninformative for a molecular
      chaperone. The BAG5 interaction is a specific co-chaperone
      interaction better captured by heat shock protein binding
      (GO:0031072).
    supported_by:
    - reference_id: PMID:15603737
      supporting_text: >-
        bcl-2-associated athanogene 5 (BAG5), a BAG family
        member, directly interacts with parkin and the chaperone Hsp70. Within this
        complex, BAG5 inhibits both parkin E3 ubiquitin ligase activity and
        Hsp70-mediated refolding of misfolded proteins
- term:
    id: GO:0005524
    label: ATP binding
  evidence_type: IDA
  original_reference_id: PMID:23921388
  review:
    summary: >-
      PMID:23921388 characterizes METTL21A methylation of HSP70, with
      the methylation reaction stimulated by ATP, demonstrating HSP70
      ATP binding. Core molecular function confirmed by crystal structures
      of the NBD domain with ADP/ATP.
    action: ACCEPT
    reason: >-
      Core molecular function. ATP binding drives the chaperone cycle and
      is essential for all HSP70 functions.
    supported_by:
    - reference_id: PMID:23921388
      supporting_text: >-
        the reaction was stimulated by ATP
- term:
    id: GO:0010628
    label: positive regulation of gene expression
  evidence_type: IMP
  original_reference_id: PMID:25281747
  review:
    summary: >-
      PMID:25281747 shows that coexpression of RNF207 and HSP70 increased
      HERG expression, suggesting HSP70 participates in positive
      regulation of gene expression for specific client proteins through
      its chaperone activity on trafficking.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but a downstream consequence of HSP70
      chaperone-mediated protein trafficking/stabilization in the cardiac
      context, not a core gene expression regulatory function.
    supported_by:
    - reference_id: PMID:25281747
      supporting_text: >-
        coexpression of RNF207 and HSP70 increased HERG expression compared
        with HSP70 alone
- term:
    id: GO:0016234
    label: inclusion body
  evidence_type: IDA
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 shows BAG5 enhances parkin sequestration within
      protein aggregates, with HSP70 localized to inclusion bodies as
      part of its protein quality control response.
    action: ACCEPT
    reason: >-
      Confirmed by direct assay. HSP70 localizes to inclusion bodies as
      part of its role in protein aggregate management and quality control.
    supported_by:
    - reference_id: PMID:15603737
      supporting_text: >-
        BAG5 enhances parkin sequestration within protein aggregates and
        mitigates parkin-dependent preservation of proteasome function
- term:
    id: GO:0019899
    label: enzyme binding
  evidence_type: IPI
  original_reference_id: PMID:23921388
  review:
    summary: >-
      PMID:23921388 demonstrates METTL21A (HSPA-KMT) is a highly specific
      methyltransferase that interacts with and methylates HSP70 family
      members. Enzyme binding is confirmed by the direct
      enzyme-substrate interaction.
    action: ACCEPT
    reason: >-
      Confirmed by experimental evidence. METTL21A is a specific enzyme
      that binds and modifies HSP70 at Lys-561.
    supported_by:
    - reference_id: PMID:23921388
      supporting_text: >-
        we identified the methyltransferase METTL21A as the enzyme
        responsible for trimethylation of a conserved lysine residue found
        in several human Hsp70 (HSPA) proteins
- term:
    id: GO:0031072
    label: heat shock protein binding
  evidence_type: IPI
  original_reference_id: PMID:23921388
  review:
    summary: >-
      PMID:23921388 demonstrates that METTL21A trimethylation alters the
      affinity of Hsp70 for alpha-synuclein fibrils, reflecting
      functionally relevant HSP-HSP interactions. The study also shows
      METTL21A interacts with HSP70 family members.
    action: ACCEPT
    reason: >-
      Core co-chaperone interaction. HSP70 binding to other heat shock
      proteins and modifiers is fundamental to chaperone regulation.
- term:
    id: GO:0031625
    label: ubiquitin protein ligase binding
  evidence_type: IPI
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 demonstrates that BAG5 directly interacts with both
      parkin (an E3 ubiquitin ligase) and Hsp70, forming a complex.
      HSP70 binding to E3 ligases is a core part of the chaperone triage
      system.
    action: ACCEPT
    reason: >-
      Core co-chaperone interaction. HSP70 binding to E3 ubiquitin
      ligases like Parkin is integral to the protein quality control
      triage mechanism.
    supported_by:
    - reference_id: PMID:15603737
      supporting_text: >-
        bcl-2-associated athanogene 5 (BAG5), a BAG family member, directly
        interacts with parkin and the chaperone Hsp70
- term:
    id: GO:0042026
    label: protein refolding
  evidence_type: IDA
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 demonstrates Hsp70-mediated refolding of misfolded
      proteins, which is inhibited by BAG5. Core biological process for
      HSP70.
    action: ACCEPT
    reason: >-
      Core biological process confirmed by direct assay. HSP70 refolds
      misfolded proteins through its ATP-dependent chaperone cycle.
    supported_by:
    - reference_id: PMID:15603737
      supporting_text: >-
        BAG5 inhibits both parkin E3 ubiquitin ligase activity and
        Hsp70-mediated refolding of misfolded proteins
- term:
    id: GO:0044183
    label: protein folding chaperone
  evidence_type: IDA
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 demonstrates Hsp70 chaperone activity in the context
      of the BAG5-Parkin-Hsp70 complex. Hsp70 actively refolds misfolded
      proteins. This is the core molecular function annotation for HSPA1B.
    action: ACCEPT
    reason: >-
      The defining molecular function of HSPA1B. HSP70 is an
      ATP-dependent protein folding chaperone confirmed by direct assay.
    supported_by:
    - reference_id: PMID:15603737
      supporting_text: >-
        BAG5 inhibits both parkin E3 ubiquitin ligase activity and
        Hsp70-mediated refolding of misfolded proteins
- term:
    id: GO:0046034
    label: ATP metabolic process
  evidence_type: IDA
  original_reference_id: PMID:23921388
  review:
    summary: >-
      PMID:23921388 confirms ATP-dependent activity of HSP70 in the
      context of METTL21A methylation studies. HSP70 hydrolyzes ATP as
      part of its chaperone cycle.
    action: ACCEPT
    reason: >-
      Core function. ATP metabolic process is an inherent aspect of the
      ATPase-driven chaperone cycle.
- term:
    id: GO:0048471
    label: perinuclear region of cytoplasm
  evidence_type: IDA
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 documents perinuclear localization of HSP70 in the
      context of dopaminergic neuron studies with BAG5 and Parkin.
      Consistent with perinuclear HSP70 localization during stress.
    action: ACCEPT
    reason: >-
      Confirmed by direct assay. Perinuclear localization is observed
      particularly in the context of protein quality control near the
      nucleus.
- term:
    id: GO:0090084
    label: negative regulation of inclusion body assembly
  evidence_type: IDA
  original_reference_id: PMID:15603737
  review:
    summary: >-
      PMID:15603737 shows HSP70 suppresses protein aggregation and
      inclusion body formation, which is inhibited by BAG5. Core protein
      quality control function.
    action: ACCEPT
    reason: >-
      Core chaperone function. Preventing protein aggregation and
      inclusion body formation is a direct consequence of HSP70 foldase
      activity.
- term:
    id: GO:2001240
    label: negative regulation of extrinsic apoptotic signaling pathway in absence
      of ligand
  evidence_type: IMP
  original_reference_id: PMID:17167422
  review:
    summary: >-
      PMID:17167422 shows Hsp70 protects GATA-1 from caspase-3 cleavage,
      preventing apoptosis during erythroid differentiation. This is a
      specific anti-apoptotic function mediated through chaperone
      protection of GATA-1.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported anti-apoptotic function but represents a
      specific downstream effect of HSP70 chaperone-mediated protection
      of client proteins from caspase cleavage.
- term:
    id: GO:0005102
    label: signaling receptor binding
  evidence_type: IPI
  original_reference_id: PMID:24790089
  review:
    summary: >-
      PMID:24790089 demonstrates HSP70 binds NOD2, an intracellular
      pattern recognition receptor. This interaction stabilizes NOD2 and
      enhances its signaling capacity.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported but reflects chaperone-client stabilization
      of NOD2 rather than specific signaling receptor binding activity.
      The interaction is in the context of HSP70 chaperone function.
    supported_by:
    - reference_id: PMID:24790089
      supporting_text: >-
        We identified heat shock protein 70 (HSP70) as a protein
        interactor of both wild type and Crohn mutant NOD2
- term:
    id: GO:0005737
    label: cytoplasm
  evidence_type: IDA
  original_reference_id: PMID:24790089
  review:
    summary: >-
      PMID:24790089 documents cytoplasmic localization of HSP70 in the
      context of NOD2 interaction studies. Core localization for HSPA1B.
    action: ACCEPT
    reason: >-
      Core localization confirmed by direct assay.
- term:
    id: GO:1903265
    label: positive regulation of tumor necrosis factor-mediated signaling pathway
  evidence_type: IMP
  original_reference_id: PMID:24790089
  review:
    summary: >-
      PMID:24790089 shows HSP70 stabilizes NOD2, enhancing NOD2-mediated
      signaling which includes TNF-mediated pathway activation in
      response to bacterial cell wall fragments.
    action: KEEP_AS_NON_CORE
    reason: >-
      Experimentally supported downstream effect of HSP70 chaperone
      activity on innate immune signaling components through NOD2
      stabilization.
    supported_by:
    - reference_id: PMID:24790089
      supporting_text: >-
        Induced HSP70 expression in cells increased the response of NOD2
        to bacterial cell wall fragments
core_functions:
- molecular_function:
    id: GO:0044183
    label: protein folding chaperone
  description: >-
    ATP-dependent foldase chaperone that assists folding of newly synthesized
    polypeptides and refolding of stress-denatured proteins. HSPA1B has the
    conserved tripartite HSP70 architecture: the N-terminal NBD binds and
    hydrolyzes ATP, allosterically driving an open-to-closed conformational
    transition of the SBD lid that regulates client binding and release
    (DOI:10.3390/biom13020272). HSP40/DNAJ co-chaperones stimulate ATP
    hydrolysis and deliver substrates, while nucleotide exchange factors
    (BAG1/2/3, HSPH1/HSP110) accelerate ADP-to-ATP exchange to trigger
    client release (DOI:10.3390/biom13020272). HSPA1B triages substrates
    between refolding (via HOPX/STIP1 co-chaperone) and proteasomal
    degradation (via STUB1/CHIP E3 ubiquitin ligase), with the acetylation
    state of Lys-77 governing this switch. Under stress, expression can
    reach approximately 15% of total cellular protein
    (DOI:10.3390/biom13020272). HSP70 cooperates with HSP90 in client
    maturation pathways and also participates in disaggregation of protein
    aggregates through cooperation with HSP110 as a disaggregase NEF
    (DOI:10.3390/biom13020272).
  directly_involved_in:
  - id: GO:0042026
    label: protein refolding
  - id: GO:0032436
    label: positive regulation of proteasomal ubiquitin-dependent protein catabolic
      process
  - id: GO:0070370
    label: cellular heat acclimation
  - id: GO:0090084
    label: negative regulation of inclusion body assembly
  locations:
  - id: GO:0005829
    label: cytosol
  - id: GO:0005634
    label: nucleus
- molecular_function:
    id: GO:0140545
    label: ATP-dependent protein disaggregase activity
  description: >-
    Works with co-chaperones (notably HSP110/HSPH1 and DNAJB1) to solubilize
    and disaggregate ordered protein aggregates, including alpha-synuclein
    fibrils. This disaggregase activity is driven by the same ATP hydrolysis
    cycle as the foldase function but is directed toward pre-formed aggregates
    rather than nascent or stress-denatured monomers. Recent reviews position
    HSP110-family proteins as major NEFs/co-chaperones that cooperate with
    HSP70 and HSP40 to disaggregate and refold denatured proteins
    (DOI:10.3390/biom13040604).
  directly_involved_in:
  - id: GO:0090084
    label: negative regulation of inclusion body assembly
  locations:
  - id: GO:0005829
    label: cytosol
references:
- id: GO_REF:0000033
  title: Annotation inferences using phylogenetic trees
  findings: []
- id: GO_REF:0000043
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot keyword mapping
  findings: []
- id: GO_REF:0000044
  title: Gene Ontology annotation based on UniProtKB/Swiss-Prot Subcellular Location
    vocabulary mapping, accompanied by conservative changes to GO terms applied by
    UniProt
  findings: []
- id: GO_REF:0000052
  title: Gene Ontology annotation based on curation of immunofluorescence data
  findings: []
- id: GO_REF:0000108
  title: Automatic assignment of GO terms using logical inference, based on on inter-ontology
    links
  findings: []
- id: GO_REF:0000117
  title: Electronic Gene Ontology annotations created by ARBA machine learning models
  findings: []
- id: GO_REF:0000120
  title: Combined Automated Annotation using Multiple IEA Methods
  findings: []
- id: PMID:10205060
  title: Control of mRNA decay by heat shock-ubiquitin-proteasome pathway.
  findings: []
- id: PMID:10859165
  title: Chaperone hsp27 inhibits translation during heat shock by binding eIF4G and
    facilitating dissociation of cap-initiation complexes.
  findings: []
- id: PMID:12150907
  title: CHIP is associated with Parkin, a gene responsible for familial Parkinson's
    disease, and enhances its ubiquitin ligase activity.
  findings: []
- id: PMID:15603737
  title: BAG5 inhibits parkin and enhances dopaminergic neuron degeneration.
  findings: []
- id: PMID:15671022
  title: Heat shock protein 70 inhibits alpha-synuclein fibril formation via preferential
    binding to prefibrillar species.
  findings: []
- id: PMID:15885686
  title: TRIM37 defective in mulibrey nanism is a novel RING finger ubiquitin E3 ligase.
  findings: []
- id: PMID:16130169
  title: Proteomics of human umbilical vein endothelial cells applied to etoposide-induced
    apoptosis.
  findings: []
- id: PMID:16809764
  title: Histone deacetylase 8 safeguards the human ever-shorter telomeres 1B (hEST1B)
    protein from ubiquitin-mediated degradation.
  findings: []
- id: PMID:17167422
  title: Hsp70 regulates erythropoiesis by preventing caspase-3-mediated cleavage
    of GATA-1.
  findings: []
- id: PMID:17182002
  title: HDJC9, a novel human type C DnaJ/HSP40 member interacts with and cochaperones
    HSP70 through the J domain.
  findings: []
- id: PMID:17289661
  title: Molecular composition of IMP1 ribonucleoprotein granules.
  findings: []
- id: PMID:18975920
  title: Interactions between Hsp70 and the hydrophobic core of alpha-synuclein inhibit
    fibril assembly.
  findings: []
- id: PMID:19190083
  title: 'Characterization of exosome-like vesicles released from human tracheobronchial
    ciliated epithelium: a possible role in innate defense.'
  findings: []
- id: PMID:19199708
  title: Proteomic analysis of human parotid gland exosomes by multidimensional protein
    identification technology (MudPIT).
  findings: []
- id: PMID:20458337
  title: MHC class II-associated proteins in B-cell exosomes and potential functional
    implications for exosome biogenesis.
  findings: []
- id: PMID:21081504
  title: ChChd3, an inner mitochondrial membrane protein, is essential for maintaining
    crista integrity and mitochondrial function.
  findings: []
- id: PMID:21231916
  title: The diverse members of the mammalian HSP70 machine show distinct chaperone-like
    activities.
  findings: []
- id: PMID:21423176
  title: Analysis of the myosin-II-responsive focal adhesion proteome reveals a role
    for β-Pix in negative regulation of focal adhesion maturation.
  findings: []
- id: PMID:22516433
  title: Proteomic analysis of microvesicles from plasma of healthy donors reveals
    high individual variability.
  findings: []
- id: PMID:22528486
  title: Nucleophosmin (NPM1/B23) interacts with activating transcription factor 5
    (ATF5) protein and promotes proteasome- and caspase-dependent ATF5 degradation
    in hepatocellular carcinoma cells.
  findings: []
- id: PMID:22658674
  title: Insights into RNA biology from an atlas of mammalian mRNA-binding proteins.
  findings: []
- id: PMID:22681889
  title: The mRNA-bound proteome and its global occupancy profile on protein-coding
    transcripts.
  findings: []
- id: PMID:23349634
  title: A newly uncovered group of distantly related lysine methyltransferases preferentially
    interact with molecular chaperones to regulate their activity.
  findings: []
- id: PMID:23533145
  title: In-depth proteomic analyses of exosomes isolated from expressed prostatic
    secretions in urine.
  findings: []
- id: PMID:23921388
  title: Identification and characterization of a novel human methyltransferase modulating
    Hsp70 protein function through lysine methylation.
  findings: []
- id: PMID:24061851
  title: Stress-induced localization of HSPA6 (HSP70B') and HSPA1A (HSP70-1) proteins
    to centrioles in human neuronal cells.
  findings: []
- id: PMID:24252804
  title: The role of oxidative stress in Parkinson's disease.
  findings: []
- id: PMID:24318877
  title: Binding of human nucleotide exchange factors to heat shock protein 70 (Hsp70)
    generates functionally distinct complexes in vitro.
  findings: []
- id: PMID:24790089
  title: The molecular chaperone HSP70 binds to and stabilizes NOD2, an important
    protein involved in Crohn disease.
  findings: []
- id: PMID:25281747
  title: RING finger protein RNF207, a novel regulator of cardiac excitation.
  findings: []
- id: PMID:27133716
  title: A novel nuclear DnaJ protein, DNAJC8, can suppress the formation of spinocerebellar
    ataxia 3 polyglutamine aggregation in a J-domain independent manner.
  findings: []
- id: PMID:27137183
  title: HSP70 regulates the function of mitotic centrosomes.
  findings: []
- id: PMID:27708256
  title: ARD1-mediated Hsp70 acetylation balances stress-induced protein refolding
    and degradation.
  findings: []
- id: PMID:28298427
  title: Systematic protein-protein interaction mapping for clinically relevant human
    GPCRs.
  findings: []
- id: PMID:33857403
  title: DNAJC9 integrates heat shock molecular chaperones into the histone chaperone
    network.
  findings: []
- id: PMID:9553041
  title: Inhibition of cellular proliferation by the Wilms tumor suppressor WT1 requires
    association with the inducible chaperone Hsp70.
  findings: []
- id: Reactome:R-HSA-3371422
  title: ATP hydrolysis by HSP70
  findings: []
- id: Reactome:R-HSA-3371467
  title: SIRT1 deacetylates HSF1
  findings: []
- id: Reactome:R-HSA-3371497
  title: HSP90 chaperone cycle for steroid hormone receptors (SHR) in the presence
    of ligand
  findings: []
- id: Reactome:R-HSA-3371503
  title: STIP1(HOP) binds HSP90 and HSP70:HSP40:nascent protein
  findings: []
- id: Reactome:R-HSA-3371518
  title: SIRT1 binds to HSF1
  findings: []
- id: Reactome:R-HSA-3371554
  title: HSF1 acetylation at Lys80
  findings: []
- id: Reactome:R-HSA-3371590
  title: HSP70 binds to HSP40:nascent protein
  findings: []
- id: Reactome:R-HSA-5082356
  title: HSF1-mediated gene expression
  findings: []
- id: Reactome:R-HSA-5082369
  title: Acetylated HSF1 dissociates from DNA
  findings: []
- id: Reactome:R-HSA-5082384
  title: HSP70:DNAJB1 binds HSF1
  findings: []
- id: Reactome:R-HSA-5251942
  title: Hikeshi binds HSP70s:ATP
  findings: []
- id: Reactome:R-HSA-5251955
  title: HSP40s activate intrinsic ATPase activity of HSP70s in the nucleoplasm
  findings: []
- id: Reactome:R-HSA-5251959
  title: HSP40s activate intrinsic ATPase activity of HSP70s in the cytosol
  findings: []
- id: Reactome:R-HSA-5252041
  title: NPC transports Hikeshi:HSP70s:ATP from cytosol to nucleoplasm
  findings: []
- id: Reactome:R-HSA-5252079
  title: HSP110s exchange ATP for ADP on HSP70s:ADP
  findings: []
- id: Reactome:R-HSA-5618085
  title: FKBP4 binds HSP90:ATP:STIP1:HSP70:nascent protein
  findings: []
- id: Reactome:R-HSA-5618098
  title: p23 (PTGES3) binds HSP90:ATP:FKBP5:nascent protein
  findings: []
- id: Reactome:R-HSA-5618105
  title: FKBP5 binds HSP90:ATP:STIP1:HSP70:nascent protein
  findings: []
- id: Reactome:R-HSA-5618107
  title: ATP binding to HSP90 triggers conformation change
  findings: []
- id: Reactome:R-HSA-5618110
  title: p23 (PTGES3) binds HSP90:ATP:FKBP4:nascent protein
  findings: []
- id: Reactome:R-HSA-6800434
  title: Exocytosis of ficolin-rich granule lumen proteins
  findings: []
- id: Reactome:R-HSA-9835411
  title: FA core complex:HSP70s binds PKR
  findings: []
- id: Reactome:R-HSA-9857076
  title: Oxidized DNAJA1 binds HSPA1A,B (HSP70) displacing HSF1
  findings: []
- id: DOI:10.3390/biom13020272
  title: HSP70 and Primary Arterial Hypertension
  findings:
  - statement: >-
      Comprehensive review of HSP70 domain architecture (NBD, SBD, C-terminal tail),
      co-chaperone dependence (HSP40/DnaJ, HSP90), and role in proteostasis and stress
      adaptation. Notes stress-induced HSP70 expression can reach up to 15% of cellular
      protein.
- id: DOI:10.3389/fonc.2024.1388999
  title: Diversity of extracellular HSP70 in cancer - advancing from a molecular biomarker
    to a novel therapeutic target
  findings:
  - statement: >-
      HSPA1B is among HSP70 family members reported on the plasma membrane and in
      exosomes. Extracellular HSP70 can be actively trafficked through secretory
      granules, ABC transporter-mediated endolysosomal translocation, and exosome/
      ectosome release. Membrane association involves phosphatidylserine binding,
      oligomerization, and enrichment in lipid rafts.
- id: DOI:10.3390/biom13040604
  title: Is It Still Possible to Think about HSP70 as a Therapeutic Target in Onco-Hematological
    Diseases?
  findings:
  - statement: >-
      Reviews membrane-localized HSP70 exposing the TKD epitope (aa450-461) detectable
      by cmHSP70.1 antibody. Notes that HSP70 inhibitors have not reached the clinic
      despite extensive preclinical work. HSP110-family proteins cooperate with HSP70
      and HSP40 in disaggregation.

HSPA1B

Gene Description

Existing Annotations Review

Core Functions

References

📚 Additional Documentation

Deep Research Falcon

Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

Target Gene/Protein Identity (from UniProt):

MANDATORY VERIFICATION STEPS:

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

Research Target:

Output

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

Target Gene/Protein Identity (from UniProt):

MANDATORY VERIFICATION STEPS:

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

Research Target:

Citations

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