HSPA9 is annotated to GO:0006457 protein folding and GO:0016887 ATP hydrolysis activity via UniProtKB-KW to GO mapping reflecting HSP70 family membership.

Manual transfer of experimentally-verified annotation by curator judgment of sequence similarity supports HSPA9 calcium import role inferred from yeast Ssc1 orthology.

PANTHER phylogenetic tree-based annotation propagates conserved Hsp70 chaperone functions (ATP hydrolysis, protein folding chaperone, refolding) and mitochondrial localization across HSPA9 orthologs.

UniProtKB keyword 'Nucleotide-binding' is mapped to GO:0000166 nucleotide binding for HSPA9 based on its conserved HSP70 ATPase domain.

HSPA9 UniProt subcellular location annotations (mitochondrion, cytoplasm, nucleolus) are mapped to corresponding cellular component GO terms.

Curated immunofluorescence images localize HSPA9 to the mitochondrion.

Ensembl Compara orthology-based transfer propagates experimentally validated mortalin functions (iron-sulfur cluster assembly, hematopoiesis regulation, enzyme binding) from HSPA9 orthologs.

Combined automated IEA pipelines annotate HSPA9 with ATP binding and mitochondrion localization based on UniProt features.

HSPA9/mtHsp70 is part of the human mitochondrial inner membrane translocase (TIM23/PAM), supporting an inner-membrane-associated import role.

HSPA9 (mtHsp70) interacts with the J-domain co-chaperone TID1 (DNAJA3); TID1 isoforms are mitochondrial modulators of apoptosis with opposing functions.

HSPA9 is reported to interact with TID1 (the human Drosophila tumor suppressor homologue), supporting its role in J-protein co-chaperone-assisted folding.

HSPA9 was identified in EGFR-overexpressing carcinoma cells in a phosphotyrosine signaling network proteomics study, reported as an HSPA9 interactor in this dataset.

HSPA9/mortalin protein levels and localization were profiled in proteomics of HUVECs undergoing etoposide-induced apoptosis; HSPA9 is reported with mitochondrial localization, unfolded protein binding, and association with negative regulation of apoptosis.

HSPA9 was identified as a differentially abundant protein in nasopharyngeal carcinoma cells with p53 silencing, supporting HSPA9 protein interactions involving p53.

HSPA9 was identified within human mitochondrial DNA nucleoid–associated protein complexes, consistent with a mitochondrial nucleoid localization.

Hep (DNLZ) binds the ATPase domain of human mitochondrial Hsp70 (HSPA9) and regulates its ATP hydrolysis, providing direct biochemical evidence of HSPA9 ATPase activity.

HSPA9/mortalin was identified as a Parkin-associated protein in proteomics analysis of Parkin overexpression, suggesting interaction with the ubiquitin ligase parkin.

HSPA9 was identified as part of the EGFR trafficking interactome regulated by HDAC6.

Reconstitution with purified proteins confirms that mitochondrial Hsp70/mortalin (HSPA9) directly interacts with p53 and identifies additional interacting regions, supporting a direct HSPA9-p53 interaction.

HSPA9 appears as a binding partner in a comprehensive resource of interacting protein regions used to refine human transcription factor networks.

HSPA9 was identified in B-cell exosome proteomics among MHC class II-associated proteins, supporting an extracellular exosomal pool of mortalin.

Human HSC20 (HSCB) is characterized as an unusual DnaJ type III co-chaperone that partners with HSPA9 in iron-sulfur cluster biogenesis.

Knockdown of mouse Hspa9 (a del(5q31.2) gene) decreases hematopoietic progenitors and impairs erythrocyte differentiation, supporting an in vivo role for HSPA9 in regulation of hematopoiesis and erythrocyte development.

HSPA9 was identified in the myosin-II-responsive focal adhesion proteome, suggesting a focal adhesion-associated pool.

HSPA9 was reported to interact with Parkin/Ambra1 in a mitophagy-related interactome, consistent with ubiquitin-protein-ligase binding annotations.

HSPA9 was identified as an interaction partner relevant to Aurora kinase-A regulation of p73 functions, in line with broad protein interaction networks of mortalin.

HSPA9 was captured in an mRNA interactome using PAR-CLIP/proteome-scale mRNA-binding protein discovery, supporting mRNA binding activity.

HSPA9 was identified within the global mRNA-bound proteome, consistent with HDA evidence of RNA binding.

HSPA9/mortalin-p53 interaction is implicated in regulation of the mitochondrial permeability transition pore and necrosis induction by p53.

Extracellular HSPA9 was identified as a novel interaction partner of podoplanin in oral squamous cell carcinoma cells, supporting an extracellular pool of mortalin.

Human mtHSP70 (HSPA9) and NFS1 bind preferentially to the disordered conformation of ISCU, while HSC20 binds the structured conformation, mechanistically integrating HSPA9 into iron-sulfur cluster biogenesis.

HSPA9 appears in the mutant EGFR interactome relevant to vulnerabilities and resistance mechanisms in cancer.

HSC20/HSCB binds LYR motifs to confer specificity of iron-sulfur cluster delivery via the HSPA9 chaperone system.

UBXN2A binds HSPA9/mortalin and interferes with the p53-mortalin interaction in colon cancer cells, promoting cell death and supporting HSPA9 protein-binding annotations.

HSPA9 is included as a node in a proteome-scale map of the human binary interactome.

Biochemical characterization of human mortalin (HSPA9) confirms ATPase activity, adenosine nucleotide binding kinetics, solution structure, and the canonical Hsp70 two-domain organization.

HSPA9 is identified as a component of the mitochondrial intermembrane space bridging (MIB)/SAM-MICOS complex assembly involved in inner mitochondrial membrane organization.

Structural studies of UBXN2A-HSPA9 interaction support a direct binding event with implications for chemotherapy response.

Mitochondrial HSPA9/mortalin regulates erythroid differentiation through iron-sulfur cluster assembly; HSPA9 binds FXN, NFU1, NFS1 and ISCU; mutagenesis of Gly489 disrupts ISC assembly function.

HSPA9 is included in an inter-species protein-protein interaction network mapping conserved interactions across evolutionary distances.

HSPA9/mortalin is identified as a novel interactor in the TCTP interactome in human cancer cells.

A single adaptable cochaperone-scaffold complex (HSPA9/HSC20/ISCU) delivers nascent iron-sulfur clusters to mammalian respiratory chain Complexes I-III, mechanistically anchoring HSPA9 in respiratory chain biogenesis.

HSPA9 appears as a hub in a human interactome map defining protein communities and disease networks.

HSPA9 was identified in histone interaction landscapes by crosslinking mass spectrometry of intact nuclei, suggesting a nuclear-associated pool.

TGR5 promotes cholangiocarcinoma by interacting with HSPA9/mortalin, supporting protein-binding annotations of mortalin to disease-relevant partners.

HSPA9 was identified within the rewired EGFR network in colorectal cancer cells expressing transforming KRAS(G13D).

HSPA9 was identified in the OSMR-associated proteome controlling glioma stem cell respiration and ionizing-radiation resistance.

HSPA9 is part of dual proteome-scale networks revealing cell-specific remodeling of the human interactome.

HSPA9 is a high-confidence component of the quantitative human mitochondrial proteome and shows dynamic remodeling under cellular context.

Cloning of HSPA9 (peptide-binding protein 74) identifies it as a new member of the heat shock protein 70 family with reported cytoplasmic localization in early studies.

Cloning of human mitochondrial Hsp70 (HSPA9) and subcellular localization studies establish mitochondrial localization.

PBP74 (HSPA9), originally identified as a 70-kDa heat shock protein, is shown to be a mitochondrial protein.

HSPA9 was identified by IDA as a mitochondrial protein in studies of Mcl-1 expression patterns.

Reactome event 'Expression of Stress-70 protein, mitochondrial' covers HSPA9 transcription/translation in mitochondrial proteostasis.

HSPA9 cooperates with mitochondrial AAA+ protease CLPXP in matrix protein recognition events captured by Reactome.

HSPA9-related events include LONP1 protease-mediated degradation of mitochondrial matrix proteins, with HSPA9 acting upstream in client triage.

HSPA9-related events include LONP1 binding of mitochondrial matrix proteins, complementing HSPA9-mediated folding/refolding.

HSPA9-related events include CLPXP-mediated degradation of mitochondrial matrix proteins.

Reactome event 'ATF5 and HSF1 trimer activate expression of HSPA9 (mtHSP70)' captures stress-responsive transcriptional activation of HSPA9.

HSPA9 (mortalin/GRP75/mtHsp70/PBP74) is the canonical mitochondrial Hsp70 chaperone with N-terminal ATPase and C-terminal substrate-binding domains; it acts as the ATPase motor of the PAM import complex and partners with HSC20 in iron-sulfur cluster delivery.