DBP5

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0003724 RNA helicase activity	IBA GO_REF:0000033	ACCEPT	Summary: DBP5 is a well-characterized DEAD-box RNA helicase with demonstrated ATP-dependent RNA unwinding activity. The IBA annotation is supported by extensive experimental evidence from multiple species, representing a core molecular function conserved across eukaryotes. Reason: This is a core function of DBP5. The DEAD-box helicase family is defined by this activity. The protein contains the diagnostic DEAD box motif and Q motif characteristic of this helicase class. IBA reflects legitimate phylogenetic inference of this conserved catalytic domain function. Supporting Evidence: PMID:9564047 It is shown here that Dbp5p is an ATP-dependent RNA helicase required for polyadenylated [poly(A)+] RNA export. PMID:9564048 Dbp5p/Rat8p, a previously uncharacterized member of the DEAD-box family of proteins, is closely related to eukaryotic initiation factor 4A(eIF4A) an RNA helicase essential for protein synthesis initiation. file:yeast/DBP5/DBP5-deep-research-falcon.md Dbp5 is a DEAD-box RNA helicase-family protein whose core activity is RNA-dependent ATP hydrolysis coupled to nucleotide-state–dependent conformational cycling, enabling binding and remodeling of RNA–protein complexes (RNPs) rather than long-range processive duplex unwinding. In the export context, this remodeling function is often described as an RNPase activity acting on messenger RNPs at the NPC
GO:0003729 mRNA binding	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: DBP5 binds mRNA as part of its catalytic mechanism for helicase activity. However, this annotation is overly generic for a protein whose function is specifically remodeling mRNP complexes. The binding represents a means to the mechanistic end of mRNA remodeling and export, not a separate function. Reason: While DBP5 does bind mRNA, describing this as a separate function obscures the more informative molecular mechanism. DBP5 binds mRNA transiently as substrate for ATP-dependent unwinding during the mRNA export process. The IBA annotation is technically correct but less informative than the actual catalytic function (RNA helicase activity). This should not be listed as a core function alongside the helicase activity, as it is subsidiary to that activity. Supporting Evidence: PMID:9564047 It is shown here that Dbp5p is an ATP-dependent RNA helicase required for polyadenylated [poly(A)+] RNA export. PMID:9564047 Dbp5p may play a role in unloading or remodeling messenger RNA particles (mRNPs) upon arrival in the cytoplasm
GO:0005634 nucleus	IBA GO_REF:0000033	ACCEPT	Summary: DBP5 localizes to the nucleus and specifically to the nuclear pore complex region. The IBA annotation reflects this well-documented subcellular localization pattern. Reason: While DBP5 is primarily cytoplasmic, it does accumulate at the nuclear pore complex on the cytoplasmic side and transiently associates with nuclear structures. The IBA annotation is appropriate for phylogenetic inference of documented subcellular localization. Supporting Evidence: PMID:9564048 Dbp5p/Rat8p is located within the cytoplasm and concentrated in the perinuclear region. Analysis of the distribution of Dbp5p/Rat8p in yeast strains where nuclear pore complexes are tightly clustered indicated that a fraction of this protein associates with nuclear pore complexes (NPCs).
GO:0010494 cytoplasmic stress granule	IBA GO_REF:0000033	KEEP AS NON CORE	Summary: DBP5 has been observed in cytoplasmic stress granules, which is consistent with the protein's broader role in mRNA remodeling and processing. This represents a secondary cellular role. Reason: DBP5's presence in stress granules represents a stress-response localization of the protein rather than a core catalytic function. This is a conditional, non-essential aspect of DBP5 biology. The protein's primary function is mRNA export, with stress granule association being a secondary phenomenon. Supporting Evidence: PMID:27251550 Defects in THO/TREX-2 function cause accumulation of novel cytoplasmic mRNP granules
GO:0016973 poly(A)+ mRNA export from nucleus	IBA GO_REF:0000033	ACCEPT	Summary: DBP5 is a key factor in mRNA export from the nucleus. The poly(A)+ specificity reflects the well-characterized role of DBP5 in the export of mature, polyadenylated mRNAs. The IBA annotation appropriately represents this core function. Reason: This is a primary core function of DBP5. Extensive experimental evidence demonstrates that DBP5 is essential for mRNA export, specifically acting on poly(A)+ mRNAs at the cytoplasmic face of the nuclear pore complex. The phylogenetic inference is appropriate for this conserved and well-documented function. Supporting Evidence: PMID:9564047 Dbp5p is an ATP-dependent RNA helicase required for polyadenylated [poly(A)+] RNA export. PMID:9564048 In rat8 mutant strains, cells displayed rapid, synchronous accumulation of poly(A)+ RNA in nuclei when shifted to the non-permissive temperature. file:yeast/DBP5/DBP5-deep-research-falcon.md The mechanistic focus is on Dbp5-driven removal of export-associated factors such as Mex67–Mtr2 (major mRNA export receptor) and Nab2 (poly(A) RNA-binding/export factor), thereby enforcing directionality and enabling cytoplasmic fate decisions file:yeast/DBP5/DBP5-deep-research-falcon.md Directionality is established at the cytoplasmic NPC face, where Dbp5 activity promotes dissociation of export factors from the mRNP so that the particle cannot re-enter the nucleus using the same export-binding interactions
GO:0000166 nucleotide binding	IEA GO_REF:0000043	KEEP AS NON CORE	Summary: DBP5 is an ATP-dependent enzyme that requires nucleotide binding for catalytic activity. This is a predictable annotation based on the helicase domain and ATP-binding motifs. Reason: While technically correct, nucleotide binding is a subsidiary property of ATP-dependent enzymes. This is less informative than the actual ATP binding term and should not be emphasized as a core function.
GO:0003676 nucleic acid binding	IEA GO_REF:0000002	KEEP AS NON CORE	Summary: DBP5 binds nucleic acid (RNA) as part of its helicase mechanism. The InterPro mapping is appropriate for this conserved domain property. Reason: This is a parent term of RNA binding and is appropriate but redundant with more specific annotations. RNA binding subsumes this annotation.
GO:0003723 RNA binding	IEA GO_REF:0000043	KEEP AS NON CORE	Summary: DBP5 binds RNA as substrate for helicase activity. This is documented from domain analysis and experimental evidence. Reason: RNA binding is a mechanistic property subsidiary to the primary helicase activity. Should not be listed as a core function separately from the catalytic activity.
GO:0003724 RNA helicase activity	IEA GO_REF:0000120	ACCEPT	Summary: DBP5 helicase activity is correctly inferred from domain annotation and sequence homology. This IEA annotation duplicates the IBA and IDA annotations already present. Reason: While redundant with IBA and IDA annotations for the same term, this IEA annotation is correct and appropriately supported by InterPro mapping. Multiple evidence codes for the same well-established function is acceptable in GO.
GO:0004386 helicase activity	IEA GO_REF:0000043	ACCEPT	Summary: DBP5 is a helicase with nucleic acid unwinding activity. This is a parent term to RNA helicase activity. Reason: This is a correct characterization of DBP5 as a helicase. While more general than RNA helicase activity, it appropriately represents the broader catalytic class.
GO:0005524 ATP binding	IEA GO_REF:0000120	ACCEPT	Summary: DBP5 contains a DEAD box domain with ATP binding site. This binding is essential for the helicase mechanism. Reason: ATP binding is a core mechanistic feature of DEAD-box helicases and is well-documented in the protein structure and function. This is appropriate to retain.
GO:0005643 nuclear pore	IEA GO_REF:0000044	ACCEPT	Summary: DBP5 is associated with the nuclear pore complex, specifically on the cytoplasmic face. The subcellular location annotation is appropriate. Reason: DBP5 is indeed a component of the nuclear pore export machinery. The annotation correctly represents the structural context where the protein operates.
GO:0005737 cytoplasm	IEA GO_REF:0000120	ACCEPT	Summary: DBP5 localizes primarily to the cytoplasm, where it resides both diffusely and at the nuclear pore complex. Reason: Appropriate subcellular localization annotation confirmed by experimental data. The cytoplasmic localization is essential for its mRNA export function.
GO:0010467 gene expression	IEA GO_REF:0000117	MARK AS OVER ANNOTATED	Summary: DBP5 contributes to gene expression by facilitating mRNA export, which is downstream of transcription and essential for protein synthesis. Reason: While DBP5 is involved in the post-transcriptional steps of gene expression, this annotation is overly broad and generic. DBP5 is not directly involved in transcription, translation initiation, or other early gene expression steps. The term obscures the specific mRNA export function.
GO:0015031 protein transport	IEA GO_REF:0000043	REMOVE	Summary: DBP5 is annotated as protein transport based on general transport keywords. However, DBP5 specifically transports RNA, not proteins. Reason: This annotation is mechanistically incorrect. DBP5 facilitates mRNA transport, not protein transport. The mRNA is transported as an mRNP complex, but the cargo is RNA, not protein. This should be removed in favor of more accurate mRNA transport annotations.
GO:0016787 hydrolase activity	IEA GO_REF:0000043	ACCEPT	Summary: DBP5 is an ATP-dependent enzyme with ATP hydrolysis activity as part of its catalytic mechanism. This parent term is appropriate. Reason: Hydrolase activity is the correct parent classification for ATP-dependent enzymes including helicases. This annotation accurately represents the enzymatic class.
GO:0016887 ATP hydrolysis activity	IEA GO_REF:0000116	ACCEPT	Summary: DBP5 catalyzes ATP hydrolysis coupled to RNA unwinding. The Rhea mapping appropriately captures this catalytic activity. Reason: This accurately represents the ATP hydrolysis catalytic activity. DEAD-box helicases use ATP hydrolysis to power RNA unwinding, making this annotation both appropriate and informative.
GO:0031965 nuclear membrane	IEA GO_REF:0000044	ACCEPT	Summary: DBP5 associates with the nuclear pore complex, which is embedded in the nuclear membrane. The localization annotation is appropriate. Reason: The nuclear membrane is the structural context where the nuclear pore complex resides. DBP5 peripheral association with the nuclear pore complex on the cytoplasmic face makes this annotation appropriate.
GO:0051028 mRNA transport	IEA GO_REF:0000043	ACCEPT	Summary: DBP5 functions in mRNA transport from nucleus to cytoplasm. This process term appropriately captures DBP5's role in mRNA export. Reason: mRNA transport is an appropriate process annotation for DBP5. While more general than the specific poly(A)+ mRNA export annotation, it correctly characterizes the biological process.
GO:0005515 protein binding	IPI PMID:15619606 Physical and genetic interactions link the yeast protein Zds...	REMOVE	Summary: DBP5 physically interacts with multiple protein partners including Zds1p and Gfd1p (Ymr255p). These protein-protein interactions are documented by experimental methods. However, generic protein binding term is uninformative. Reason: While the protein binding is documented, this annotation is overly generic and uninformative. The specific binding partners (Zds1p, Gfd1p) are known and documented in UniProt. Rather than generic protein binding, the annotations should focus on the functional roles of these interactions in mRNA export and complex assembly. Generic protein binding terms should be avoided per GO best practices. Supporting Evidence: PMID:15619606 2004 Dec 24. Physical and genetic interactions link the yeast protein Zds1p with mRNA nuclear export.
GO:0005515 protein binding	IPI PMID:16554755 Global landscape of protein complexes in the yeast Saccharom...	REMOVE	Summary: Protein binding annotation from large-scale yeast protein interaction study. While interactions are documented, the generic nature of the annotation is not informative. Reason: Generic protein binding annotations are not recommended per GO guidelines. Large-scale interaction studies should be represented at the level of specific, named binding partners and their functional roles. Supporting Evidence: PMID:16554755 Global landscape of protein complexes in the yeast Saccharomyces cerevisiae.
GO:0005515 protein binding	IPI PMID:19805289 Structure of the C-terminus of the mRNA export factor Dbp5 r...	REMOVE	Summary: DBP5 interacts with Gle1p, its primary regulatory partner. This interaction is essential for DBP5 activation and mRNA export function. Reason: While the Gle1p interaction is critical, generic protein binding obscures this specific and important interaction. This would be better represented as a specific protein binding annotation for Gle1p, or better yet, as the functional consequence (activation by Gle1p and InsP6). Supporting Evidence: PMID:19805289 Structure of the C-terminus of the mRNA export factor Dbp5 reveals the interaction surface for the ATPase activator Gle1.
GO:0005515 protein binding	IPI PMID:21441902 A conserved mechanism of DEAD-box ATPase activation by nucle...	REMOVE	Summary: Protein binding annotation from study of DEAD-box ATPase activation mechanism. The specific partners are nucleoporins and Gle1p involved in mRNA export. Reason: The generic protein binding term obscures the mechanistic importance of these interactions. While interactions are documented, they should be represented through their functional roles in mRNA export rather than as generic protein binding. Supporting Evidence: PMID:21441902 A conserved mechanism of DEAD-box ATPase activation by nucleoporins and InsP6 in mRNA export.
GO:0006409 tRNA export from nucleus	IDA PMID:31453808 A nuclear role for the DEAD-box protein Dbp5 in tRNA export.	KEEP AS NON CORE	Summary: Evidence demonstrates that DBP5 has a function in tRNA export from the nucleus, in addition to its well-characterized mRNA export role. Falcon deep research (Rajan et al. 2024, eLife) adds biochemical and genetic detail: Dbp5 directly binds tRNA (Kd ~130-150 nM), but tRNA/dsRNA alone does not stimulate its ATPase; instead tRNA synergizes with Gle1/InsP6 to fully activate Dbp5, and Dbp5 acts in a Los1-independent pathway. This is a well-supported additional RNA export function rather than mere substrate promiscuity. Reason: The evidence for tRNA export is solid and now mechanistically defined, but it represents a secondary function relative to the protein's primary and essential role in bulk poly(A)+ mRNA export. Dbp5 binds structured tRNA directly and is activated via the same Gle1/InsP6 module used for mRNA export, operating in a pathway parallel to and independent of the canonical exporter Los1. Retained as non-core because mRNA export, not tRNA export, defines the essential function. Supporting Evidence: PMID:31453808 A nuclear role for the DEAD-box protein Dbp5 in tRNA export. file:yeast/DBP5/DBP5-deep-research-falcon.md Dbp5 binds tRNA in vitro with Kd ~150 nM (Phe tRNA) and ~130 nM (mixed tRNA) (Rajan et al., eLife 2024-01, https://doi.org/10.7554/elife.89835). file:yeast/DBP5/DBP5-deep-research-falcon.md tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity, unlike a typical ssRNA activator (poly(A)). However, tRNA/dsRNA synergizes with Gle1/InsP6 to fully activate Dbp5, reaching ~1.03 ± 0.04 ATP/s (mixed tRNA with Gle1/InsP6) comparable to ssRNA activation (~1.11 ± 0.07 ATP/s) file:yeast/DBP5/DBP5-deep-research-falcon.md Rajan et al. (eLife 2024-01) provide genetic and biochemical evidence that Dbp5 functions in tRNA export in a pathway parallel to canonical exporters:
GO:0003724 RNA helicase activity	IDA PMID:9564047 Dbp5p, a cytosolic RNA helicase, is required for poly(A)+ RN...	ACCEPT	Summary: Experimental evidence directly demonstrates DBP5 RNA helicase activity. The IDA annotation with PMID:9564047 is redundant with the IBA and IEA annotations for the same term, but provides direct experimental confirmation. Reason: Multiple evidence codes for the same well-established function are appropriate. This IDA annotation provides direct experimental confirmation of the helicase activity. Supporting Evidence: PMID:9564047 Dbp5p is an ATP-dependent RNA helicase required for polyadenylated [poly(A)+] RNA export.
GO:0010494 cytoplasmic stress granule	IDA PMID:27251550 Defects in THO/TREX-2 function cause accumulation of novel c...	KEEP AS NON CORE	Summary: Experimental data shows DBP5 localizes to cytoplasmic stress granule-like structures under conditions of defective mRNA export. Reason: This annotation represents a secondary, conditional localization. DBP5 stress granule accumulation occurs in response to mRNA export defects, not as a primary cellular function. Should be marked as non-core. Supporting Evidence: PMID:27251550 Defects in THO/TREX-2 function cause accumulation of novel cytoplasmic mRNP granules that can be cleared by autophagy.
GO:0016973 poly(A)+ mRNA export from nucleus	IMP PMID:27385342 Altered RNA processing and export lead to retention of mRNAs...	ACCEPT	Summary: Experimental mutation and phenotypic analysis shows DBP5 is directly involved in mRNA export. Multiple IMP and IDA annotations confirm this core function. Reason: This is a primary core function confirmed by multiple experimental methods. IMP annotations appropriately reflect the loss-of-function phenotype of DBP5 mutations. Supporting Evidence: PMID:27385342 Altered RNA processing and export lead to retention of mRNAs near transcription sites and nuclear pore complexes or within the nucleolus.
GO:0000822 inositol hexakisphosphate binding	IDA PMID:16783363 Inositol hexakisphosphate and Gle1 activate the DEAD-box pro...	ACCEPT	Summary: DBP5 directly binds inositol hexakisphosphate (InsP6), an essential cofactor that activates its ATPase activity at the nuclear pore complex. Reason: This represents a specific, mechanistically important ligand binding interaction. InsP6 is a cofactor required for DBP5 activation in mRNA export. The annotation appropriately represents this catalytic requirement. Supporting Evidence: PMID:16783363 We now propose that Dbp5 activation at NPCs requires Gle1 and InsP6. file:yeast/DBP5/DBP5-deep-research-falcon.md Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by activating Dbp5 ATPase and promoting localized mRNP remodeling and directionality; they also report that the same module is required for proper translation termination
GO:0005634 nucleus	IDA PMID:15280434 Stress response in yeast mRNA export factor: reversible chan...	ACCEPT	Summary: DBP5 localizes to the nucleus and undergoes stress-dependent relocalization to nuclear regions under ethanol stress. Reason: Appropriate experimental confirmation of nuclear localization. While DBP5 is primarily cytoplasmic, it does associate with nuclear structures, particularly under stress conditions. Supporting Evidence: PMID:15280434 Jul 27. Stress response in yeast mRNA export factor: reversible changes in Rat8p localization are caused by ethanol stress but not heat shock.
GO:0005737 cytoplasm	IDA PMID:10610322 The RNA export factor Gle1p is located on the cytoplasmic fi...	ACCEPT	Summary: DBP5 is predominantly localized to the cytoplasm and is concentrated around the nuclear envelope at the cytoplasmic face of the nuclear pore complex. Reason: The primary subcellular localization of DBP5 is cytoplasmic. This annotation appropriately reflects the experimental localization data. Supporting Evidence: PMID:10610322 immunoelectron microscopy localizations indicate that Gle1p, Rip1p and Rat8p/Dbp5p are present on the NPC cytoplasmic fibrils
GO:0005737 cytoplasm	IDA PMID:15280434 Stress response in yeast mRNA export factor: reversible chan...	ACCEPT	Summary: DBP5 cytoplasmic localization confirmed under stress conditions. Redundant with other cytoplasm annotations but provides condition-specific evidence. Reason: Multiple lines of evidence confirm cytoplasmic localization under different conditions. Retention of redundant annotations is acceptable. Supporting Evidence: PMID:15280434 Jul 27. Stress response in yeast mRNA export factor: reversible changes in Rat8p localization are caused by ethanol stress but not heat shock.
GO:0005737 cytoplasm	IDA PMID:9564048 Dbp5p/Rat8p is a yeast nuclear pore-associated DEAD-box prot...	ACCEPT	Summary: DBP5 is located in the cytoplasm, concentrated in the perinuclear region. Reason: Multiple evidence codes for the same subcellular localization reflect convergent experimental evidence from independent studies. Supporting Evidence: PMID:9564048 Dbp5p/Rat8p is located within the cytoplasm and concentrated in the perinuclear region.
GO:0005934 cellular bud tip	IDA PMID:19198597 Nuclear transport factor directs localization of protein syn...	KEEP AS NON CORE	Summary: DBP5 localizes to the cellular bud tip, possibly involved in directing mRNA and/or translation during mitosis. Reason: While localization to bud tip is documented, this represents a specialized, conditional cellular location related to cell division. This is a secondary, non-essential aspect of DBP5 cellular distribution. Supporting Evidence: PMID:19198597 Nuclear transport factor directs localization of protein synthesis during mitosis.
GO:0006406 mRNA export from nucleus	IMP PMID:9564048 Dbp5p/Rat8p is a yeast nuclear pore-associated DEAD-box prot...	ACCEPT	Summary: Experimental mutation phenotype shows DBP5 is essential for mRNA export from the nucleus. IMP annotation reflects the loss-of-function phenotype. Reason: This is a primary core function confirmed by classical loss-of-function experiments. The IMP annotation appropriately represents the mutant phenotype. Supporting Evidence: PMID:9564048 In rat8 mutant strains, cells displayed rapid, synchronous accumulation of poly(A)+ RNA in nuclei when shifted to the non-permissive temperature.
GO:0006415 translational termination	IGI PMID:17272721 The DEAD-box RNA helicase Dbp5 functions in translation term...	KEEP AS NON CORE	Summary: DBP5 shows genetic interaction with translation termination factors eRF1 and eRF3, indicating a role in translation termination beyond mRNA export. Falcon deep research (Querl & Krebber 2023 review) supports a defined mechanism in which Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1-eRF3 interactions, thereby reducing readthrough. The same Gle1/InsP6 activation module that supports mRNA export is also required for proper translation termination. Reason: The genetic interactions are documented, and falcon deep research indicates this is a direct, mechanistically defined coupled function rather than mere pleiotropy or an indirect consequence of mRNA export defects: Dbp5 is proposed to deliver eRF1 to terminating ribosomes and prevent premature eRF1-eRF3 association. It is retained as non-core because the essential, defining function of Dbp5 is bulk mRNA export at the NPC, with translation termination being one of several downstream gene-expression steps that Dbp5 couples. Supporting Evidence: PMID:17272721 Dbp5 interacts genetically with both release factors and the polyadenlyate-binding protein Pab1. file:yeast/DBP5/DBP5-deep-research-falcon.md Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in translation termination, including a mechanistic model where Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough file:yeast/DBP5/DBP5-deep-research-falcon.md Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by activating Dbp5 ATPase and promoting localized mRNP remodeling and directionality; they also report that the same module is required for proper translation termination
GO:0006415 translational termination	IPI PMID:17272721 The DEAD-box RNA helicase Dbp5 functions in translation term...	KEEP AS NON CORE	Summary: DBP5 shows direct physical interaction with eRF1, a translation termination factor. The interaction is specifically detected and characterized. Falcon deep research supports a model in which Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1-eRF3 interactions, reducing stop-codon readthrough. Reason: The physical interaction with eRF1 is documented and falcon deep research places it in a defined mechanistic model (Dbp5 delivers eRF1 and prevents premature eRF1-eRF3 association). Translation termination is retained as non-core because the protein's essential, defining function is bulk mRNA export at the nuclear pore complex; translation termination is one of the coupled downstream gene-expression steps. Supporting Evidence: PMID:17272721 The DEAD-box RNA helicase Dbp5 functions in translation termination. file:yeast/DBP5/DBP5-deep-research-falcon.md Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in translation termination, including a mechanistic model where Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough
GO:0008186 ATP-dependent activity, acting on RNA	IDA PMID:19805289 Structure of the C-terminus of the mRNA export factor Dbp5 r...	ACCEPT	Summary: DBP5 is directly shown to have ATP-dependent RNA-modifying activity. This reflects the core catalytic function of the helicase. Reason: This annotation appropriately characterizes the ATP-dependent catalytic activity of DBP5 acting on RNA. It is both informative and accurate. Supporting Evidence: PMID:19805289 Structure of the C-terminus of the mRNA export factor Dbp5 reveals the interaction surface for the ATPase activator Gle1.
GO:0044614 nuclear pore cytoplasmic filaments	IDA PMID:10610322 The RNA export factor Gle1p is located on the cytoplasmic fi...	ACCEPT	Summary: DBP5 is experimentally localized to the cytoplasmic filaments of the nuclear pore complex, where it functions in mRNA remodeling. Reason: This annotation accurately represents the specific subcellular microlocalization of DBP5 within the NPC structure. It provides important detail about where the mRNA export activity occurs. Supporting Evidence: PMID:10610322 immunoelectron microscopy localizations indicate that Gle1p, Rip1p and Rat8p/Dbp5p are present on the NPC cytoplasmic fibrils file:yeast/DBP5/DBP5-deep-research-falcon.md Dbp5 is enriched at the nuclear rim and is a key factor on the cytoplasmic face/cytoplasmic fibrils of the NPC, where terminal export remodeling is executed file:yeast/DBP5/DBP5-deep-research-falcon.md Dbp5 association with NPCs is highly dynamic, with ~0.8 s average residence time reported by FRAP in yeast

Core Functions

DBP5 catalyzes ATP-dependent RNA unwinding (helicase activity) as a core function, operating at the cytoplasmic filaments of the nuclear pore complex where it remodels mRNP complexes to facilitate mRNA export. The protein is a key component of the terminal step of mRNA export, where it removes mRNA-binding proteins and remodels the mRNP to allow passage through the NPC.

Molecular Function:

RNA helicase activity

Directly Involved In:

mRNA export from nucleus poly(A)+ mRNA export from nucleus

In Complex:

nuclear pore cytoplasmic filaments

Supporting Evidence:

PMID:9564047
Dbp5p is an ATP-dependent RNA helicase required for polyadenylated [poly(A)+] RNA export.
PMID:9564048
In rat8 mutant strains, cells displayed rapid, synchronous accumulation of poly(A)+ RNA in nuclei when shifted to the non-permissive temperature.
PMID:10610322
immunoelectron microscopy localizations indicate that Gle1p, Rip1p and Rat8p/Dbp5p are present on the NPC cytoplasmic fibrils

DBP5 binds inositol hexakisphosphate (InsP6) as a critical cofactor for activation at the nuclear pore complex. InsP6 binding is mediated by the nucleoporin Gle1 and is essential for efficient mRNA export. This interaction provides spatial and mechanistic control of DBP5 ATPase activity.

Molecular Function:

inositol hexakisphosphate binding

Directly Involved In:

poly(A)+ mRNA export from nucleus

In Complex:

nuclear pore

Supporting Evidence:

PMID:16783363
We now propose that Dbp5 activation at NPCs requires Gle1 and InsP6.
PMID:21441902
A conserved mechanism of DEAD-box ATPase activation by nucleoporins and InsP6 in mRNA export.

References

GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

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:0000116

Automatic Gene Ontology annotation based on Rhea mapping

GO_REF:0000117

Electronic Gene Ontology annotations created by ARBA machine learning models

GO_REF:0000120

Combined Automated Annotation using Multiple IEA Methods

PMID:10610322

The RNA export factor Gle1p is located on the cytoplasmic fibrils of the NPC and physically interacts with the FG-nucleoporin Rip1p, the DEAD-box protein Rat8p/Dbp5p and a new protein Ymr 255p.

PMID:15280434

Stress response in yeast mRNA export factor: reversible changes in Rat8p localization are caused by ethanol stress but not heat shock.

PMID:15619606

Physical and genetic interactions link the yeast protein Zds1p with mRNA nuclear export.

PMID:16554755

Global landscape of protein complexes in the yeast Saccharomyces cerevisiae.

PMID:16783363

Inositol hexakisphosphate and Gle1 activate the DEAD-box protein Dbp5 for nuclear mRNA export.

PMID:17272721

The DEAD-box RNA helicase Dbp5 functions in translation termination.

PMID:19198597

Nuclear transport factor directs localization of protein synthesis during mitosis.

PMID:19805289

Structure of the C-terminus of the mRNA export factor Dbp5 reveals the interaction surface for the ATPase activator Gle1.

PMID:21441902

A conserved mechanism of DEAD-box ATPase activation by nucleoporins and InsP6 in mRNA export.

PMID:27251550

Defects in THO/TREX-2 function cause accumulation of novel cytoplasmic mRNP granules that can be cleared by autophagy.

PMID:27385342

Altered RNA processing and export lead to retention of mRNAs near transcription sites and nuclear pore complexes or within the nucleolus.

PMID:31453808

A nuclear role for the DEAD-box protein Dbp5 in tRNA export.

PMID:9564047

Dbp5p, a cytosolic RNA helicase, is required for poly(A)+ RNA export.

PMID:9564048

Dbp5p/Rat8p is a yeast nuclear pore-associated DEAD-box protein essential for RNA export.

file:yeast/DBP5/DBP5-deep-research-falcon.md

Falcon deep research report on DBP5 (Saccharomyces cerevisiae Dbp5/Rat8, UniProt P20449)

Dbp5/Rat8 is an essential DEAD-box ATP-dependent RNA helicase / RNA-dependent ATPase that acts at the cytoplasmic face of the nuclear pore complex (NPC) and is orthologous to metazoan DDX19.

"The literature summarized here is specifically for **Dbp5** (alias **Rat8**) from *Saccharomyces cerevisiae* (S288c), an essential **DEAD-box ATP-dependent RNA helicase/RNA-dependent ATPase** at the nuclear pore complex (NPC), orthologous to metazoan **DDX19**."
The core activity of Dbp5 is RNA-dependent ATP hydrolysis coupled to nucleotide-state-dependent conformational cycling, enabling binding and remodeling of RNA-protein complexes (RNPs) rather than long-range processive duplex unwinding; this remodeling is often described as an RNPase activity.

"Dbp5 is a DEAD-box RNA helicase-family protein whose core activity is **RNA-dependent ATP hydrolysis** coupled to **nucleotide-state–dependent conformational cycling**, enabling binding and remodeling of RNA–protein complexes (RNPs) rather than long-range processive duplex unwinding. In the export context, this remodeling function is often described as an **RNPase** activity acting on messenger RNPs at the NPC"
mRNP remodeling by Dbp5 at the cytoplasmic NPC face removes export-associated factors such as Mex67-Mtr2 and Nab2 from exported mRNA, enforcing directionality.

"The mechanistic focus is on Dbp5-driven removal of export-associated factors such as **Mex67–Mtr2** (major mRNA export receptor) and **Nab2** (poly(A) RNA-binding/export factor), thereby enforcing directionality and enabling cytoplasmic fate decisions"
Directionality of export is established at the cytoplasmic NPC face, where Dbp5 activity promotes dissociation of export factors so the mRNP cannot re-enter the nucleus using the same export-binding interactions.

"Directionality is established at the **cytoplasmic NPC face**, where Dbp5 activity promotes dissociation of export factors from the mRNP so that the particle **cannot re-enter the nucleus using the same export-binding interactions**"
Dbp5 catalyzes RNA-dependent ATP hydrolysis (ATP to ADP + Pi), with the remodeling function associated with conformational changes across its nucleotide cycle.

"Dbp5 catalyzes **ATP hydrolysis (ATP → ADP + Pi)** in an RNA-dependent manner, with its remodeling function associated with conformational changes across its nucleotide cycle"
Gle1 bound to inositol hexakisphosphate (IP6) activates the Dbp5 ATPase and promotes localized mRNP remodeling and directionality; the same module is required for proper translation termination.

"Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by **activating Dbp5 ATPase** and promoting localized mRNP remodeling and directionality; they also report that the same module is required for **proper translation termination**"
Nup159 tethers Dbp5 to NPC cytoplasmic filaments and primarily facilitates ADP release / recycling, enabling additional rounds of remodeling; ADP binding alone is sufficient to drive in vitro Nab2-RNP remodeling.

"Noble et al. (Genes & Dev. 2011-05, https://doi.org/10.1101/gad.2040611) conclude that “a primary role for Nup159 in the Dbp5 cycle is to facilitate ADP release,” and show that ADP binding alone is sufficient to drive in vitro remodeling of Nab2-RNPs under their assay conditions"
Nup42 enhances Gle1-dependent stimulation of the RNA-dependent Dbp5 ATPase and supports formation of a Nup42-CTD/Gle1-CTD/Dbp5 trimeric complex in the presence of IP6.

"Adams et al. (Traffic 2017-10, https://doi.org/10.1111/tra.12526) report that Nup42/hNup42 enhances Gle1 stimulation of the RNA-dependent Dbp5/DDX19B ATPase, and that a **nup42-CTD/gle1-CTD/Dbp5 trimeric complex forms in the presence of IP6**"
Dbp5 association with NPCs is highly dynamic, with an average residence time of approximately 0.8 s reported by FRAP in yeast.

"Dbp5 association with NPCs is highly dynamic, with **~0.8 s** average residence time reported by FRAP in yeast"
Dbp5 directly binds tRNA in vitro (Kd ~150 nM Phe tRNA, ~130 nM mixed tRNA), but tRNA/dsRNA alone does not stimulate its ATPase; instead it synergizes with Gle1/InsP6 to fully activate Dbp5.

"Dbp5 binds tRNA in vitro with **Kd ~150 nM** (Phe tRNA) and **~130 nM** (mixed tRNA) (Rajan et al., eLife 2024-01, https://doi.org/10.7554/elife.89835)."
tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity, unlike a typical ssRNA activator (poly(A)); tRNA/dsRNA synergizes with Gle1/InsP6 to fully activate Dbp5 to a level comparable with ssRNA activation.

"**tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity**, unlike a typical ssRNA activator (poly(A)). However, **tRNA/dsRNA synergizes with Gle1/InsP6 to fully activate Dbp5**, reaching ~**1.03 ± 0.04 ATP/s** (mixed tRNA with Gle1/InsP6) comparable to ssRNA activation (~**1.11 ± 0.07 ATP/s**)"
Rajan et al. provide genetic and biochemical evidence that Dbp5 functions in tRNA export in a pathway parallel to canonical exporters (Los1-independent), with Gle1 supporting pre-tRNA export.

"Rajan et al. (eLife 2024-01) provide genetic and biochemical evidence that Dbp5 functions in tRNA export in a pathway parallel to canonical exporters:"
Querl & Krebber (2023) review evidence that Dbp5 functions in translation termination via a model in which Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1-eRF3 interactions, thereby reducing readthrough.

"Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in **translation termination**, including a mechanistic model where Dbp5 delivers **eRF1** to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough"
Querl & Krebber (2023) summarize a model in which Dbp5 contributes to no-go decay (NGD) and non-stop decay (NSD) by delivering rescue factors Dom34/Hbs1 to stalled ribosomes.

"Querl & Krebber (2023) summarize a model in which Dbp5 contributes to no-go decay (NGD) and non-stop decay (NSD) by delivering rescue factors **Dom34/Hbs1** to stalled ribosomes; subsequent hydrolysis steps coordinate rescue and transcript clearance"
Recent synthesis places Dbp5 in pre-ribosomal subunit export, with a model where Dbp5 binds Mex67 on pre-ribosomal particles in the cytoplasm to capture translocating subunits; this role may be less dependent on canonical helicase remodeling than mRNA export.

"Recent synthesis also places Dbp5 in pre-ribosomal export, with a model distinct from canonical mRNA remodeling:"

Deep Research

Falcon

(DBP5-deep-research-falcon.md)

this with annotations you find in gene/protein databases, but these can be outdated or inaccurate. Falcon Edison Scientific Literature 27 citations 2 artifacts 2026-05-30T09:56:48.159439

Edison artifact artifact-00 (text/markdown)

## Context ID: pqac-00000016 The schematic of Dbp5 functions and its various partners is presented in Figure 1. This figure illustrates Dbp5's roles in several (image/png)

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.

Research Report: Functional Annotation of Saccharomyces cerevisiae DBP5/RAT8 (UniProt P20449)

1) Target verification (critical disambiguation)

The literature summarized here is specifically for Dbp5 (alias Rat8) from Saccharomyces cerevisiae (S288c), an essential DEAD-box ATP-dependent RNA helicase/RNA-dependent ATPase at the nuclear pore complex (NPC), orthologous to metazoan DDX19. Multiple sources explicitly describe Dbp5/Rat8 as a conserved DEAD-box factor concentrated at the nuclear rim/NPC cytoplasmic face and required for RNA export and downstream gene-expression steps, consistent with UniProt P20449 and the DDX19/Dbp5 family assignment (https://doi.org/10.1515/hsz-2023-0130; https://doi.org/10.1074/jbc.M109.082370; https://doi.org/10.1101/gad.2041611; https://doi.org/10.1101/gad.2040611; https://doi.org/10.7554/elife.89835). (querl2023thedeadboxrna pages 1-3, alcazarroman2010controlofmrna pages 1-2, hodge2011thedbp5cycle pages 9-10, noble2011thedbp5cycle pages 7-8, rajan2024gle1isrequired pages 10-12)

2) Key concepts and definitions (current understanding)

2.1 DEAD-box ATPase / RNA helicase (what Dbp5 “does”)

Dbp5 is a DEAD-box RNA helicase-family protein whose core activity is RNA-dependent ATP hydrolysis coupled to nucleotide-state–dependent conformational cycling, enabling binding and remodeling of RNA–protein complexes (RNPs) rather than long-range processive duplex unwinding. In the export context, this remodeling function is often described as an RNPase activity acting on messenger RNPs at the NPC (querl2023thedeadboxrna pages 1-3, rajan2023investigatingarole pages 21-25).

2.2 “mRNP remodeling” in the Dbp5 pathway

In the mRNA export field, “mRNP remodeling” refers to localized restructuring/displacement of specific proteins from exported mRNA at (or immediately after) NPC transit. The mechanistic focus is on Dbp5-driven removal of export-associated factors such as Mex67–Mtr2 (major mRNA export receptor) and Nab2 (poly(A) RNA-binding/export factor), thereby enforcing directionality and enabling cytoplasmic fate decisions (alcazarroman2010controlofmrna pages 1-2, querl2023thedeadboxrna pages 1-3, rajan2023investigatingarole pages 25-29, noble2011thedbp5cycle pages 7-8).

2.3 Directionality of export (why remodeling matters)

mRNAs are exported by Mex67–Mtr2 interactions with NPC components. Directionality is established at the cytoplasmic NPC face, where Dbp5 activity promotes dissociation of export factors from the mRNP so that the particle cannot re-enter the nucleus using the same export-binding interactions (alcazarroman2010controlofmrna pages 1-2, querl2023thedeadboxrna pages 1-3, rajan2023investigatingarole pages 25-29).

3) Molecular function, reaction, and substrate specificity

3.1 Enzymatic activity (reaction)

Dbp5 catalyzes ATP hydrolysis (ATP → ADP + Pi) in an RNA-dependent manner, with its remodeling function associated with conformational changes across its nucleotide cycle (rajan2023investigatingarole pages 21-25, noble2011thedbp5cycle pages 7-8).

Quantitative enzymology and substrate-response features reported in the retrieved sources include:
- Basal ATPase rate reported in summarized mechanistic literature: ~0.04–0.14 s⁻¹, with RNA stimulating the ATPase cycle approximately 6–20-fold (rajan2023investigatingarole pages 21-25).
- RNA-binding is nucleotide-state sensitive; one cited assay summary reports AMP-PNP-bound RNA Kd ~40 nM, while RNA binding was not detectable with ADP in that context (rajan2023investigatingarole pages 21-25).
- Dbp5 shows a preference for ADP over ATP (reported as ~0.4 mM vs ~4 mM in a summarized mechanistic excerpt) (rajan2023investigatingarole pages 21-25).

3.2 RNA substrates: ssRNA (mRNA-like) vs structured RNA (tRNA/dsRNA)

A key 2024 development is evidence that Dbp5 can directly bind structured RNAs and participate in their export regulation:
- Dbp5 binds tRNA in vitro with Kd ~150 nM (Phe tRNA) and ~130 nM (mixed tRNA) (Rajan et al., eLife 2024-01, https://doi.org/10.7554/elife.89835). (rajan2024gle1isrequired pages 10-12)
- tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity, unlike a typical ssRNA activator (poly(A)). However, tRNA/dsRNA synergizes with Gle1/InsP6 to fully activate Dbp5, reaching ~1.03 ± 0.04 ATP/s (mixed tRNA with Gle1/InsP6) comparable to ssRNA activation (~1.11 ± 0.07 ATP/s) (rajan2024gle1isrequired pages 10-12).
- RNase T1 controls support that the Gle1/InsP6 + tRNA activation is attributable to structured RNA rather than ssRNA contamination (rajan2024gle1isrequired pages 10-12).

Interpretation: Dbp5 is best understood as an RNA-dependent ATPase whose productive hydrolysis is highly dependent on RNA topology and cofactor context; structured RNA can be a functional substrate when the NPC-anchored activation module (Gle1/InsP6) is present (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14).

4) Cellular localization and pathway context

4.1 Where Dbp5 acts

Dbp5 is enriched at the nuclear rim and is a key factor on the cytoplasmic face/cytoplasmic fibrils of the NPC, where terminal export remodeling is executed (querl2023thedeadboxrna pages 1-3, alcazarroman2010controlofmrna pages 1-2, hodge2011thedbp5cycle pages 9-10).

Dynamic behavior at NPCs is central to its mechanism:
- Dbp5 association with NPCs is highly dynamic, with ~0.8 s average residence time reported by FRAP in yeast (Hodge et al., Genes & Dev. 2011-05, https://doi.org/10.1101/gad.2041611). (hodge2011thedbp5cycle pages 9-10)

4.2 Timing relative to transport

Export remodeling by Dbp5 is proposed to occur at/after mRNP exit, consistent with rapid mRNP transit times:
- Reporter mRNP translocation through NPCs has been reported as ~0.2 s and <0.5 s in live-cell imaging studies discussed in the mechanistic framework (hodge2011thedbp5cycle pages 9-10).
- A mechanistic synthesis excerpt additionally notes conceptual rates such as an NPC exporting an mRNP every ~2–6 s, with transport lasting ~0.2 s (rajan2023investigatingarole pages 25-29).

5) Key interaction partners and regulatory cycle (Gle1–InsP6–Nup42–Nup159)

5.1 Gle1 + inositol hexakisphosphate (InsP6/IP6): essential ATPase activation module

At the cytoplasmic NPC face, Gle1 bound to IP6 acts as a principal Dbp5 ATPase coactivator required for full potentiation of Dbp5 function during export and translation-linked processes:
- Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by activating Dbp5 ATPase and promoting localized mRNP remodeling and directionality; they also report that the same module is required for proper translation termination (alcazarroman2010controlofmrna pages 1-2).
- Mechanistic genetic analysis indicates the Gle1–Dbp5 interaction is limiting/critical for export; dominant-negative RNA-binding mutants inhibit export by competing for Gle1 (Hodge et al. 2011) (hodge2011thedbp5cycle pages 9-10).

5.2 Nup42: enhancer/sensor coordinating Gle1 stimulation of Dbp5

Nup42’s key role is not simply Gle1 localization but enhancement of Gle1-dependent stimulation of the RNA-dependent Dbp5 ATPase:
- Adams et al. (Traffic 2017-10, https://doi.org/10.1111/tra.12526) report that Nup42/hNup42 enhances Gle1 stimulation of the RNA-dependent Dbp5/DDX19B ATPase, and that a nup42-CTD/gle1-CTD/Dbp5 trimeric complex forms in the presence of IP6 (adams2017nup42andip6 pages 6-7).
- They identify a minimal Nup42 Gle1-binding peptide of 17 amino acids (residues 408–424) and propose that Nup42 may couple Gle1–IP6 activation to the presence of Mex67-bound mRNPs (adams2017nup42andip6 pages 6-7).

5.3 Nup159: docking/recycling module and nucleotide-cycle control

Nup159 tethers Dbp5 to the NPC cytoplasmic filaments and is central to recycling by promoting ADP release, enabling additional rounds of remodeling:
- Noble et al. (Genes & Dev. 2011-05, https://doi.org/10.1101/gad.2040611) conclude that “a primary role for Nup159 in the Dbp5 cycle is to facilitate ADP release,” and show that ADP binding alone is sufficient to drive in vitro remodeling of Nab2-RNPs under their assay conditions (noble2011thedbp5cycle pages 7-8).
- A mechanistic synthesis excerpt reports that Dbp5–Nup159 affinity is nucleotide dependent (weakened in ADP/ATP states), with cited in vitro values changing from ~20 nM to ~0.6 μM (Dbp5ADP) and ~1 μM (Dbp5ATP) (rajan2023investigatingarole pages 25-29).

6) Biological processes and phenotypes supported by evidence

6.1 Canonical function: mRNA export and mRNP remodeling

Dbp5 is required for bulk mRNA export and acts at the NPC cytoplasmic face to remodel mRNPs by displacing export factors such as Mex67 and Nab2 (alcazarroman2010controlofmrna pages 1-2, querl2023thedeadboxrna pages 1-3, noble2011thedbp5cycle pages 7-8).

Dominant-negative and cycling mutants support a stepwise pathway:
- ATP binding is required for efficient NPC association, and RNA-binding–defective mutants can still localize at NPCs but inhibit export by sequestering Gle1 (hodge2011thedbp5cycle pages 9-10).
- Expression of a dominant-negative human analog (R372G) increases peripheral mRNP accumulation by ~10-fold, illustrating that interference with this step stalls mRNPs at/near NPCs (hodge2011thedbp5cycle pages 9-10).

6.2 Translation termination (Dbp5 as a post-export gene-expression regulator)

A key expert synthesis from 2023 emphasizes that Dbp5 couples export to downstream translation control:
- Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in translation termination, including a mechanistic model where Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough (querl2023thedeadboxrna pages 1-3, querl2023thedeadboxrna media ccdac9cd).
- Alcázar-Román et al. (2010) explicitly state Dbp5, Gle1, and IP6 are required for proper translation termination in addition to mRNA export (alcazarroman2010controlofmrna pages 1-2).

6.3 Cytoplasmic mRNA surveillance (NGD/NSD)

Querl & Krebber (2023) summarize a model in which Dbp5 contributes to no-go decay (NGD) and non-stop decay (NSD) by delivering rescue factors Dom34/Hbs1 to stalled ribosomes; subsequent hydrolysis steps coordinate rescue and transcript clearance (querl2023thedeadboxrna pages 4-5, querl2023thedeadboxrna media ccdac9cd).

6.4 tRNA export (2024 primary research)

Rajan et al. (eLife 2024-01) provide genetic and biochemical evidence that Dbp5 functions in tRNA export in a pathway parallel to canonical exporters:
- Dbp5 functions parallel to Los1 (and Gle1 supports pre-tRNA export), with a reported ~five-fold increase in a pre-tRNA processing intermediate/precursor ratio in los1Δ gle1-4 compared with los1Δ after 4 h at 37°C (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14).
- They propose that tRNA binding without ATPase stimulation could allow Dbp5 to escort/hold structured RNA until reaching NPC-localized Gle1/InsP6 for activation (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14).

6.5 Pre-ribosomal subunit export

Recent synthesis also places Dbp5 in pre-ribosomal export, with a model distinct from canonical mRNA remodeling:
- Rajan et al. (2024) explicitly contrast mRNA/tRNA export (requiring Gle1/InsP6 activation and remodeling at NPCs) with pre-ribosomal export, where Dbp5 ATPase stimulation may be dispensable and export factors may persist on the particle post-export (rajan2024gle1isrequired pages 12-14).
- Querl & Krebber (2023) depict a model where Dbp5 binds Mex67 on pre-ribosomal particles in the cytoplasm, “capturing” translocating subunits (querl2023thedeadboxrna media ccdac9cd).

7) Recent developments and latest research (prioritizing 2023–2024)

7.1 2023: Dbp5 as a multi-step gene-expression coupler

The 2023 minireview frames Dbp5 as a “master regulator” connecting mRNA export, translation termination, and quality control (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130). It provides an integrated conceptual model of Dbp5 at the NPC and on cytoplasmic ribosomes (querl2023thedeadboxrna pages 1-3, querl2023thedeadboxrna media ccdac9cd).

7.2 2024: structured RNA activation and tRNA export mechanism

The 2024 eLife paper extends Dbp5 function beyond mRNA remodeling by demonstrating:
- direct tRNA binding (Kd ~130–150 nM),
- lack of ATPase stimulation by structured RNA alone,
- strong Gle1/InsP6-dependent synergy restoring full ATPase activity (~1 ATP/s),
- in vivo genetic evidence for a Los1-independent pathway requiring the regulated Dbp5 ATPase cycle (https://doi.org/10.7554/elife.89835). (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14)

8) Current applications and real-world implementations

Dbp5 (and the conserved DDX19 module) is widely used as a paradigm for spatially gated mRNP remodeling at the nuclear pore, because it is one of the most mechanistically defined cases where an RNA-dependent ATPase is activated by NPC-localized cofactors (Gle1/InsP6) and recycled by a nucleoporin (Nup159) (alcazarroman2010controlofmrna pages 1-2, hodge2011thedbp5cycle pages 9-10, noble2011thedbp5cycle pages 7-8).

Practical research implementations supported by the cited sources include:
- In vitro reconstitution/enzymology of Dbp5 ATPase activation by defined RNAs and cofactors, including the structured-RNA synergy revealed in 2024 (rajan2024gle1isrequired pages 10-12).
- Live-cell imaging / FRAP to quantify Dbp5 NPC residence (~0.8 s) and relate it to export kinetics (hodge2011thedbp5cycle pages 9-10).
- Genetic dissection using dominant-negative mutants competing for Gle1 and synthetic interactions (hodge2011thedbp5cycle pages 9-10).

9) Expert opinions and authoritative analysis

Querl & Krebber (2023) synthesize that Dbp5 couples multiple steps in gene expression—export, translation termination, and cytoplasmic mRNA quality control—emphasizing a systems-level view while still anchored in the Gle1/InsP6/Nup159-controlled enzymatic cycle at the NPC (querl2023thedeadboxrna pages 1-3, querl2023thedeadboxrna pages 4-5).
Alcázar-Román et al. (2010) provide an authoritative mechanistic statement that Gle1–IP6 activation of Dbp5 is essential for directional export and also required for translation termination, implying the same cofactor module coordinates distinct downstream gene-expression checkpoints (alcazarroman2010controlofmrna pages 1-2).

10) Key statistics and data (recent and foundational)

A non-exhaustive quantitative summary (all values drawn from retrieved text excerpts) includes:
- Dbp5 ATPase kinetics: basal ~0.04–0.14 s⁻¹; RNA stimulation ~6–20× (rajan2023investigatingarole pages 21-25).
- Structured RNA binding/activation (2024): tRNA Kd ~130–150 nM; Gle1/InsP6+tRNA ATPase ~1.03 ± 0.04 ATP/s; ssRNA (pA) with Gle1/InsP6 ~1.11 ± 0.07 ATP/s (rajan2024gle1isrequired pages 10-12).
- NPC dynamics: Dbp5 average NPC residence ~0.8 s (FRAP) (hodge2011thedbp5cycle pages 9-10).
- Transport times discussed in mechanistic framework: mRNP translocation ~0.2 s and <0.5 s (hodge2011thedbp5cycle pages 9-10).
- Regulatory complex feature: minimal Nup42 Gle1-binding peptide is 17 aa (408–424) (adams2017nup42andip6 pages 6-7).
- Genetic/processing effect (2024): los1Δ gle1-4 shows ~5-fold increase in a pre-tRNA processing ratio relative to los1Δ alone after 4 h at 37°C (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14).

11) Evidence map (table)

The following table consolidates Dbp5’s functional roles, partners, localization, quantitative data, and references.

Biological role/process	Molecular function / mechanistic concept	Key partners/regulators	Cellular localization	Key quantitative data	Evidence type	Key reference with publication date and URL
Identity / core enzymology	Essential DEAD-box ATPase/RNA helicase (RNPase) that uses nucleotide-dependent conformational cycling to bind RNA and remodel RNA–protein complexes; ATP-bound state has higher RNA affinity than ADP-bound state, and ATP hydrolysis/conversion to ADP is linked to remodeling competence (rajan2023investigatingarole pages 21-25, hodge2011thedbp5cycle pages 9-10, noble2011thedbp5cycle pages 7-8)	ATP, RNA; regulated by Gle1-InsP6 and Nup159 (rajan2023investigatingarole pages 21-25, noble2011thedbp5cycle pages 7-8)	Nucleus, cytoplasm, prominent enrichment at nuclear rim / cytoplasmic face of NPC (querl2023thedeadboxrna pages 1-3, rajan2023investigatingarole pages 17-21)	Basal ATPase ~0.04–0.14 s⁻¹; RNA stimulation ~6–20-fold; Dbp5 favors ADP ~0.4 mM over ATP ~4 mM; AMP-PNP-bound RNA-binding K_d ~40 nM; RNA binding not detectable with ADP in cited assay (rajan2023investigatingarole pages 21-25)	Biochemistry, structural inference, review	Querl & Krebber, 2023-07-13, https://doi.org/10.1515/hsz-2023-0130 ; mechanistic synthesis from Rajan thesis excerpts 2023 (rajan2023investigatingarole pages 21-25)
Bulk mRNA export / export directionality	Dbp5 remodels emerging mRNPs at the cytoplasmic NPC face, removing export factors to prevent nuclear re-entry and enforce one-way export; remodeling includes displacement/removal of Mex67-Mtr2 and Nab2 from exported mRNPs (alcazarroman2010controlofmrna pages 1-2, querl2023thedeadboxrna pages 1-3, rajan2023investigatingarole pages 25-29, rajan2023investigatingarolea pages 25-29)	Mex67-Mtr2, Nab2, Gle1, InsP6/IP6, Nup42, Nup159 (alcazarroman2010controlofmrna pages 1-2, querl2023thedeadboxrna pages 1-3, adams2017nup42andip6 pages 6-7)	Cytoplasmic fibrils / cytoplasmic side of NPC (alcazarroman2010controlofmrna pages 1-2, querl2023thedeadboxrna pages 1-3)	Reporter mRNP translocation through NPC reported as ~0.2 s and <0.5 s; Dbp5 residence at NPC ~0.8 s by FRAP; NPC exports an mRNP every ~2–6 s (hodge2011thedbp5cycle pages 9-10, rajan2023investigatingarole pages 25-29)	Genetics, imaging, biochemistry, review	Hodge et al., 2011-05, https://doi.org/10.1101/gad.2041611 ; Alcázar-Román et al., 2010-05-28, https://doi.org/10.1074/jbc.M109.082370 ; Querl & Krebber, 2023-07-13, https://doi.org/10.1515/hsz-2023-0130
mRNP remodeling reaction	In this context, “mRNP remodeling” means Dbp5-driven displacement/restructuring of mRNP components, especially release of export adaptors from RNA; in vitro, ADP-bound/conversion-to-ADP states are remodeling-competent for Nab2-RNP remodeling (noble2011thedbp5cycle pages 7-8, rajan2023investigatingarole pages 25-29)	Nab2, RNA, nucleotide state; Gle1-InsP6 promotes productive cycling (noble2011thedbp5cycle pages 7-8, rajan2023investigatingarole pages 21-25)	Cytoplasmic NPC face (rajan2024gle1isrequired pages 12-14, lari2019investigationofmrnp pages 154-157)	Initial Dbp5–ADP on-rate estimate in in vitro remodeling assay: ~7.3% of total ADP bound per min; distinct Dbp5-ADP CD peak at ~260–270 nm (noble2011thedbp5cycle pages 7-8)	In vitro biochemistry, biophysics	Noble et al., 2011-05, https://doi.org/10.1101/gad.2040611
Gle1 / InsP6-dependent ATPase activation	Gle1 bound to InsP6/IP6 is the principal activator/coactivator of Dbp5 ATPase at the NPC; promotes ATP binding/stimulation and supports full potentiation required for mRNA export and translation termination (alcazarroman2010controlofmrna pages 1-2, hodge2011thedbp5cycle pages 9-10, noble2011thedbp5cycle pages 7-8)	Gle1, InsP6/IP6, RNA; coordinated by Nup42 (alcazarroman2010controlofmrna pages 1-2, adams2017nup42andip6 pages 6-7)	Cytoplasmic side of NPC, where Gle1 localizes (alcazarroman2010controlofmrna pages 1-2)	In structured-RNA assays, Gle1/InsP6 raises Dbp5 ATPase to 1.03 ± 0.04 ATP/s with mixed tRNA vs 1.11 ± 0.07 ATP/s with ssRNA; with RNase T1-treated tRNA, activity remains 1.18 ± 0.19 ATP/s (vs 1.19 ± 0.11 ATP/s untreated), showing activation depends on structured RNA rather than ssRNA contamination (rajan2024gle1isrequired pages 10-12)	Biochemistry, genetics	Alcázar-Román et al., 2010-05-28, https://doi.org/10.1074/jbc.M109.082370 ; Rajan et al., 2024-01, https://doi.org/10.7554/elife.89835
Nup159-regulated nucleotide recycling	Nup159 tethers Dbp5 at NPC cytoplasmic filaments and primarily facilitates ADP release / recycling after remodeling; Nup159 binding is incompatible with RNA binding and helps reset the cycle (noble2011thedbp5cycle pages 7-8, hodge2011thedbp5cycle pages 9-10, rajan2023investigatingarole pages 25-29)	Nup159, Dbp5-ADP, Gle1 (interaction weakened by Nup159 in cited synthesis) (noble2011thedbp5cycle pages 7-8, rajan2023investigatingarole pages 25-29)	NPC cytoplasmic filaments (hodge2011thedbp5cycle pages 9-10, querl2023thedeadboxrna pages 1-3)	Dbp5–Nup159 affinity changes from about ~20 nM to ~0.6 μM for Dbp5-ADP and ~1 μM for Dbp5-ATP in cited in vitro analyses; altered ADP-binding mutant bypasses Nup159 requirement (rajan2023investigatingarole pages 25-29, noble2011thedbp5cycle pages 7-8)	Biochemistry, genetics, FRAP/imaging	Noble et al., 2011-05, https://doi.org/10.1101/gad.2040611 ; Hodge et al., 2011-05, https://doi.org/10.1101/gad.2041611
Nup42 coordination of export remodeling	Nup42 does not primarily localize Gle1 but instead enhances Gle1-mediated stimulation of RNA-dependent Dbp5 ATPase; supports formation of a Nup42-CTD/Gle1-CTD/Dbp5 regulatory complex and couples remodeling to Mex67-bound mRNPs (adams2017nup42andip6 pages 6-7)	Nup42, Gle1, InsP6/IP6, Dbp5, Mex67-bound mRNPs (adams2017nup42andip6 pages 6-7)	Cytoplasmic NPC face (adams2017nup42andip6 pages 6-7)	Minimal Gle1-binding peptide in Nup42 is 17 aa (residues 408–424); no direct soluble Nup42–Dbp5 interaction detected in cited assay (adams2017nup42andip6 pages 6-7)	Biochemistry, cell biology	Adams et al., 2017-10, https://doi.org/10.1111/tra.12526
tRNA export (recent extension)	Dbp5 directly binds tRNA but tRNA alone does not stimulate ATPase; instead, tRNA + Gle1/InsP6 synergistically activates Dbp5, supporting a parallel Dbp5-dependent tRNA export pathway independent of Los1 (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14, rajan2024gle1isrequired pages 21-22)	tRNA, Gle1, InsP6/IP6, Los1-independent pathway; not dependent on Los1/Msn5/Mex67 for Dbp5 recruitment to tRNA in vivo (rajan2024gle1isrequired pages 21-22, rajan2024gle1isrequired pages 12-14)	Likely exported through NPC with activation at cytoplasmic face (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14)	tRNA-binding K_d ~150 nM (Phe tRNA) and ~130 nM (mixed tRNA); tRNA alone does not stimulate ATPase, whereas with Gle1/InsP6 ATPase reaches 1.03 ± 0.04 ATP/s; los1Δ gle1-4 causes ~5-fold increase in pre-tRNA Ile UAU intermediate/precursor ratio after 4 h at 37°C (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14)	In vitro biochemistry, EMSA/fluorescence polarization, yeast genetics	Rajan et al., 2024-01, https://doi.org/10.7554/elife.89835
Translation termination	Dbp5 is required for efficient translation termination; model from yeast studies/review: Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1–eRF3 association, thereby reducing readthrough (querl2023thedeadboxrna pages 1-3, querl2023thedeadboxrna media ccdac9cd, rajan2023investigatingarolea pages 34-38)	eRF1, eRF3, Gle1, InsP6/IP6 (querl2023thedeadboxrna media ccdac9cd, rajan2023investigatingarolea pages 34-38)	Cytoplasm / translating ribosomes (querl2023thedeadboxrna pages 1-3, querl2023thedeadboxrna media ccdac9cd)	No direct kinetic constant in provided contexts; functional requirement supported by genetics and mechanistic review (querl2023thedeadboxrna pages 1-3, rajan2023investigatingarolea pages 34-38)	Genetics, review	Querl & Krebber, 2023-07-13, https://doi.org/10.1515/hsz-2023-0130 ; Alcázar-Román et al., 2010-05-28, https://doi.org/10.1074/jbc.M109.082370
Cytoplasmic mRNA surveillance (NGD/NSD)	Proposed role in no-go decay (NGD) and non-stop decay (NSD) by delivering Dom34/Hbs1 to stalled ribosomes; ATP/GTP hydrolysis steps then enable rescue and subunit splitting (querl2023thedeadboxrna pages 4-5, querl2023thedeadboxrna media ccdac9cd)	Dom34, Hbs1, Rli1 (querl2023thedeadboxrna pages 4-5, querl2023thedeadboxrna media ccdac9cd)	Cytoplasm, stalled ribosomes (querl2023thedeadboxrna pages 4-5, querl2023thedeadboxrna media ccdac9cd)	No supported numeric kinetic constants in provided contexts (querl2023thedeadboxrna pages 4-5)	In vivo/in vitro binding studies summarized in review	Querl & Krebber, 2023-07-13, https://doi.org/10.1515/hsz-2023-0130
Pre-ribosomal subunit export	Dbp5 also contributes to pre-ribosomal subunit export; review model suggests direct Mex67 binding captures translocating subunits in cytoplasm, and this role may be less dependent on canonical helicase remodeling than mRNA export (rajan2024gle1isrequired pages 12-14, querl2023thedeadboxrna media ccdac9cd, rajan2023investigatingarolea pages 106-108)	Mex67, pre-ribosomal particles (querl2023thedeadboxrna media ccdac9cd, rajan2023investigatingarolea pages 106-108)	Nuclear export route / cytoplasmic side of NPC (querl2023thedeadboxrna media ccdac9cd)	No quantitative values supported in provided contexts (rajan2024gle1isrequired pages 12-14, querl2023thedeadboxrna media ccdac9cd)	Review, prior genetics/cell biology summarized in review	Querl & Krebber, 2023-07-13, https://doi.org/10.1515/hsz-2023-0130

Table: This table summarizes the experimentally supported functions, mechanisms, partners, localization, and quantitative measurements for Saccharomyces cerevisiae Dbp5/Rat8 (UniProt P20449). It is useful as a compact evidence map linking Dbp5’s ATPase cycle to mRNA export, tRNA export, translation termination, and related RNA quality-control roles.

12) Visual summary (figure evidence)

A schematic summarizing Dbp5’s roles across export, translation termination, and quality control is provided in Figure 1 of Querl & Krebber (2023) (querl2023thedeadboxrna media ccdac9cd).

13) Limitations and open questions (evidence-grounded)

Mechanism of factor displacement: While the ATP→ADP conformational transition is repeatedly implicated as remodeling-competent, the exact physical mechanism by which Dbp5 displaces specific mRNP proteins remains incompletely resolved in the sources retrieved here (querl2023thedeadboxrna pages 1-3, noble2011thedbp5cycle pages 7-8).
Structured-RNA regulation beyond tRNA: The 2024 data imply Dbp5 can be activated on structured RNA substrates in a Gle1/InsP6-dependent manner, motivating broader tests for other structured/non-canonical RNA substrates in vivo (rajan2024gle1isrequired pages 12-14).
Nup42 coupling mechanism: Adams et al. (2017) propose sensor/coupling roles and a trimeric complex model, but note they could not yet determine whether certain steps occur directly vs indirectly, highlighting an unresolved regulatory mechanism at the NPC (adams2017nup42andip6 pages 6-7).

Reference list (with dates and URLs; see inline citations for evidence mapping)

Querl L, Krebber H. Biological Chemistry 2023 (published online 2023-07-13). https://doi.org/10.1515/hsz-2023-0130 (querl2023thedeadboxrna pages 1-3, querl2023thedeadboxrna pages 4-5, querl2023thedeadboxrna media ccdac9cd)
Rajan AAN, Asada R, Montpetit B. eLife 2024-01. https://doi.org/10.7554/elife.89835 (rajan2024gle1isrequired pages 10-12, rajan2024gle1isrequired pages 12-14)
Alcázar-Román AR, Bolger TA, Wente SR. J Biol Chem 2010-05-28. https://doi.org/10.1074/jbc.M109.082370 (alcazarroman2010controlofmrna pages 1-2)
Hodge CA et al. Genes & Development 2011-05. https://doi.org/10.1101/gad.2041611 (hodge2011thedbp5cycle pages 9-10)
Noble KN et al. Genes & Development 2011-05. https://doi.org/10.1101/gad.2040611 (noble2011thedbp5cycle pages 7-8)
Adams RL et al. Traffic 2017-10. https://doi.org/10.1111/tra.12526 (adams2017nup42andip6 pages 6-7)

References

(querl2023thedeadboxrna pages 1-3): Luisa Querl and Heike Krebber. The dead-box rna helicase dbp5 is a key protein that couples multiple steps in gene expression. Biological Chemistry, 404:845-850, Jul 2023. URL: https://doi.org/10.1515/hsz-2023-0130, doi:10.1515/hsz-2023-0130. This article has 7 citations and is from a peer-reviewed journal.
(alcazarroman2010controlofmrna pages 1-2): Abel R. Alcázar-Román, Timothy A. Bolger, and Susan R. Wente. Control of mrna export and translation termination by inositol hexakisphosphate requires specific interaction with gle1. Journal of Biological Chemistry, 285:16683-16692, May 2010. URL: https://doi.org/10.1074/jbc.m109.082370, doi:10.1074/jbc.m109.082370. This article has 95 citations and is from a domain leading peer-reviewed journal.
(hodge2011thedbp5cycle pages 9-10): Christine A. Hodge, Elizabeth J. Tran, Kristen N. Noble, Abel R. Alcazar-Roman, Rakefet Ben-Yishay, John J. Scarcelli, Andrew W. Folkmann, Yaron Shav-Tal, Susan R. Wente, and Charles N. Cole. The dbp5 cycle at the nuclear pore complex during mrna export i: dbp5 mutants with defects in rna binding and atp hydrolysis define key steps for nup159 and gle1. Genes & Development, 25:1052-1064, May 2011. URL: https://doi.org/10.1101/gad.2041611, doi:10.1101/gad.2041611. This article has 124 citations and is from a highest quality peer-reviewed journal.
(noble2011thedbp5cycle pages 7-8): Kristen N. Noble, Elizabeth J. Tran, Abel R. Alcázar-Román, Christine A. Hodge, Charles N. Cole, and Susan R. Wente. The dbp5 cycle at the nuclear pore complex during mrna export ii: nucleotide cycling and mrnp remodeling by dbp5 are controlled by nup159 and gle1. Genes & development, 25 10:1065-77, May 2011. URL: https://doi.org/10.1101/gad.2040611, doi:10.1101/gad.2040611. This article has 137 citations and is from a highest quality peer-reviewed journal.
(rajan2024gle1isrequired pages 10-12): Arvind Arul Nambi Rajan, Ryuta Asada, and Ben Montpetit. Gle1 is required for trna to stimulate dbp5 atpase activity in vitro and promote dbp5-mediated trna export in vivo in saccharomyces cerevisiae. eLife, Jan 2024. URL: https://doi.org/10.7554/elife.89835, doi:10.7554/elife.89835. This article has 1 citations and is from a domain leading peer-reviewed journal.
(rajan2023investigatingarole pages 21-25): A Arul Nambi Rajan. Investigating a role for the dead-box protein 5 (dbp5) in trna regulation. Unknown journal, 2023.
(rajan2023investigatingarole pages 25-29): A Arul Nambi Rajan. Investigating a role for the dead-box protein 5 (dbp5) in trna regulation. Unknown journal, 2023.
(rajan2024gle1isrequired pages 12-14): Arvind Arul Nambi Rajan, Ryuta Asada, and Ben Montpetit. Gle1 is required for trna to stimulate dbp5 atpase activity in vitro and promote dbp5-mediated trna export in vivo in saccharomyces cerevisiae. eLife, Jan 2024. URL: https://doi.org/10.7554/elife.89835, doi:10.7554/elife.89835. This article has 1 citations and is from a domain leading peer-reviewed journal.
(adams2017nup42andip6 pages 6-7): Rebecca L. Adams, Aaron C. Mason, Laura Glass, Aditi, and Susan R. Wente. Nup42 and ip₆ coordinate gle1 stimulation of dbp5/ddx19b for mrna export in yeast and human cells. Traffic, 18:776-790, Oct 2017. URL: https://doi.org/10.1111/tra.12526, doi:10.1111/tra.12526. This article has 56 citations and is from a peer-reviewed journal.
(querl2023thedeadboxrna media ccdac9cd): Luisa Querl and Heike Krebber. The dead-box rna helicase dbp5 is a key protein that couples multiple steps in gene expression. Biological Chemistry, 404:845-850, Jul 2023. URL: https://doi.org/10.1515/hsz-2023-0130, doi:10.1515/hsz-2023-0130. This article has 7 citations and is from a peer-reviewed journal.
(querl2023thedeadboxrna pages 4-5): Luisa Querl and Heike Krebber. The dead-box rna helicase dbp5 is a key protein that couples multiple steps in gene expression. Biological Chemistry, 404:845-850, Jul 2023. URL: https://doi.org/10.1515/hsz-2023-0130, doi:10.1515/hsz-2023-0130. This article has 7 citations and is from a peer-reviewed journal.
(rajan2023investigatingarole pages 17-21): A Arul Nambi Rajan. Investigating a role for the dead-box protein 5 (dbp5) in trna regulation. Unknown journal, 2023.
(rajan2023investigatingarolea pages 25-29): A Arul Nambi Rajan. Investigating a role for the dead-box protein 5 (dbp5) in trna regulation. Unknown journal, 2023.
(lari2019investigationofmrnp pages 154-157): Azra Lari. Investigation of mrnp export kinetics and gene expression regulation by the dead-box protein dbp5p in saccharomyces cerevisiae. Text, Jan 2019. URL: https://doi.org/10.7939/r3-4p4c-vj08, doi:10.7939/r3-4p4c-vj08. This article has 0 citations and is from a peer-reviewed journal.
(rajan2024gle1isrequired pages 21-22): Arvind Arul Nambi Rajan, Ryuta Asada, and Ben Montpetit. Gle1 is required for trna to stimulate dbp5 atpase activity in vitro and promote dbp5-mediated trna export in vivo in saccharomyces cerevisiae. eLife, Jan 2024. URL: https://doi.org/10.7554/elife.89835, doi:10.7554/elife.89835. This article has 1 citations and is from a domain leading peer-reviewed journal.
(rajan2023investigatingarolea pages 34-38): A Arul Nambi Rajan. Investigating a role for the dead-box protein 5 (dbp5) in trna regulation. Unknown journal, 2023.
(rajan2023investigatingarolea pages 106-108): A Arul Nambi Rajan. Investigating a role for the dead-box protein 5 (dbp5) in trna regulation. Unknown journal, 2023.

Artifacts

Edison artifact artifact-00

Citations

rajan2023investigatingarole pages 21-25
rajan2023investigatingarole pages 25-29
alcazarroman2010controlofmrna pages 1-2
querl2023thedeadboxrna pages 4-5
querl2023thedeadboxrna pages 1-3
rajan2023investigatingarole pages 17-21
rajan2023investigatingarolea pages 25-29
lari2019investigationofmrnp pages 154-157
rajan2023investigatingarolea pages 34-38
rajan2023investigatingarolea pages 106-108
https://doi.org/10.1515/hsz-2023-0130;
https://doi.org/10.1074/jbc.M109.082370;
https://doi.org/10.1101/gad.2041611;
https://doi.org/10.1101/gad.2040611;
https://doi.org/10.7554/elife.89835
https://doi.org/10.1101/gad.2041611
https://doi.org/10.1074/jbc.M109.082370
https://doi.org/10.1111/tra.12526
https://doi.org/10.1101/gad.2040611
https://doi.org/10.1515/hsz-2023-0130
https://doi.org/10.1515/hsz-2023-0130,
https://doi.org/10.1074/jbc.m109.082370,
https://doi.org/10.1101/gad.2041611,
https://doi.org/10.1101/gad.2040611,
https://doi.org/10.7554/elife.89835,
https://doi.org/10.1111/tra.12526,
https://doi.org/10.7939/r3-4p4c-vj08,

📄 View Raw YAML

---
id: P20449
gene_symbol: DBP5
product_type: PROTEIN
status: INITIALIZED
taxon:
  id: NCBITaxon:559292
  label: Saccharomyces cerevisiae
description: DBP5 is an essential DEAD-box RNA helicase that functions as a key factor
  in mRNA nuclear export. It acts at the cytoplasmic face of the nuclear pore complex
  where it remodels mRNP complexes and facilitates mRNA release. The protein is activated
  by interaction with Gle1 and inositol hexakisphosphate (InsP6) at the NPC. Beyond
  its primary role in mRNA export, DBP5 also participates in tRNA export and has secondary
  roles in translation termination.
existing_annotations:
  - term:
      id: GO:0003724
      label: RNA helicase activity
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: DBP5 is a well-characterized DEAD-box RNA helicase with demonstrated
        ATP-dependent RNA unwinding activity. The IBA annotation is supported by extensive
        experimental evidence from multiple species, representing a core molecular
        function conserved across eukaryotes.
      action: ACCEPT
      reason: This is a core function of DBP5. The DEAD-box helicase family is defined
        by this activity. The protein contains the diagnostic DEAD box motif and Q
        motif characteristic of this helicase class. IBA reflects legitimate phylogenetic
        inference of this conserved catalytic domain function.
      supported_by:
        - reference_id: PMID:9564047
          supporting_text: It is shown here that Dbp5p is an ATP-dependent RNA helicase
            required for polyadenylated [poly(A)+] RNA export.
        - reference_id: PMID:9564048
          supporting_text: Dbp5p/Rat8p, a previously uncharacterized member of the
            DEAD-box family of proteins, is closely related to eukaryotic initiation
            factor 4A(eIF4A) an RNA helicase essential for protein synthesis initiation.
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Dbp5 is a DEAD-box RNA helicase-family protein whose core activity is **RNA-dependent ATP hydrolysis** coupled to **nucleotide-state–dependent conformational cycling**, enabling binding and remodeling of RNA–protein complexes (RNPs) rather than long-range processive duplex unwinding. In the export context, this remodeling function is often described as an **RNPase** activity acting on messenger RNPs at the NPC
  - term:
      id: GO:0003729
      label: mRNA binding
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: DBP5 binds mRNA as part of its catalytic mechanism for helicase activity.
        However, this annotation is overly generic for a protein whose function is
        specifically remodeling mRNP complexes. The binding represents a means to
        the mechanistic end of mRNA remodeling and export, not a separate function.
      action: KEEP_AS_NON_CORE
      reason: While DBP5 does bind mRNA, describing this as a separate function obscures
        the more informative molecular mechanism. DBP5 binds mRNA transiently as substrate
        for ATP-dependent unwinding during the mRNA export process. The IBA annotation
        is technically correct but less informative than the actual catalytic function
        (RNA helicase activity). This should not be listed as a core function alongside
        the helicase activity, as it is subsidiary to that activity.
      supported_by:
        - reference_id: PMID:9564047
          supporting_text: It is shown here that Dbp5p is an ATP-dependent RNA helicase
            required for polyadenylated [poly(A)+] RNA export.
        - reference_id: PMID:9564047
          supporting_text: Dbp5p may play a role in unloading or remodeling messenger
            RNA particles (mRNPs) upon arrival in the cytoplasm
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: DBP5 localizes to the nucleus and specifically to the nuclear pore
        complex region. The IBA annotation reflects this well-documented subcellular
        localization pattern.
      action: ACCEPT
      reason: While DBP5 is primarily cytoplasmic, it does accumulate at the nuclear
        pore complex on the cytoplasmic side and transiently associates with nuclear
        structures. The IBA annotation is appropriate for phylogenetic inference of
        documented subcellular localization.
      supported_by:
        - reference_id: PMID:9564048
          supporting_text: Dbp5p/Rat8p is located within the cytoplasm and concentrated
            in the perinuclear region. Analysis of the distribution of Dbp5p/Rat8p
            in yeast strains where nuclear pore complexes are tightly clustered indicated
            that a fraction of this protein associates with nuclear pore complexes
            (NPCs).
  - term:
      id: GO:0010494
      label: cytoplasmic stress granule
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: DBP5 has been observed in cytoplasmic stress granules, which is consistent
        with the protein's broader role in mRNA remodeling and processing. This represents
        a secondary cellular role.
      action: KEEP_AS_NON_CORE
      reason: DBP5's presence in stress granules represents a stress-response localization
        of the protein rather than a core catalytic function. This is a conditional,
        non-essential aspect of DBP5 biology. The protein's primary function is mRNA
        export, with stress granule association being a secondary phenomenon.
      supported_by:
        - reference_id: PMID:27251550
          supporting_text: Defects in THO/TREX-2 function cause accumulation of novel
            cytoplasmic mRNP granules
  - term:
      id: GO:0016973
      label: poly(A)+ mRNA export from nucleus
    evidence_type: IBA
    original_reference_id: GO_REF:0000033
    review:
      summary: DBP5 is a key factor in mRNA export from the nucleus. The poly(A)+
        specificity reflects the well-characterized role of DBP5 in the export of
        mature, polyadenylated mRNAs. The IBA annotation appropriately represents
        this core function.
      action: ACCEPT
      reason: This is a primary core function of DBP5. Extensive experimental evidence
        demonstrates that DBP5 is essential for mRNA export, specifically acting on
        poly(A)+ mRNAs at the cytoplasmic face of the nuclear pore complex. The phylogenetic
        inference is appropriate for this conserved and well-documented function.
      supported_by:
        - reference_id: PMID:9564047
          supporting_text: Dbp5p is an ATP-dependent RNA helicase required for polyadenylated
            [poly(A)+] RNA export.
        - reference_id: PMID:9564048
          supporting_text: In rat8 mutant strains, cells displayed rapid, synchronous
            accumulation of poly(A)+ RNA in nuclei when shifted to the non-permissive
            temperature.
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            The mechanistic focus is on Dbp5-driven removal of export-associated factors such as **Mex67–Mtr2** (major mRNA export receptor) and **Nab2** (poly(A) RNA-binding/export factor), thereby enforcing directionality and enabling cytoplasmic fate decisions
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Directionality is established at the **cytoplasmic NPC face**, where Dbp5 activity promotes dissociation of export factors from the mRNP so that the particle **cannot re-enter the nucleus using the same export-binding interactions**
  - term:
      id: GO:0000166
      label: nucleotide binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: DBP5 is an ATP-dependent enzyme that requires nucleotide binding for
        catalytic activity. This is a predictable annotation based on the helicase
        domain and ATP-binding motifs.
      action: KEEP_AS_NON_CORE
      reason: While technically correct, nucleotide binding is a subsidiary property
        of ATP-dependent enzymes. This is less informative than the actual ATP binding
        term and should not be emphasized as a core function.
  - term:
      id: GO:0003676
      label: nucleic acid binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000002
    review:
      summary: DBP5 binds nucleic acid (RNA) as part of its helicase mechanism. The
        InterPro mapping is appropriate for this conserved domain property.
      action: KEEP_AS_NON_CORE
      reason: This is a parent term of RNA binding and is appropriate but redundant
        with more specific annotations. RNA binding subsumes this annotation.
  - term:
      id: GO:0003723
      label: RNA binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: DBP5 binds RNA as substrate for helicase activity. This is documented
        from domain analysis and experimental evidence.
      action: KEEP_AS_NON_CORE
      reason: RNA binding is a mechanistic property subsidiary to the primary helicase
        activity. Should not be listed as a core function separately from the catalytic
        activity.
  - term:
      id: GO:0003724
      label: RNA helicase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: DBP5 helicase activity is correctly inferred from domain annotation
        and sequence homology. This IEA annotation duplicates the IBA and IDA annotations
        already present.
      action: ACCEPT
      reason: While redundant with IBA and IDA annotations for the same term, this
        IEA annotation is correct and appropriately supported by InterPro mapping.
        Multiple evidence codes for the same well-established function is acceptable
        in GO.
  - term:
      id: GO:0004386
      label: helicase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: DBP5 is a helicase with nucleic acid unwinding activity. This is a
        parent term to RNA helicase activity.
      action: ACCEPT
      reason: This is a correct characterization of DBP5 as a helicase. While more
        general than RNA helicase activity, it appropriately represents the broader
        catalytic class.
  - term:
      id: GO:0005524
      label: ATP binding
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: DBP5 contains a DEAD box domain with ATP binding site. This binding
        is essential for the helicase mechanism.
      action: ACCEPT
      reason: ATP binding is a core mechanistic feature of DEAD-box helicases and
        is well-documented in the protein structure and function. This is appropriate
        to retain.
  - term:
      id: GO:0005643
      label: nuclear pore
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: DBP5 is associated with the nuclear pore complex, specifically on the
        cytoplasmic face. The subcellular location annotation is appropriate.
      action: ACCEPT
      reason: DBP5 is indeed a component of the nuclear pore export machinery. The
        annotation correctly represents the structural context where the protein operates.
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IEA
    original_reference_id: GO_REF:0000120
    review:
      summary: DBP5 localizes primarily to the cytoplasm, where it resides both diffusely
        and at the nuclear pore complex.
      action: ACCEPT
      reason: Appropriate subcellular localization annotation confirmed by experimental
        data. The cytoplasmic localization is essential for its mRNA export function.
  - term:
      id: GO:0010467
      label: gene expression
    evidence_type: IEA
    original_reference_id: GO_REF:0000117
    review:
      summary: DBP5 contributes to gene expression by facilitating mRNA export, which
        is downstream of transcription and essential for protein synthesis.
      action: MARK_AS_OVER_ANNOTATED
      reason: While DBP5 is involved in the post-transcriptional steps of gene expression,
        this annotation is overly broad and generic. DBP5 is not directly involved
        in transcription, translation initiation, or other early gene expression steps.
        The term obscures the specific mRNA export function.
  - term:
      id: GO:0015031
      label: protein transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: DBP5 is annotated as protein transport based on general transport keywords.
        However, DBP5 specifically transports RNA, not proteins.
      action: REMOVE
      reason: This annotation is mechanistically incorrect. DBP5 facilitates mRNA
        transport, not protein transport. The mRNA is transported as an mRNP complex,
        but the cargo is RNA, not protein. This should be removed in favor of more
        accurate mRNA transport annotations.
  - term:
      id: GO:0016787
      label: hydrolase activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: DBP5 is an ATP-dependent enzyme with ATP hydrolysis activity as part
        of its catalytic mechanism. This parent term is appropriate.
      action: ACCEPT
      reason: Hydrolase activity is the correct parent classification for ATP-dependent
        enzymes including helicases. This annotation accurately represents the enzymatic
        class.
  - term:
      id: GO:0016887
      label: ATP hydrolysis activity
    evidence_type: IEA
    original_reference_id: GO_REF:0000116
    review:
      summary: DBP5 catalyzes ATP hydrolysis coupled to RNA unwinding. The Rhea mapping
        appropriately captures this catalytic activity.
      action: ACCEPT
      reason: This accurately represents the ATP hydrolysis catalytic activity. DEAD-box
        helicases use ATP hydrolysis to power RNA unwinding, making this annotation
        both appropriate and informative.
  - term:
      id: GO:0031965
      label: nuclear membrane
    evidence_type: IEA
    original_reference_id: GO_REF:0000044
    review:
      summary: DBP5 associates with the nuclear pore complex, which is embedded in
        the nuclear membrane. The localization annotation is appropriate.
      action: ACCEPT
      reason: The nuclear membrane is the structural context where the nuclear pore
        complex resides. DBP5 peripheral association with the nuclear pore complex
        on the cytoplasmic face makes this annotation appropriate.
  - term:
      id: GO:0051028
      label: mRNA transport
    evidence_type: IEA
    original_reference_id: GO_REF:0000043
    review:
      summary: DBP5 functions in mRNA transport from nucleus to cytoplasm. This process
        term appropriately captures DBP5's role in mRNA export.
      action: ACCEPT
      reason: mRNA transport is an appropriate process annotation for DBP5. While
        more general than the specific poly(A)+ mRNA export annotation, it correctly
        characterizes the biological process.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:15619606
    review:
      summary: DBP5 physically interacts with multiple protein partners including
        Zds1p and Gfd1p (Ymr255p). These protein-protein interactions are documented
        by experimental methods. However, generic protein binding term is uninformative.
      action: REMOVE
      reason: While the protein binding is documented, this annotation is overly generic
        and uninformative. The specific binding partners (Zds1p, Gfd1p) are known
        and documented in UniProt. Rather than generic protein binding, the annotations
        should focus on the functional roles of these interactions in mRNA export
        and complex assembly. Generic protein binding terms should be avoided per
        GO best practices.
      supported_by:
        - reference_id: PMID:15619606
          supporting_text: 2004 Dec 24. Physical and genetic interactions link the
            yeast protein Zds1p with mRNA nuclear export.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:16554755
    review:
      summary: Protein binding annotation from large-scale yeast protein interaction
        study. While interactions are documented, the generic nature of the annotation
        is not informative.
      action: REMOVE
      reason: Generic protein binding annotations are not recommended per GO guidelines.
        Large-scale interaction studies should be represented at the level of specific,
        named binding partners and their functional roles.
      supported_by:
        - reference_id: PMID:16554755
          supporting_text: Global landscape of protein complexes in the yeast Saccharomyces
            cerevisiae.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:19805289
    review:
      summary: DBP5 interacts with Gle1p, its primary regulatory partner. This interaction
        is essential for DBP5 activation and mRNA export function.
      action: REMOVE
      reason: While the Gle1p interaction is critical, generic protein binding obscures
        this specific and important interaction. This would be better represented
        as a specific protein binding annotation for Gle1p, or better yet, as the
        functional consequence (activation by Gle1p and InsP6).
      supported_by:
        - reference_id: PMID:19805289
          supporting_text: Structure of the C-terminus of the mRNA export factor Dbp5
            reveals the interaction surface for the ATPase activator Gle1.
  - term:
      id: GO:0005515
      label: protein binding
    evidence_type: IPI
    original_reference_id: PMID:21441902
    review:
      summary: Protein binding annotation from study of DEAD-box ATPase activation
        mechanism. The specific partners are nucleoporins and Gle1p involved in mRNA
        export.
      action: REMOVE
      reason: The generic protein binding term obscures the mechanistic importance
        of these interactions. While interactions are documented, they should be represented
        through their functional roles in mRNA export rather than as generic protein
        binding.
      supported_by:
        - reference_id: PMID:21441902
          supporting_text: A conserved mechanism of DEAD-box ATPase activation by
            nucleoporins and InsP6 in mRNA export.
  - term:
      id: GO:0006409
      label: tRNA export from nucleus
    evidence_type: IDA
    original_reference_id: PMID:31453808
    review:
      summary: |-
        Evidence demonstrates that DBP5 has a function in tRNA export from the nucleus,
        in addition to its well-characterized mRNA export role. Falcon deep research
        (Rajan et al. 2024, eLife) adds biochemical and genetic detail: Dbp5 directly
        binds tRNA (Kd ~130-150 nM), but tRNA/dsRNA alone does not stimulate its ATPase;
        instead tRNA synergizes with Gle1/InsP6 to fully activate Dbp5, and Dbp5 acts in
        a Los1-independent pathway. This is a well-supported additional RNA export
        function rather than mere substrate promiscuity.
      action: KEEP_AS_NON_CORE
      reason: |-
        The evidence for tRNA export is solid and now mechanistically defined, but it
        represents a secondary function relative to the protein's primary and essential
        role in bulk poly(A)+ mRNA export. Dbp5 binds structured tRNA directly and is
        activated via the same Gle1/InsP6 module used for mRNA export, operating in a
        pathway parallel to and independent of the canonical exporter Los1. Retained as
        non-core because mRNA export, not tRNA export, defines the essential function.
      supported_by:
        - reference_id: PMID:31453808
          supporting_text: A nuclear role for the DEAD-box protein Dbp5 in tRNA export.
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Dbp5 binds tRNA in vitro with **Kd ~150 nM** (Phe tRNA) and **~130 nM** (mixed tRNA) (Rajan et al., eLife 2024-01, https://doi.org/10.7554/elife.89835).
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            **tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity**, unlike a typical ssRNA activator (poly(A)). However, **tRNA/dsRNA synergizes with Gle1/InsP6 to fully activate Dbp5**, reaching ~**1.03 ± 0.04 ATP/s** (mixed tRNA with Gle1/InsP6) comparable to ssRNA activation (~**1.11 ± 0.07 ATP/s**)
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Rajan et al. (eLife 2024-01) provide genetic and biochemical evidence that Dbp5 functions in tRNA export in a pathway parallel to canonical exporters:
  - term:
      id: GO:0003724
      label: RNA helicase activity
    evidence_type: IDA
    original_reference_id: PMID:9564047
    review:
      summary: Experimental evidence directly demonstrates DBP5 RNA helicase activity.
        The IDA annotation with PMID:9564047 is redundant with the IBA and IEA annotations
        for the same term, but provides direct experimental confirmation.
      action: ACCEPT
      reason: Multiple evidence codes for the same well-established function are appropriate.
        This IDA annotation provides direct experimental confirmation of the helicase
        activity.
      supported_by:
        - reference_id: PMID:9564047
          supporting_text: Dbp5p is an ATP-dependent RNA helicase required for polyadenylated
            [poly(A)+] RNA export.
  - term:
      id: GO:0010494
      label: cytoplasmic stress granule
    evidence_type: IDA
    original_reference_id: PMID:27251550
    review:
      summary: Experimental data shows DBP5 localizes to cytoplasmic stress granule-like
        structures under conditions of defective mRNA export.
      action: KEEP_AS_NON_CORE
      reason: This annotation represents a secondary, conditional localization. DBP5
        stress granule accumulation occurs in response to mRNA export defects, not
        as a primary cellular function. Should be marked as non-core.
      supported_by:
        - reference_id: PMID:27251550
          supporting_text: Defects in THO/TREX-2 function cause accumulation of novel
            cytoplasmic mRNP granules that can be cleared by autophagy.
  - term:
      id: GO:0016973
      label: poly(A)+ mRNA export from nucleus
    evidence_type: IMP
    original_reference_id: PMID:27385342
    review:
      summary: Experimental mutation and phenotypic analysis shows DBP5 is directly
        involved in mRNA export. Multiple IMP and IDA annotations confirm this core
        function.
      action: ACCEPT
      reason: This is a primary core function confirmed by multiple experimental methods.
        IMP annotations appropriately reflect the loss-of-function phenotype of DBP5
        mutations.
      supported_by:
        - reference_id: PMID:27385342
          supporting_text: Altered RNA processing and export lead to retention of
            mRNAs near transcription sites and nuclear pore complexes or within the
            nucleolus.
  - term:
      id: GO:0000822
      label: inositol hexakisphosphate binding
    evidence_type: IDA
    original_reference_id: PMID:16783363
    review:
      summary: DBP5 directly binds inositol hexakisphosphate (InsP6), an essential
        cofactor that activates its ATPase activity at the nuclear pore complex.
      action: ACCEPT
      reason: This represents a specific, mechanistically important ligand binding
        interaction. InsP6 is a cofactor required for DBP5 activation in mRNA export.
        The annotation appropriately represents this catalytic requirement.
      supported_by:
        - reference_id: PMID:16783363
          supporting_text: We now propose that Dbp5 activation at NPCs requires Gle1
            and InsP6.
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by **activating Dbp5 ATPase** and promoting localized mRNP remodeling and directionality; they also report that the same module is required for **proper translation termination**
  - term:
      id: GO:0005634
      label: nucleus
    evidence_type: IDA
    original_reference_id: PMID:15280434
    review:
      summary: DBP5 localizes to the nucleus and undergoes stress-dependent relocalization
        to nuclear regions under ethanol stress.
      action: ACCEPT
      reason: Appropriate experimental confirmation of nuclear localization. While
        DBP5 is primarily cytoplasmic, it does associate with nuclear structures,
        particularly under stress conditions.
      supported_by:
        - reference_id: PMID:15280434
          supporting_text: 'Jul 27. Stress response in yeast mRNA export factor: reversible
            changes in Rat8p localization are caused by ethanol stress but not heat
            shock.'
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:10610322
    review:
      summary: DBP5 is predominantly localized to the cytoplasm and is concentrated
        around the nuclear envelope at the cytoplasmic face of the nuclear pore complex.
      action: ACCEPT
      reason: The primary subcellular localization of DBP5 is cytoplasmic. This annotation
        appropriately reflects the experimental localization data.
      supported_by:
        - reference_id: PMID:10610322
          supporting_text: immunoelectron microscopy localizations indicate that Gle1p,
            Rip1p and Rat8p/Dbp5p are present on the NPC cytoplasmic fibrils
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:15280434
    review:
      summary: DBP5 cytoplasmic localization confirmed under stress conditions. Redundant
        with other cytoplasm annotations but provides condition-specific evidence.
      action: ACCEPT
      reason: Multiple lines of evidence confirm cytoplasmic localization under different
        conditions. Retention of redundant annotations is acceptable.
      supported_by:
        - reference_id: PMID:15280434
          supporting_text: 'Jul 27. Stress response in yeast mRNA export factor: reversible
            changes in Rat8p localization are caused by ethanol stress but not heat
            shock.'
  - term:
      id: GO:0005737
      label: cytoplasm
    evidence_type: IDA
    original_reference_id: PMID:9564048
    review:
      summary: DBP5 is located in the cytoplasm, concentrated in the perinuclear region.
      action: ACCEPT
      reason: Multiple evidence codes for the same subcellular localization reflect
        convergent experimental evidence from independent studies.
      supported_by:
        - reference_id: PMID:9564048
          supporting_text: Dbp5p/Rat8p is located within the cytoplasm and concentrated
            in the perinuclear region.
  - term:
      id: GO:0005934
      label: cellular bud tip
    evidence_type: IDA
    original_reference_id: PMID:19198597
    review:
      summary: DBP5 localizes to the cellular bud tip, possibly involved in directing
        mRNA and/or translation during mitosis.
      action: KEEP_AS_NON_CORE
      reason: While localization to bud tip is documented, this represents a specialized,
        conditional cellular location related to cell division. This is a secondary,
        non-essential aspect of DBP5 cellular distribution.
      supported_by:
        - reference_id: PMID:19198597
          supporting_text: Nuclear transport factor directs localization of protein
            synthesis during mitosis.
  - term:
      id: GO:0006406
      label: mRNA export from nucleus
    evidence_type: IMP
    original_reference_id: PMID:9564048
    review:
      summary: Experimental mutation phenotype shows DBP5 is essential for mRNA export
        from the nucleus. IMP annotation reflects the loss-of-function phenotype.
      action: ACCEPT
      reason: This is a primary core function confirmed by classical loss-of-function
        experiments. The IMP annotation appropriately represents the mutant phenotype.
      supported_by:
        - reference_id: PMID:9564048
          supporting_text: In rat8 mutant strains, cells displayed rapid, synchronous
            accumulation of poly(A)+ RNA in nuclei when shifted to the non-permissive
            temperature.
  - term:
      id: GO:0006415
      label: translational termination
    evidence_type: IGI
    original_reference_id: PMID:17272721
    review:
      summary: |-
        DBP5 shows genetic interaction with translation termination factors eRF1 and
        eRF3, indicating a role in translation termination beyond mRNA export. Falcon
        deep research (Querl & Krebber 2023 review) supports a defined mechanism in which
        Dbp5 delivers eRF1 to terminating ribosomes and prevents premature eRF1-eRF3
        interactions, thereby reducing readthrough. The same Gle1/InsP6 activation module
        that supports mRNA export is also required for proper translation termination.
      action: KEEP_AS_NON_CORE
      reason: |-
        The genetic interactions are documented, and falcon deep research indicates this
        is a direct, mechanistically defined coupled function rather than mere pleiotropy
        or an indirect consequence of mRNA export defects: Dbp5 is proposed to deliver
        eRF1 to terminating ribosomes and prevent premature eRF1-eRF3 association. It is
        retained as non-core because the essential, defining function of Dbp5 is bulk
        mRNA export at the NPC, with translation termination being one of several
        downstream gene-expression steps that Dbp5 couples.
      supported_by:
        - reference_id: PMID:17272721
          supporting_text: Dbp5 interacts genetically with both release factors and
            the polyadenlyate-binding protein Pab1.
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in **translation termination**, including a mechanistic model where Dbp5 delivers **eRF1** to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by **activating Dbp5 ATPase** and promoting localized mRNP remodeling and directionality; they also report that the same module is required for **proper translation termination**
  - term:
      id: GO:0006415
      label: translational termination
    evidence_type: IPI
    original_reference_id: PMID:17272721
    review:
      summary: |-
        DBP5 shows direct physical interaction with eRF1, a translation termination
        factor. The interaction is specifically detected and characterized. Falcon deep
        research supports a model in which Dbp5 delivers eRF1 to terminating ribosomes
        and prevents premature eRF1-eRF3 interactions, reducing stop-codon readthrough.
      action: KEEP_AS_NON_CORE
      reason: |-
        The physical interaction with eRF1 is documented and falcon deep research places
        it in a defined mechanistic model (Dbp5 delivers eRF1 and prevents premature
        eRF1-eRF3 association). Translation termination is retained as non-core because
        the protein's essential, defining function is bulk mRNA export at the nuclear
        pore complex; translation termination is one of the coupled downstream
        gene-expression steps.
      supported_by:
        - reference_id: PMID:17272721
          supporting_text: The DEAD-box RNA helicase Dbp5 functions in translation
            termination.
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in **translation termination**, including a mechanistic model where Dbp5 delivers **eRF1** to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough
  - term:
      id: GO:0008186
      label: ATP-dependent activity, acting on RNA
    evidence_type: IDA
    original_reference_id: PMID:19805289
    review:
      summary: DBP5 is directly shown to have ATP-dependent RNA-modifying activity.
        This reflects the core catalytic function of the helicase.
      action: ACCEPT
      reason: This annotation appropriately characterizes the ATP-dependent catalytic
        activity of DBP5 acting on RNA. It is both informative and accurate.
      supported_by:
        - reference_id: PMID:19805289
          supporting_text: Structure of the C-terminus of the mRNA export factor Dbp5
            reveals the interaction surface for the ATPase activator Gle1.
  - term:
      id: GO:0044614
      label: nuclear pore cytoplasmic filaments
    evidence_type: IDA
    original_reference_id: PMID:10610322
    review:
      summary: DBP5 is experimentally localized to the cytoplasmic filaments of the
        nuclear pore complex, where it functions in mRNA remodeling.
      action: ACCEPT
      reason: This annotation accurately represents the specific subcellular microlocalization
        of DBP5 within the NPC structure. It provides important detail about where
        the mRNA export activity occurs.
      supported_by:
        - reference_id: PMID:10610322
          supporting_text: immunoelectron microscopy localizations indicate that Gle1p,
            Rip1p and Rat8p/Dbp5p are present on the NPC cytoplasmic fibrils
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Dbp5 is enriched at the **nuclear rim** and is a key factor on the **cytoplasmic face/cytoplasmic fibrils of the NPC**, where terminal export remodeling is executed
        - reference_id: file:yeast/DBP5/DBP5-deep-research-falcon.md
          supporting_text: |-
            Dbp5 association with NPCs is highly dynamic, with **~0.8 s** average residence time reported by FRAP in yeast
core_functions:
  - molecular_function:
      id: GO:0003724
      label: RNA helicase activity
    directly_involved_in:
      - id: GO:0006406
        label: mRNA export from nucleus
      - id: GO:0016973
        label: poly(A)+ mRNA export from nucleus
    description: DBP5 catalyzes ATP-dependent RNA unwinding (helicase activity) as
      a core function, operating at the cytoplasmic filaments of the nuclear pore
      complex where it remodels mRNP complexes to facilitate mRNA export. The protein
      is a key component of the terminal step of mRNA export, where it removes mRNA-binding
      proteins and remodels the mRNP to allow passage through the NPC.
    supported_by:
      - reference_id: PMID:9564047
        supporting_text: Dbp5p is an ATP-dependent RNA helicase required for polyadenylated
          [poly(A)+] RNA export.
      - reference_id: PMID:9564048
        supporting_text: In rat8 mutant strains, cells displayed rapid, synchronous
          accumulation of poly(A)+ RNA in nuclei when shifted to the non-permissive
          temperature.
      - reference_id: PMID:10610322
        supporting_text: immunoelectron microscopy localizations indicate that Gle1p,
          Rip1p and Rat8p/Dbp5p are present on the NPC cytoplasmic fibrils
    in_complex:
      id: GO:0044614
      label: nuclear pore cytoplasmic filaments
  - molecular_function:
      id: GO:0000822
      label: inositol hexakisphosphate binding
    directly_involved_in:
      - id: GO:0016973
        label: poly(A)+ mRNA export from nucleus
    in_complex:
      id: GO:0005643
      label: nuclear pore
    description: DBP5 binds inositol hexakisphosphate (InsP6) as a critical cofactor
      for activation at the nuclear pore complex. InsP6 binding is mediated by the
      nucleoporin Gle1 and is essential for efficient mRNA export. This interaction
      provides spatial and mechanistic control of DBP5 ATPase activity.
    supported_by:
      - reference_id: PMID:16783363
        supporting_text: We now propose that Dbp5 activation at NPCs requires Gle1
          and InsP6.
      - reference_id: PMID:21441902
        supporting_text: A conserved mechanism of DEAD-box ATPase activation by nucleoporins
          and InsP6 in mRNA export.
references:
  - id: GO_REF:0000002
    title: Gene Ontology annotation through association of InterPro records with GO
      terms
    findings: []
  - 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:0000116
    title: Automatic Gene Ontology annotation based on Rhea mapping
    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:10610322
    title: The RNA export factor Gle1p is located on the cytoplasmic fibrils of the
      NPC and physically interacts with the FG-nucleoporin Rip1p, the DEAD-box protein
      Rat8p/Dbp5p and a new protein Ymr 255p.
    findings: []
  - id: PMID:15280434
    title: 'Stress response in yeast mRNA export factor: reversible changes in Rat8p
      localization are caused by ethanol stress but not heat shock.'
    findings: []
  - id: PMID:15619606
    title: Physical and genetic interactions link the yeast protein Zds1p with mRNA
      nuclear export.
    findings: []
  - id: PMID:16554755
    title: Global landscape of protein complexes in the yeast Saccharomyces cerevisiae.
    findings: []
  - id: PMID:16783363
    title: Inositol hexakisphosphate and Gle1 activate the DEAD-box protein Dbp5 for
      nuclear mRNA export.
    findings: []
  - id: PMID:17272721
    title: The DEAD-box RNA helicase Dbp5 functions in translation termination.
    findings: []
  - id: PMID:19198597
    title: Nuclear transport factor directs localization of protein synthesis during
      mitosis.
    findings: []
  - id: PMID:19805289
    title: Structure of the C-terminus of the mRNA export factor Dbp5 reveals the
      interaction surface for the ATPase activator Gle1.
    findings: []
  - id: PMID:21441902
    title: A conserved mechanism of DEAD-box ATPase activation by nucleoporins and
      InsP6 in mRNA export.
    findings: []
  - id: PMID:27251550
    title: Defects in THO/TREX-2 function cause accumulation of novel cytoplasmic
      mRNP granules that can be cleared by autophagy.
    findings: []
  - id: PMID:27385342
    title: Altered RNA processing and export lead to retention of mRNAs near transcription
      sites and nuclear pore complexes or within the nucleolus.
    findings: []
  - id: PMID:31453808
    title: A nuclear role for the DEAD-box protein Dbp5 in tRNA export.
    findings: []
  - id: PMID:9564047
    title: Dbp5p, a cytosolic RNA helicase, is required for poly(A)+ RNA export.
    findings: []
  - id: PMID:9564048
    title: Dbp5p/Rat8p is a yeast nuclear pore-associated DEAD-box protein essential
      for RNA export.
    findings: []
  - id: file:yeast/DBP5/DBP5-deep-research-falcon.md
    title: Falcon deep research report on DBP5 (Saccharomyces cerevisiae Dbp5/Rat8,
      UniProt P20449)
    findings:
      - statement: |
          Dbp5/Rat8 is an essential DEAD-box ATP-dependent RNA helicase / RNA-dependent
          ATPase that acts at the cytoplasmic face of the nuclear pore complex (NPC)
          and is orthologous to metazoan DDX19.
        reference_section_type: RESULTS
        supporting_text: |-
          The literature summarized here is specifically for **Dbp5** (alias **Rat8**) from *Saccharomyces cerevisiae* (S288c), an essential **DEAD-box ATP-dependent RNA helicase/RNA-dependent ATPase** at the nuclear pore complex (NPC), orthologous to metazoan **DDX19**.
      - statement: |
          The core activity of Dbp5 is RNA-dependent ATP hydrolysis coupled to
          nucleotide-state-dependent conformational cycling, enabling binding and
          remodeling of RNA-protein complexes (RNPs) rather than long-range processive
          duplex unwinding; this remodeling is often described as an RNPase activity.
        reference_section_type: RESULTS
        supporting_text: |-
          Dbp5 is a DEAD-box RNA helicase-family protein whose core activity is **RNA-dependent ATP hydrolysis** coupled to **nucleotide-state–dependent conformational cycling**, enabling binding and remodeling of RNA–protein complexes (RNPs) rather than long-range processive duplex unwinding. In the export context, this remodeling function is often described as an **RNPase** activity acting on messenger RNPs at the NPC
      - statement: |
          mRNP remodeling by Dbp5 at the cytoplasmic NPC face removes export-associated
          factors such as Mex67-Mtr2 and Nab2 from exported mRNA, enforcing directionality.
        reference_section_type: RESULTS
        supporting_text: |-
          The mechanistic focus is on Dbp5-driven removal of export-associated factors such as **Mex67–Mtr2** (major mRNA export receptor) and **Nab2** (poly(A) RNA-binding/export factor), thereby enforcing directionality and enabling cytoplasmic fate decisions
      - statement: |
          Directionality of export is established at the cytoplasmic NPC face, where Dbp5
          activity promotes dissociation of export factors so the mRNP cannot re-enter
          the nucleus using the same export-binding interactions.
        reference_section_type: RESULTS
        supporting_text: |-
          Directionality is established at the **cytoplasmic NPC face**, where Dbp5 activity promotes dissociation of export factors from the mRNP so that the particle **cannot re-enter the nucleus using the same export-binding interactions**
      - statement: |
          Dbp5 catalyzes RNA-dependent ATP hydrolysis (ATP to ADP + Pi), with the
          remodeling function associated with conformational changes across its
          nucleotide cycle.
        reference_section_type: RESULTS
        supporting_text: |-
          Dbp5 catalyzes **ATP hydrolysis (ATP → ADP + Pi)** in an RNA-dependent manner, with its remodeling function associated with conformational changes across its nucleotide cycle
      - statement: |
          Gle1 bound to inositol hexakisphosphate (IP6) activates the Dbp5 ATPase and
          promotes localized mRNP remodeling and directionality; the same module is
          required for proper translation termination.
        reference_section_type: RESULTS
        supporting_text: |-
          Alcázar-Román et al. (JBC 2010-05-28, https://doi.org/10.1074/jbc.M109.082370) describe Gle1 and IP6 as essential for mRNA export by **activating Dbp5 ATPase** and promoting localized mRNP remodeling and directionality; they also report that the same module is required for **proper translation termination**
      - statement: |
          Nup159 tethers Dbp5 to NPC cytoplasmic filaments and primarily facilitates
          ADP release / recycling, enabling additional rounds of remodeling; ADP binding
          alone is sufficient to drive in vitro Nab2-RNP remodeling.
        reference_section_type: RESULTS
        supporting_text: |-
          Noble et al. (Genes & Dev. 2011-05, https://doi.org/10.1101/gad.2040611) conclude that “a primary role for Nup159 in the Dbp5 cycle is to facilitate ADP release,” and show that ADP binding alone is sufficient to drive in vitro remodeling of Nab2-RNPs under their assay conditions
      - statement: |
          Nup42 enhances Gle1-dependent stimulation of the RNA-dependent Dbp5 ATPase
          and supports formation of a Nup42-CTD/Gle1-CTD/Dbp5 trimeric complex in the
          presence of IP6.
        reference_section_type: RESULTS
        supporting_text: |-
          Adams et al. (Traffic 2017-10, https://doi.org/10.1111/tra.12526) report that Nup42/hNup42 enhances Gle1 stimulation of the RNA-dependent Dbp5/DDX19B ATPase, and that a **nup42-CTD/gle1-CTD/Dbp5 trimeric complex forms in the presence of IP6**
      - statement: |
          Dbp5 association with NPCs is highly dynamic, with an average residence time
          of approximately 0.8 s reported by FRAP in yeast.
        reference_section_type: RESULTS
        supporting_text: |-
          Dbp5 association with NPCs is highly dynamic, with **~0.8 s** average residence time reported by FRAP in yeast
      - statement: |
          Dbp5 directly binds tRNA in vitro (Kd ~150 nM Phe tRNA, ~130 nM mixed tRNA),
          but tRNA/dsRNA alone does not stimulate its ATPase; instead it synergizes with
          Gle1/InsP6 to fully activate Dbp5.
        reference_section_type: RESULTS
        supporting_text: |-
          Dbp5 binds tRNA in vitro with **Kd ~150 nM** (Phe tRNA) and **~130 nM** (mixed tRNA) (Rajan et al., eLife 2024-01, https://doi.org/10.7554/elife.89835).
      - statement: |
          tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity, unlike
          a typical ssRNA activator (poly(A)); tRNA/dsRNA synergizes with Gle1/InsP6 to
          fully activate Dbp5 to a level comparable with ssRNA activation.
        reference_section_type: RESULTS
        supporting_text: |-
          **tRNA (or dsRNA poly(I:C)) alone does not stimulate Dbp5 ATPase activity**, unlike a typical ssRNA activator (poly(A)). However, **tRNA/dsRNA synergizes with Gle1/InsP6 to fully activate Dbp5**, reaching ~**1.03 ± 0.04 ATP/s** (mixed tRNA with Gle1/InsP6) comparable to ssRNA activation (~**1.11 ± 0.07 ATP/s**)
      - statement: |
          Rajan et al. provide genetic and biochemical evidence that Dbp5 functions in
          tRNA export in a pathway parallel to canonical exporters (Los1-independent),
          with Gle1 supporting pre-tRNA export.
        reference_section_type: RESULTS
        supporting_text: |-
          Rajan et al. (eLife 2024-01) provide genetic and biochemical evidence that Dbp5 functions in tRNA export in a pathway parallel to canonical exporters:
      - statement: |
          Querl & Krebber (2023) review evidence that Dbp5 functions in translation
          termination via a model in which Dbp5 delivers eRF1 to terminating ribosomes
          and prevents premature eRF1-eRF3 interactions, thereby reducing readthrough.
        reference_section_type: RESULTS
        supporting_text: |-
          Querl & Krebber (Biological Chemistry, published online 2023-07-13, https://doi.org/10.1515/hsz-2023-0130) review evidence that Dbp5 functions in **translation termination**, including a mechanistic model where Dbp5 delivers **eRF1** to terminating ribosomes and prevents premature eRF1–eRF3 interactions, thereby reducing readthrough
      - statement: |
          Querl & Krebber (2023) summarize a model in which Dbp5 contributes to no-go
          decay (NGD) and non-stop decay (NSD) by delivering rescue factors Dom34/Hbs1
          to stalled ribosomes.
        reference_section_type: RESULTS
        supporting_text: |-
          Querl & Krebber (2023) summarize a model in which Dbp5 contributes to no-go decay (NGD) and non-stop decay (NSD) by delivering rescue factors **Dom34/Hbs1** to stalled ribosomes; subsequent hydrolysis steps coordinate rescue and transcript clearance
      - statement: |
          Recent synthesis places Dbp5 in pre-ribosomal subunit export, with a model
          where Dbp5 binds Mex67 on pre-ribosomal particles in the cytoplasm to capture
          translocating subunits; this role may be less dependent on canonical helicase
          remodeling than mRNA export.
        reference_section_type: RESULTS
        supporting_text: |-
          Recent synthesis also places Dbp5 in pre-ribosomal export, with a model distinct from canonical mRNA remodeling:

Gene Description

Existing Annotations Review

Core Functions

DBP5 binds inositol hexakisphosphate (InsP6) as a critical cofactor for activation at the nuclear pore complex. InsP6 binding is mediated by the nucleoporin Gle1 and is essential for efficient mRNA export. This interaction provides spatial and mechanistic control of DBP5 ATPase activity.

References

Deep Research

Falcon

Research Report: Functional Annotation of Saccharomyces cerevisiae DBP5/RAT8 (UniProt P20449)

1) Target verification (critical disambiguation)

2) Key concepts and definitions (current understanding)

2.1 DEAD-box ATPase / RNA helicase (what Dbp5 “does”)

2.2 “mRNP remodeling” in the Dbp5 pathway

2.3 Directionality of export (why remodeling matters)

3) Molecular function, reaction, and substrate specificity

3.1 Enzymatic activity (reaction)

3.2 RNA substrates: ssRNA (mRNA-like) vs structured RNA (tRNA/dsRNA)

4) Cellular localization and pathway context

4.1 Where Dbp5 acts

4.2 Timing relative to transport

5) Key interaction partners and regulatory cycle (Gle1–InsP6–Nup42–Nup159)

5.1 Gle1 + inositol hexakisphosphate (InsP6/IP6): essential ATPase activation module

5.2 Nup42: enhancer/sensor coordinating Gle1 stimulation of Dbp5

5.3 Nup159: docking/recycling module and nucleotide-cycle control

6) Biological processes and phenotypes supported by evidence

6.1 Canonical function: mRNA export and mRNP remodeling

6.2 Translation termination (Dbp5 as a post-export gene-expression regulator)

6.3 Cytoplasmic mRNA surveillance (NGD/NSD)

6.4 tRNA export (2024 primary research)

6.5 Pre-ribosomal subunit export

7) Recent developments and latest research (prioritizing 2023–2024)

7.1 2023: Dbp5 as a multi-step gene-expression coupler

7.2 2024: structured RNA activation and tRNA export mechanism

8) Current applications and real-world implementations

9) Expert opinions and authoritative analysis

10) Key statistics and data (recent and foundational)

11) Evidence map (table)

12) Visual summary (figure evidence)

13) Limitations and open questions (evidence-grounded)

Reference list (with dates and URLs; see inline citations for evidence mapping)

Artifacts

Citations

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