HSP10 encodes the essential mitochondrial matrix GroES/Cpn10 co-chaperonin that binds Hsp60, regulates the Hsp60 ATPase-driven folding chamber, promotes folding and assembly of imported matrix proteins, and supports sorting of selected proteins such as the Rieske Fe/S protein.
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
|
GO:0006457
protein folding
|
IBA
GO_REF:0000033 |
ACCEPT |
Summary: protein folding reviewed for HSP10: ACCEPT.
Reason: Retain as the principal biological process supported by Hsp10/Hsp60-dependent folding of imported mitochondrial proteins.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 acts with the mitochondrial chaperonin **Hsp60** to enable ATP-dependent folding and assembly of a subset of imported mitochondrial matrix proteins
|
|
GO:0005739
mitochondrion
|
IBA
GO_REF:0000033 |
ACCEPT |
Summary: mitochondrion reviewed for HSP10: ACCEPT.
Reason: Retain as broad mitochondrial localization.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria and investigated using isolated mitochondria import/folding/sorting assays
|
|
GO:0005759
mitochondrial matrix
|
IBA
GO_REF:0000033 |
ACCEPT |
Summary: mitochondrial matrix reviewed for HSP10: ACCEPT.
Reason: Retain as the precise core location for Hsp10 action with mitochondrial Hsp60.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Dubaquie et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with hsp60 in folding of imported proteins
|
|
GO:0051087
protein-folding chaperone binding
|
IBA
GO_REF:0000033 |
ACCEPT |
Summary: protein-folding chaperone binding reviewed for HSP10: ACCEPT.
Reason: Retain because Hsp10 physically and functionally binds the protein-folding chaperone Hsp60.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
yeast hsp10 is a heptameric co-chaperonin that binds nucleotide-dependently to the 14-mer hsp60 chaperonin
|
|
GO:0046872
metal ion binding
|
IBA
GO_REF:0000033 |
REMOVE |
Summary: metal ion binding reviewed for HSP10: REMOVE.
Reason: Remove; no reviewed yeast Hsp10 evidence supports independent metal-ion binding as part of its GroES-like co-chaperonin function.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 is the **co-chaperonin** partner of Group I chaperonins
|
|
GO:0051082
unfolded protein binding
|
IBA
GO_REF:0000033 |
MODIFY |
Summary: unfolded protein binding reviewed for HSP10: MODIFY.
Reason: Hsp10 primarily binds the Hsp60 chaperonin lid interface rather than generic unfolded substrates; protein-folding chaperone binding is more accurate.
Proposed replacements:
protein-folding chaperone binding
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
yeast hsp10 is a heptameric co-chaperonin that binds nucleotide-dependently to the 14-mer hsp60 chaperonin
|
|
GO:0005524
ATP binding
|
IEA
GO_REF:0000002 |
REMOVE |
Summary: ATP binding reviewed for HSP10: REMOVE.
Reason: Remove; ATP binding/hydrolysis belongs to Hsp60 in this system, while Hsp10 regulates the Hsp60 ATPase-driven cycle.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 regulates the Hsp60 ATPase-driven folding cycle to promote folding/assembly of a subset of imported matrix proteins
|
|
GO:0005739
mitochondrion
|
IEA
GO_REF:0000117 |
ACCEPT |
Summary: mitochondrion reviewed for HSP10: ACCEPT.
Reason: Retain as broad mitochondrial localization.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria and investigated using isolated mitochondria import/folding/sorting assays
|
|
GO:0005759
mitochondrial matrix
|
IEA
GO_REF:0000044 |
ACCEPT |
Summary: mitochondrial matrix reviewed for HSP10: ACCEPT.
Reason: Retain as the precise core location for Hsp10 action with mitochondrial Hsp60.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Dubaquie et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with hsp60 in folding of imported proteins
|
|
GO:0006457
protein folding
|
IEA
GO_REF:0000002 |
ACCEPT |
Summary: protein folding reviewed for HSP10: ACCEPT.
Reason: Retain as the principal biological process supported by Hsp10/Hsp60-dependent folding of imported mitochondrial proteins.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 acts with the mitochondrial chaperonin **Hsp60** to enable ATP-dependent folding and assembly of a subset of imported mitochondrial matrix proteins
|
|
GO:0044183
protein folding chaperone
|
IEA
GO_REF:0000002 |
ACCEPT |
Summary: protein folding chaperone reviewed for HSP10: ACCEPT.
Reason: Retain as the co-chaperonin contribution to mitochondrial protein folding. The final annotation should be interpreted with contributes_to semantics because Hsp10 gates and regulates the Hsp60 folding chamber rather than folding substrates independently.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 forms a lid to create a protected folding chamber and coordinate ATP-driven conformational transitions
|
|
GO:0005739
mitochondrion
|
HDA
PMID:24769239 Quantitative variations of the mitochondrial proteome and ph... |
ACCEPT |
Summary: mitochondrion reviewed for HSP10: ACCEPT.
Reason: Retain as broad mitochondrial localization.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria and investigated using isolated mitochondria import/folding/sorting assays
|
|
GO:0005739
mitochondrion
|
HDA
PMID:16823961 Toward the complete yeast mitochondrial proteome: multidimen... |
ACCEPT |
Summary: mitochondrion reviewed for HSP10: ACCEPT.
Reason: Retain as broad mitochondrial localization.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria and investigated using isolated mitochondria import/folding/sorting assays
|
|
GO:0045041
protein import into mitochondrial intermembrane space
|
IMP
PMID:7913473 Role of the chaperonin cofactor Hsp10 in protein folding and... |
KEEP AS NON CORE |
Summary: protein import into mitochondrial intermembrane space reviewed for HSP10: KEEP_AS_NON_CORE.
Reason: Keep as a supported substrate-specific Rieske Fe/S sorting phenotype, but note the mechanistic nuance that Hsp10 acts in the matrix folding/sorting step for a precursor en route to the intermembrane space rather than as a general IMS import receptor.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 contributes to **sorting** of certain proteins that transit the matrix en route to the intermembrane space, specifically the **Rieske Fe/S protein**
|
|
GO:0051131
chaperone-mediated protein complex assembly
|
IMP
PMID:7913473 Role of the chaperonin cofactor Hsp10 in protein folding and... |
ACCEPT |
Summary: chaperone-mediated protein complex assembly reviewed for HSP10: ACCEPT.
Reason: Retain as Hsp10 supports productive assembly/folding of imported mitochondrial proteins through the Hsp60 chamber.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 regulates the Hsp60 ATPase-driven folding cycle to promote folding/assembly of a subset of imported matrix proteins
|
|
GO:0005759
mitochondrial matrix
|
IDA
PMID:7903252 Cloning and disruption of the gene encoding yeast mitochondr... |
ACCEPT |
Summary: mitochondrial matrix reviewed for HSP10: ACCEPT.
Reason: Retain as the precise core location for Hsp10 action with mitochondrial Hsp60.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Dubaquie et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with hsp60 in folding of imported proteins
|
|
GO:0006457
protein folding
|
IDA
PMID:7902576 Identification and functional analysis of chaperonin 10, the... |
ACCEPT |
Summary: protein folding reviewed for HSP10: ACCEPT.
Reason: Retain as the principal biological process supported by Hsp10/Hsp60-dependent folding of imported mitochondrial proteins.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 acts with the mitochondrial chaperonin **Hsp60** to enable ATP-dependent folding and assembly of a subset of imported mitochondrial matrix proteins
|
|
GO:0042026
protein refolding
|
IDA
PMID:9256426 Significance of chaperonin 10-mediated inhibition of ATP hyd... |
ACCEPT |
Summary: protein refolding reviewed for HSP10: ACCEPT.
Reason: Retain based on purified Hsp60/Hsp10 refolding assays and mitochondrial substrate-folding experiments.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
In refolding of denatured mitochondrial malate dehydrogenase, hsp60 plus WT hsp10 yields about **40%** refolding
|
|
GO:0042026
protein refolding
|
IMP
PMID:9256426 Significance of chaperonin 10-mediated inhibition of ATP hyd... |
ACCEPT |
Summary: protein refolding reviewed for HSP10: ACCEPT.
Reason: Retain based on purified Hsp60/Hsp10 refolding assays and mitochondrial substrate-folding experiments.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
In refolding of denatured mitochondrial malate dehydrogenase, hsp60 plus WT hsp10 yields about **40%** refolding
|
|
GO:0051082
unfolded protein binding
|
IDA
PMID:7902576 Identification and functional analysis of chaperonin 10, the... |
MODIFY |
Summary: unfolded protein binding reviewed for HSP10: MODIFY.
Reason: Hsp10 primarily binds the Hsp60 chaperonin lid interface rather than generic unfolded substrates; protein-folding chaperone binding is more accurate.
Proposed replacements:
protein-folding chaperone binding
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Hsp10 primarily binds the Hsp60 chaperonin lid interface rather than generic unfolded substrates
|
|
GO:0051087
protein-folding chaperone binding
|
IPI
PMID:9256426 Significance of chaperonin 10-mediated inhibition of ATP hyd... |
ACCEPT |
Summary: protein-folding chaperone binding reviewed for HSP10: ACCEPT.
Reason: Retain because Hsp10 physically and functionally binds the protein-folding chaperone Hsp60.
Supporting Evidence:
file:yeast/HSP10/HSP10-deep-research-falcon.md
Binding affinity in the ADP state includes one hsp10 binding event with apparent **Kd ~0.88-0.9 nM**
|
Q: Which imported mitochondrial proteins are most dependent on Hsp10 versus Hsp60 alone under physiological conditions?
Q: What features make the Rieske Fe/S protein and other substrates require Hsp10 during matrix transit and onward sorting?
Experiment: Use an endogenous HSP10 degron or temperature-sensitive allele with quantitative mitochondrial import/folding proteomics to compare solubility, protease resistance, assembly, and sorting of matrix and intermembrane-space-destined substrates.
Hypothesis: Hsp10 dependence is substrate-selective and highest for imported proteins that require chamber-mediated folding or remain folding-competent during matrix transit.
Type: mitochondrial import and folding proteomics
provider: falcon
model: Edison Scientific Literature
cached: false
start_time: '2026-05-04T11:46:58.227597'
end_time: '2026-05-04T12:04:10.246016'
duration_seconds: 1032.02
template_file: templates/gene_research_go_focused.md
template_variables:
organism: yeast
gene_id: HSP10
gene_symbol: HSP10
uniprot_accession: P38910
protein_description: 'RecName: Full=10 kDa heat shock protein, mitochondrial; Short=HSP10;
AltName: Full=10 kDa chaperonin;'
gene_info: Name=HSP10; Synonyms=CPN10; OrderedLocusNames=YOR020C; ORFNames=OR26.10;
organism_full: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast).
protein_family: Belongs to the GroES chaperonin family. .
protein_domains: Chaperonin_GroES. (IPR020818); Chaperonin_GroES_sf. (IPR037124);
Chaprnonin_Cpn10_CS. (IPR018369); GroES-like_sf. (IPR011032); Cpn10 (PF00166)
provider_config:
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citation_count: 23
BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.
DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'HSP10' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information
Please provide a comprehensive research report on the gene HSP10 (gene ID: HSP10, UniProt: P38910) in yeast.
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.
Question: You are an expert researcher providing comprehensive, well-cited information.
Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies
Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.
BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.
DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'HSP10' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information
Please provide a comprehensive research report on the gene HSP10 (gene ID: HSP10, UniProt: P38910) in yeast.
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.
Yeast Hsp10 is a mitochondrial co-chaperonin (GroES/Cpn10 family) that acts with the mitochondrial chaperonin Hsp60 (GroEL/Cpn60 family) to enable ATP-dependent folding and assembly of a subset of imported mitochondrial matrix proteins and to support intramitochondrial sorting of selected substrates (notably the Rieske Fe/S protein) during transit through the matrix. Genetic studies show HSP10 is essential (loss requires complementation; temperature-sensitive alleles are lethal at non-permissive temperature), and biochemical work shows high-affinity nucleotide-dependent binding to Hsp60 and regulation of Hsp60 ATPase coupled to productive client folding. Substrate dependence is selective: some proteins fold largely independently of Hsp10/Hsp60, while other large enzymes (e.g., Ilv3p, aconitase homologs) strongly depend on them.
The target described by UniProt accession P38910 (10 kDa heat shock protein, mitochondrial; GroES/Cpn10 family; yeast locus YOR020C) matches the gene/protein studied in classic yeast mitochondrial folding literature as Hsp10 / hsp10 / cochaperonin GroES homologue. Höhfeld & Hartl cloned yeast HSP10 and characterized it as the mitochondrial GroES homologue/cofactor of Hsp60, using temperature-sensitive lethal hspl0 mutants and mitochondrial import assays (publication date: 1994-07; URL: https://doi.org/10.1083/jcb.126.2.305) (hohfeld1994roleofthe pages 1-2). Dubaquié et al. subsequently used yeast mitochondrial hsp10(P36H) temperature-sensitive variants in biochemical and substrate-identification experiments, consistent with the GroES mobile loop region central to GroES/Cpn10 function (publication dates: 1997-08 and 1998-10; URLs: https://doi.org/10.1073/pnas.94.17.9011 and https://doi.org/10.1093/emboj/17.20.5868) (dubaquie1997significanceofchaperonin pages 1-2, dubaquie1998identificationofin pages 4-5).
Hsp10 (also called Cpn10) is the co-chaperonin partner of Group I chaperonins. Group I chaperonins form a barrel-like chamber; the co-chaperonin forms a detachable “lid” that caps one end of the chamber to create a protected folding environment during an ATP-driven reaction cycle (singh2024molecularchaperoninhsp60 pages 2-4, boshoff2015chaperonincochaperonininteractions. pages 1-4).
A recent review (publication date: 2024-05; URL: https://doi.org/10.3390/ijms25105483) summarizes the canonical Group I cycle: Hsp60/GroEL is a double-ring complex (two heptameric rings); co-chaperonin GroES/Hsp10 caps one ring to form an asymmetric “cis” folding chamber. ATP binding and hydrolysis coordinate encapsulation, client folding, and timed release through co-chaperonin dissociation (singh2024molecularchaperoninhsp60 pages 2-4, singh2024molecularchaperoninhsp60 pages 1-2). A dedicated review chapter similarly emphasizes that GroES/Hsp10 lid binding dislodges substrate into the chamber and ATP/co-chaperonin binding enlarges the chamber to allow folding (publication date: 2015-12; URL: https://doi.org/10.1007/978-3-319-11731-7_8) (boshoff2015chaperonincochaperonininteractions. pages 1-4).
Höhfeld & Hartl generated temperature-sensitive lethal yeast hspl0 mutants and used genetic complementation logic indicating that loss of HSP10 function requires complementation for viability, supporting that HSP10 is essential under the tested conditions (hohfeld1994roleofthe pages 1-2, hohfeld1994roleofthe pages 2-3).
The yeast Hsp10 studied by Höhfeld & Hartl is a mitochondrial factor purified from mitochondria and investigated using isolated mitochondria import/folding/sorting assays, establishing its site of action in mitochondrial protein biogenesis (hohfeld1994roleofthe pages 2-3). Dubaquié et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with hsp60 in folding of imported proteins (dubaquie1998identificationofin pages 1-2, dubaquie1998identificationofin pages 5-6).
Direct biochemical evidence demonstrates that yeast hsp10 is a heptameric co-chaperonin that binds nucleotide-dependently to the 14-mer hsp60 chaperonin and regulates its ATPase in a way coupled to productive folding.
These values support a model where hsp10 modulates the ATPase cycle of hsp60 and thereby gates productive folding (dubaquie1997significanceofchaperonin pages 1-2).
Both the yeast genetics and biochemistry converge on residues ~25–40 (mobile-loop-like region) as critical for chaperonin interaction.
Figure evidence from Höhfeld & Hartl shows ATP-dependent complex formation between yeast Hsp10 and GroEL, and reduced binding of the P36>S mutant at non-permissive temperature (hohfeld1994roleofthe media 9f154887, hohfeld1994roleofthe media f10be0d9).
A key insight from Dubaquié et al. (publication date 1998-10; URL: https://doi.org/10.1093/emboj/17.20.5868) is that Hsp60 and Hsp10 requirements overlap but are not identical.
Quantitative folding and aggregation readouts include:
These data support that Hsp10 is not a universal requirement for all matrix protein maturation but is essential overall because key substrates (and/or the folding system itself, including newly imported Hsp60) depend strongly on it (dubaquie1998identificationofin pages 4-5, dubaquie1998identificationofin pages 1-2).
Höhfeld & Hartl provide in vivo/organellar evidence that Hsp10 contributes to sorting of certain proteins that transit the matrix en route to the intermembrane space, specifically the Rieske Fe/S protein. In hspl0 (P36>S) mutant mitochondria at non-permissive temperature, the Rieske Fe/S protein shows accumulation of processing intermediates and increased detergent-insoluble (aggregated) material, consistent with defective maturation/sorting (hohfeld1994roleofthe pages 8-9, hohfeld1994roleofthe pages 1-2).
Hsp10’s function is best placed within mitochondrial protein import and folding/proteostasis pathways: after nuclear-encoded precursors enter mitochondria, a subset require the Hsp60/Hsp10 chaperonin system to reach native structure or to remain competent for onward sorting steps (hohfeld1994roleofthe pages 1-2, dubaquie1998identificationofin pages 5-6, hohfeld1994roleofthe pages 8-9). Mechanistically, this maps to the conserved Group I cycle in which Hsp10 forms a lid to create a protected folding chamber and coordinate ATP-driven conformational transitions (singh2024molecularchaperoninhsp60 pages 2-4, boshoff2015chaperonincochaperonininteractions. pages 1-4).
Yeast-specific Hsp10 mechanistic experimentation is dominated by foundational 1990s work; however, recent studies refine the structural logic of the conserved mitochondrial Hsp60/Hsp10 system.
These 2024 sources support an updated mechanistic framing for yeast Hsp10 as a conserved lid/cofactor that participates in dynamic conformational cycles and possibly asymmetric client-handling strategies, consistent with yeast genetic/biochemical evidence that different substrates have different dependencies on the co-chaperonin (dubaquie1998identificationofin pages 4-5, singh2024molecularchaperoninhsp60 pages 2-4).
The yeast Hsp60/Hsp10 system provides a genetically tractable model to dissect mitochondrial protein folding, quality control, and sorting, using temperature-sensitive alleles in the conserved mobile-loop region (P36) to perturb function in vivo (hohfeld1994roleofthe pages 1-2, dubaquie1998identificationofin pages 4-5).
Although not yeast-specific, recent and current reviews emphasize that mitochondrial Hsp60/Hsp10 systems are central to proteostasis and are being explored as targets/biomarkers in diverse disease contexts (e.g., via Hsp60-directed strategies), underscoring why mechanistic insights from yeast remain relevant to broader biology (singh2024molecularchaperoninhsp60 pages 2-4).
Hsp10 (YOR020C; UniProt P38910) is an essential mitochondrial co-chaperonin that binds Hsp60 with high affinity in a nucleotide-dependent manner and regulates the Hsp60 ATPase-driven folding cycle to promote folding/assembly of a subset of imported matrix proteins and to support sorting of select substrates (e.g., Rieske Fe/S protein) during intramitochondrial trafficking. This statement is directly supported by yeast genetics and mitochondria import/sorting experiments (hohfeld1994roleofthe pages 1-2, hohfeld1994roleofthe pages 8-9) and by quantitative purified-protein binding/refolding assays (dubaquie1997significanceofchaperonin pages 1-2, dubaquie1997significanceofchaperonin pages 2-3).
Dubaquié et al. show that some proteins fold with little dependence on Hsp10/Hsp60 (e.g., y-mdh1), yet newly imported Hsp60 itself is dramatically dependent on Hsp10 (<5% protease-resistant folding in hsp10-ts), implying a systems-level fragility where co-chaperonin dysfunction can compromise folding capacity broadly, even if a subset of substrates is intrinsically independent (dubaquie1998identificationofin pages 4-5, dubaquie1998identificationofin pages 5-6).
Key experimental figures from Höhfeld & Hartl (1994) show ATP-dependent complex formation between yeast Hsp10 and GroEL, the P36-region mutation mapping to the GroES-like mobile loop, reduced binding of the mutant at non-permissive temperature, and impaired assembly of an imported matrix protein (OTC) (hohfeld1994roleofthe media 9f154887, hohfeld1994roleofthe media f10be0d9, hohfeld1994roleofthe media 887c719f).
| Study (year, journal) | Experimental system | Key finding about Hsp10 function/localization | Quantitative data (Kd, % refolding, aggregation, folding half-time, induction) | Notes (substrate specificity/phenotype) |
|---|---|---|---|---|
| Höhfeld & Hartl (1994, J Cell Biol) | S. cerevisiae HSP10 cloning; temperature-sensitive mutants; isolated mitochondria; in vitro import/folding/sorting assays | Yeast Hsp10 is the mitochondrial GroES homologue/co-chaperonin required for Hsp60-dependent folding and assembly of imported matrix proteins and for sorting of some proteins (notably Rieske Fe/S protein) passing through the matrix to the intermembrane space; ts lesions map to residues 25–40, the GroES mobile-loop-like region, consistent with direct chaperonin binding in mitochondria (hohfeld1994roleofthe pages 1-2, hohfeld1994roleofthe pages 10-11) | HSP10 expression induced ~2–3-fold at elevated temperature; complete membrane translocation of imported Su9-DHFR in ~120 s; Rieske Fe/S sorting/import assays followed for 40 min; complementation genetics showed deletion required plasmid-borne HSP10 for viability (hohfeld1994roleofthe pages 2-3, hohfeld1994roleofthe pages 8-9) | Essential gene; hsp10 ts mutants are temperature-sensitive lethal; Rieske Fe/S precursor accumulates/aggregates in mutant mitochondria at non-permissive temperature; DHFR fusion folding/import is largely Hsp10-independent, showing substrate specificity (hohfeld1994roleofthe pages 1-2, hohfeld1994roleofthe pages 8-9) |
| Dubaquié et al. (1997, PNAS) | Purified yeast mitochondrial Hsp60/Hsp10 and hsp10(P36H); in vitro binding, ATPase, oligomerization, and mMDH refolding assays | Hsp10 is a heptameric mitochondrial co-chaperonin that binds Hsp60 in a nucleotide-dependent manner and promotes ATP-dependent substrate folding; inhibition of Hsp60 ATPase is mechanistically linked to folding activity; P36H weakens binding and impairs function with the physiological partner Hsp60 (dubaquie1997significanceofchaperonin pages 1-2, dubaquie1997significanceofchaperonin pages 2-3) | Apparent ADP-state binding: first Hsp10 to Hsp60 Kd ~0.88–0.9 nM; second binding event Kd ~24 nM; Hsp10 inhibits Hsp60 ATPase by ~40%; maximal mMDH refolding with WT Hsp10/Hsp60 ~40% after 150 min at 2–5-fold molar excess of Hsp10 over Hsp60; hsp10(P36H) gives ~30% at 25°C and <10% at 30°C; spontaneous refolding <10% at 25°C and <3% at 30°C; mutant Kd with Hsp60 ~19.2 ± 1.6 nM; GroEL+hsp10(P36H) refolding ~60% at 30°C (dubaquie1997significanceofchaperonin pages 1-2, dubaquie1997significanceofchaperonin pages 2-3) | P36H is the key ts mutation in the mobile-loop region; mutant assembles as a heptamer and is thermally stable but fails to inhibit Hsp60 ATPase effectively and shows partner-specific loss of function, supporting direct Hsp10–Hsp60 mechanistic coupling (dubaquie1997significanceofchaperonin pages 1-2, dubaquie1997significanceofchaperonin pages 2-3) |
| Dubaquié et al. (1998, EMBO J) | Temperature-sensitive hsp10-ts (P36H) and hsp60-ts yeast strains; isolated mitochondria; homologous import/folding/aggregation assays; 2D gel analysis of imported proteins | Hsp10 acts in the mitochondrial matrix with Hsp60 but substrate requirements overlap only partially: some proteins need both Hsp60 and Hsp10, some depend mainly on Hsp60, and some fold largely independently; Hsp10 contributes substrate specificity and is especially important for folding of newly imported Hsp60 itself (dubaquie1998identificationofin pages 6-7, dubaquie1998identificationofin pages 1-2, dubaquie1998identificationofin pages 5-6) | Import efficiency in homologous assay ~5–10% of radiolabeled proteins; after 30 min, >80% of newly imported Hsp60 became protease-resistant in WT mitochondria vs ~20% in hsp60-ts and <5% in hsp10-ts; detergent-insoluble pellet fractions: ILV3 100% (hsp60-ts), 50% (hsp10-ts); IDH1 95%, <5%; ACO1 100%, 80%; MDH1 <20%, <5%; y-rhodanese folding half-time ~4 min (vs 15 min for bovine rhodanese); y-Mdh1 reaches protease-resistant state in ~70–90% of imported molecules irrespective of hsp10/hsp60 status; hsp60 used at 35.7 nM oligomer in assays; >90% of total Hsp60 was detergent-insoluble in hsp60-ts after heat inactivation (dubaquie1998identificationofin pages 6-7, dubaquie1998identificationofin pages 1-2, dubaquie1998identificationofin pages 5-6, dubaquie1998identificationofin pages 4-5) | Protein import into matrix remains largely unaffected in hsp10-ts, so defects reflect folding rather than import failure; large substrates such as Ilv3p (63 kDa) and aconitases Aco1p/AcoXp (83–87 kDa) are most sensitive, whereas y-rhodanese and y-Mdh1 show little or no Hsp10 dependence, demonstrating marked substrate specificity (dubaquie1998identificationofin pages 6-7, dubaquie1998identificationofin pages 1-2, dubaquie1998identificationofin pages 5-6, dubaquie1998identificationofin pages 4-5) |
Table: This table summarizes primary-study evidence for the function of Saccharomyces cerevisiae mitochondrial Hsp10/YOR020C, including localization, mechanistic role with Hsp60, essentiality, and quantitative measurements from classic genetic and biochemical experiments.
Direct citations to UniProt or SGD web entries for P38910/YOR020C could not be ingested as citable sources with the available tools in this run; consequently, database-derived claims (e.g., specific GO terms, systematic name cross-references) were not used as primary evidence. The central functional, localization, and mechanistic assertions are instead grounded in peer-reviewed yeast primary literature and complemented by recent (2024) chaperonin reviews/structural work (hohfeld1994roleofthe pages 1-2, dubaquie1997significanceofchaperonin pages 2-3, dubaquie1998identificationofin pages 4-5, singh2024molecularchaperoninhsp60 pages 2-4).
References
(hohfeld1994roleofthe pages 1-2): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(dubaquie1997significanceofchaperonin pages 1-2): Yves Dubaquié, Renate Looser, and Sabine Rospert. Significance of chaperonin 10-mediated inhibition of atp hydrolysis by chaperonin 60. Proceedings of the National Academy of Sciences of the United States of America, 94 17:9011-6, Aug 1997. URL: https://doi.org/10.1073/pnas.94.17.9011, doi:10.1073/pnas.94.17.9011. This article has 49 citations and is from a highest quality peer-reviewed journal.
(dubaquie1998identificationofin pages 4-5): Y. Dubaquié, R. Looser, U. Fünfschilling, P. Jenö, and S. Rospert. Identification of in vivo substrates of the yeast mitochondrial chaperonins reveals overlapping but non‐identical requirement for hsp60 and hsp10. The EMBO Journal, 17:5868-5876, Oct 1998. URL: https://doi.org/10.1093/emboj/17.20.5868, doi:10.1093/emboj/17.20.5868. This article has 130 citations.
(singh2024molecularchaperoninhsp60 pages 2-4): Manish Kumar Singh, Yoonhwa Shin, Sunhee Han, Joohun Ha, Pramod K. Tiwari, Sung Soo Kim, and Insug Kang. Molecular chaperonin hsp60: current understanding and future prospects. International Journal of Molecular Sciences, 25:5483, May 2024. URL: https://doi.org/10.3390/ijms25105483, doi:10.3390/ijms25105483. This article has 86 citations.
(boshoff2015chaperonincochaperonininteractions. pages 1-4): Aileen Boshoff. Chaperonin-co-chaperonin interactions. Sub-cellular biochemistry, 78:153-78, Dec 2015. URL: https://doi.org/10.1007/978-3-319-11731-7_8, doi:10.1007/978-3-319-11731-7_8. This article has 19 citations.
(singh2024molecularchaperoninhsp60 pages 1-2): Manish Kumar Singh, Yoonhwa Shin, Sunhee Han, Joohun Ha, Pramod K. Tiwari, Sung Soo Kim, and Insug Kang. Molecular chaperonin hsp60: current understanding and future prospects. International Journal of Molecular Sciences, 25:5483, May 2024. URL: https://doi.org/10.3390/ijms25105483, doi:10.3390/ijms25105483. This article has 86 citations.
(hohfeld1994roleofthe pages 2-3): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(dubaquie1998identificationofin pages 1-2): Y. Dubaquié, R. Looser, U. Fünfschilling, P. Jenö, and S. Rospert. Identification of in vivo substrates of the yeast mitochondrial chaperonins reveals overlapping but non‐identical requirement for hsp60 and hsp10. The EMBO Journal, 17:5868-5876, Oct 1998. URL: https://doi.org/10.1093/emboj/17.20.5868, doi:10.1093/emboj/17.20.5868. This article has 130 citations.
(dubaquie1998identificationofin pages 5-6): Y. Dubaquié, R. Looser, U. Fünfschilling, P. Jenö, and S. Rospert. Identification of in vivo substrates of the yeast mitochondrial chaperonins reveals overlapping but non‐identical requirement for hsp60 and hsp10. The EMBO Journal, 17:5868-5876, Oct 1998. URL: https://doi.org/10.1093/emboj/17.20.5868, doi:10.1093/emboj/17.20.5868. This article has 130 citations.
(dubaquie1997significanceofchaperonin pages 2-3): Yves Dubaquié, Renate Looser, and Sabine Rospert. Significance of chaperonin 10-mediated inhibition of atp hydrolysis by chaperonin 60. Proceedings of the National Academy of Sciences of the United States of America, 94 17:9011-6, Aug 1997. URL: https://doi.org/10.1073/pnas.94.17.9011, doi:10.1073/pnas.94.17.9011. This article has 49 citations and is from a highest quality peer-reviewed journal.
(hohfeld1994roleofthe pages 10-11): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(hohfeld1994roleofthe media 9f154887): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(hohfeld1994roleofthe media f10be0d9): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(hohfeld1994roleofthe pages 8-9): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(tascon2025structuralbasisfor pages 8-11): Igor Tascón, Jorge P. López-Alonso, Yoel Shkolnisky, David Gil-Cartón, Jesús Vilchez-Garcia, Alberto G. Berruezo, Yacob Gómez-Llorente, Radhika Malik, Fady Jebara, Malay Patra, Joel A. Hirsch, Abdussalam Azem, and Iban Ubarretxena-Belandia. Structural basis for atp-driven double-ring assembly of the human mitochondrial hsp60 chaperonin. BioRxiv, Oct 2025. URL: https://doi.org/10.1101/2025.10.04.680452, doi:10.1101/2025.10.04.680452. This article has 2 citations.
(hohfeld1994roleofthe media 887c719f): J Höhfeld and F U Hartl. Role of the chaperonin cofactor hsp10 in protein folding and sorting in yeast mitochondria. The Journal of cell biology, 126:305-315, Jul 1994. URL: https://doi.org/10.1083/jcb.126.2.305, doi:10.1083/jcb.126.2.305. This article has 169 citations.
(dubaquie1998identificationofin pages 6-7): Y. Dubaquié, R. Looser, U. Fünfschilling, P. Jenö, and S. Rospert. Identification of in vivo substrates of the yeast mitochondrial chaperonins reveals overlapping but non‐identical requirement for hsp60 and hsp10. The EMBO Journal, 17:5868-5876, Oct 1998. URL: https://doi.org/10.1093/emboj/17.20.5868, doi:10.1093/emboj/17.20.5868. This article has 130 citations.
id: P38910
gene_symbol: HSP10
product_type: PROTEIN
status: COMPLETE
taxon:
id: NCBITaxon:559292
label: Saccharomyces cerevisiae
description: 'HSP10 encodes the essential mitochondrial matrix GroES/Cpn10 co-chaperonin that binds Hsp60, regulates the Hsp60
ATPase-driven folding chamber, promotes folding and assembly of imported matrix proteins, and supports sorting of selected
proteins such as the Rieske Fe/S protein.'
existing_annotations:
- term:
id: GO:0006457
label: protein folding
evidence_type: IBA
original_reference_id: GO_REF:0000033
review:
summary: 'protein folding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the principal biological process supported by Hsp10/Hsp60-dependent folding of imported
mitochondrial proteins.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 acts with the mitochondrial chaperonin **Hsp60** to enable ATP-dependent folding and assembly
of a subset of imported mitochondrial matrix proteins
- term:
id: GO:0005739
label: mitochondrion
evidence_type: IBA
original_reference_id: GO_REF:0000033
review:
summary: 'mitochondrion reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as broad mitochondrial localization.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria
and investigated using isolated mitochondria import/folding/sorting assays
- term:
id: GO:0005759
label: mitochondrial matrix
evidence_type: IBA
original_reference_id: GO_REF:0000033
review:
summary: 'mitochondrial matrix reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the precise core location for Hsp10 action with mitochondrial Hsp60.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Dubaquie et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with
hsp60 in folding of imported proteins
- term:
id: GO:0051087
label: protein-folding chaperone binding
evidence_type: IBA
original_reference_id: GO_REF:0000033
review:
summary: 'protein-folding chaperone binding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain because Hsp10 physically and functionally binds the protein-folding chaperone Hsp60.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: yeast hsp10 is a heptameric co-chaperonin that binds nucleotide-dependently to the 14-mer hsp60
chaperonin
- term:
id: GO:0046872
label: metal ion binding
evidence_type: IBA
original_reference_id: GO_REF:0000033
review:
summary: 'metal ion binding reviewed for HSP10: REMOVE.'
action: REMOVE
reason: Remove; no reviewed yeast Hsp10 evidence supports independent metal-ion binding as part of its GroES-like
co-chaperonin function.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 is the **co-chaperonin** partner of Group I chaperonins
- term:
id: GO:0051082
label: unfolded protein binding
evidence_type: IBA
original_reference_id: GO_REF:0000033
review:
summary: 'unfolded protein binding reviewed for HSP10: MODIFY.'
action: MODIFY
reason: Hsp10 primarily binds the Hsp60 chaperonin lid interface rather than generic unfolded substrates;
protein-folding chaperone binding is more accurate.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: yeast hsp10 is a heptameric co-chaperonin that binds nucleotide-dependently to the 14-mer hsp60
chaperonin
proposed_replacement_terms:
- id: GO:0051087
label: protein-folding chaperone binding
- term:
id: GO:0005524
label: ATP binding
evidence_type: IEA
original_reference_id: GO_REF:0000002
review:
summary: 'ATP binding reviewed for HSP10: REMOVE.'
action: REMOVE
reason: Remove; ATP binding/hydrolysis belongs to Hsp60 in this system, while Hsp10 regulates the Hsp60
ATPase-driven cycle.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 regulates the Hsp60 ATPase-driven folding cycle to promote folding/assembly of a subset of
imported matrix proteins
- term:
id: GO:0005739
label: mitochondrion
evidence_type: IEA
original_reference_id: GO_REF:0000117
review:
summary: 'mitochondrion reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as broad mitochondrial localization.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria
and investigated using isolated mitochondria import/folding/sorting assays
- term:
id: GO:0005759
label: mitochondrial matrix
evidence_type: IEA
original_reference_id: GO_REF:0000044
review:
summary: 'mitochondrial matrix reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the precise core location for Hsp10 action with mitochondrial Hsp60.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Dubaquie et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with
hsp60 in folding of imported proteins
- term:
id: GO:0006457
label: protein folding
evidence_type: IEA
original_reference_id: GO_REF:0000002
review:
summary: 'protein folding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the principal biological process supported by Hsp10/Hsp60-dependent folding of imported
mitochondrial proteins.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 acts with the mitochondrial chaperonin **Hsp60** to enable ATP-dependent folding and assembly
of a subset of imported mitochondrial matrix proteins
- term:
id: GO:0044183
label: protein folding chaperone
evidence_type: IEA
original_reference_id: GO_REF:0000002
review:
summary: 'protein folding chaperone reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the co-chaperonin contribution to mitochondrial protein folding. The final annotation should be interpreted with contributes_to semantics because Hsp10 gates and regulates the Hsp60 folding chamber rather than folding substrates independently.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 forms a lid to create a protected folding chamber and coordinate ATP-driven conformational
transitions
- term:
id: GO:0005739
label: mitochondrion
evidence_type: HDA
original_reference_id: PMID:24769239
review:
summary: 'mitochondrion reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as broad mitochondrial localization.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria
and investigated using isolated mitochondria import/folding/sorting assays
- term:
id: GO:0005739
label: mitochondrion
evidence_type: HDA
original_reference_id: PMID:16823961
review:
summary: 'mitochondrion reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as broad mitochondrial localization.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: The yeast Hsp10 studied by Hohfeld & Hartl is a **mitochondrial** factor purified from mitochondria
and investigated using isolated mitochondria import/folding/sorting assays
- term:
id: GO:0045041
label: protein import into mitochondrial intermembrane space
evidence_type: IMP
original_reference_id: PMID:7913473
review:
summary: 'protein import into mitochondrial intermembrane space reviewed for HSP10: KEEP_AS_NON_CORE.'
action: KEEP_AS_NON_CORE
reason: Keep as a supported substrate-specific Rieske Fe/S sorting phenotype, but note the mechanistic nuance that
Hsp10 acts in the matrix folding/sorting step for a precursor en route to the intermembrane space rather than as a
general IMS import receptor.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 contributes to **sorting** of certain proteins that transit the matrix en route to the
intermembrane space, specifically the **Rieske Fe/S protein**
- term:
id: GO:0051131
label: chaperone-mediated protein complex assembly
evidence_type: IMP
original_reference_id: PMID:7913473
review:
summary: 'chaperone-mediated protein complex assembly reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as Hsp10 supports productive assembly/folding of imported mitochondrial proteins through the Hsp60
chamber.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 regulates the Hsp60 ATPase-driven folding cycle to promote folding/assembly of a subset of
imported matrix proteins
- term:
id: GO:0005759
label: mitochondrial matrix
evidence_type: IDA
original_reference_id: PMID:7903252
review:
summary: 'mitochondrial matrix reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the precise core location for Hsp10 action with mitochondrial Hsp60.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Dubaquie et al. explicitly frame yeast hsp10 as a mitochondrial (matrix) co-chaperonin acting with
hsp60 in folding of imported proteins
- term:
id: GO:0006457
label: protein folding
evidence_type: IDA
original_reference_id: PMID:7902576
review:
summary: 'protein folding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain as the principal biological process supported by Hsp10/Hsp60-dependent folding of imported
mitochondrial proteins.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 acts with the mitochondrial chaperonin **Hsp60** to enable ATP-dependent folding and assembly
of a subset of imported mitochondrial matrix proteins
- term:
id: GO:0042026
label: protein refolding
evidence_type: IDA
original_reference_id: PMID:9256426
review:
summary: 'protein refolding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain based on purified Hsp60/Hsp10 refolding assays and mitochondrial substrate-folding experiments.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: In refolding of denatured mitochondrial malate dehydrogenase, hsp60 plus WT hsp10 yields about
**40%** refolding
- term:
id: GO:0042026
label: protein refolding
evidence_type: IMP
original_reference_id: PMID:9256426
review:
summary: 'protein refolding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain based on purified Hsp60/Hsp10 refolding assays and mitochondrial substrate-folding experiments.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: In refolding of denatured mitochondrial malate dehydrogenase, hsp60 plus WT hsp10 yields about
**40%** refolding
- term:
id: GO:0051082
label: unfolded protein binding
evidence_type: IDA
original_reference_id: PMID:7902576
review:
summary: 'unfolded protein binding reviewed for HSP10: MODIFY.'
action: MODIFY
reason: Hsp10 primarily binds the Hsp60 chaperonin lid interface rather than generic unfolded substrates;
protein-folding chaperone binding is more accurate.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 primarily binds the Hsp60 chaperonin lid interface rather than generic unfolded substrates
proposed_replacement_terms:
- id: GO:0051087
label: protein-folding chaperone binding
- term:
id: GO:0051087
label: protein-folding chaperone binding
evidence_type: IPI
original_reference_id: PMID:9256426
review:
summary: 'protein-folding chaperone binding reviewed for HSP10: ACCEPT.'
action: ACCEPT
reason: Retain because Hsp10 physically and functionally binds the protein-folding chaperone Hsp60.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Binding affinity in the ADP state includes one hsp10 binding event with apparent **Kd ~0.88-0.9 nM**
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: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:0000117
title: Electronic Gene Ontology annotations created by ARBA machine learning models
findings: []
- id: PMID:16823961
title: 'Toward the complete yeast mitochondrial proteome: multidimensional separation techniques for mitochondrial proteomics.'
findings: []
- id: PMID:24769239
title: Quantitative variations of the mitochondrial proteome and phosphoproteome during fermentative and respiratory
growth in Saccharomyces cerevisiae.
findings: []
- id: PMID:7902576
title: Identification and functional analysis of chaperonin 10, the groES homolog from yeast mitochondria.
findings: []
- id: PMID:7903252
title: Cloning and disruption of the gene encoding yeast mitochondrial chaperonin 10, the homolog of E. coli groES.
findings: []
- id: PMID:7913473
title: Role of the chaperonin cofactor Hsp10 in protein folding and sorting in yeast mitochondria.
findings: []
- id: PMID:9256426
title: Significance of chaperonin 10-mediated inhibition of ATP hydrolysis by chaperonin 60.
findings: []
- id: file:yeast/HSP10/HSP10-deep-research-falcon.md
title: Falcon deep research report for yeast HSP10
findings: []
- id: file:interpro/panther/PTHR10772/PTHR10772-metadata.yaml
title: PANTHER family PTHR10772, 10 kDa heat shock protein
findings: []
core_functions:
- description: Hsp10 is a mitochondrial matrix co-chaperonin that binds Hsp60 and gates the Hsp60 folding chamber,
supporting folding/refolding and assembly of selected imported mitochondrial proteins.
supported_by:
- reference_id: file:yeast/HSP10/HSP10-deep-research-falcon.md
supporting_text: Hsp10 binds Hsp60 with high affinity in a nucleotide-dependent manner and regulates the Hsp60
ATPase-driven folding cycle
molecular_function:
id: GO:0051087
label: protein-folding chaperone binding
contributes_to_molecular_function:
id: GO:0044183
label: protein folding chaperone
directly_involved_in:
- id: GO:0006457
label: protein folding
- id: GO:0042026
label: protein refolding
- id: GO:0051131
label: chaperone-mediated protein complex assembly
locations:
- id: GO:0005759
label: mitochondrial matrix
proposed_new_terms: []
suggested_questions:
- question: Which imported mitochondrial proteins are most dependent on Hsp10 versus Hsp60 alone under physiological
conditions?
experts: []
- question: What features make the Rieske Fe/S protein and other substrates require Hsp10 during matrix transit and
onward sorting?
experts: []
suggested_experiments:
- hypothesis: Hsp10 dependence is substrate-selective and highest for imported proteins that require chamber-mediated
folding or remain folding-competent during matrix transit.
description: Use an endogenous HSP10 degron or temperature-sensitive allele with quantitative mitochondrial
import/folding proteomics to compare solubility, protease resistance, assembly, and sorting of matrix and
intermembrane-space-destined substrates.
experiment_type: mitochondrial import and folding proteomics