The DOI matches its Crossref record; 12 of the 12 references it cites were found in a registry or an index.
The Co-chaperone p23 Arrests the Hsp90 ATPase Cycle to Trap Client Proteins
Abstract
The action of the molecular chaperone Hsp90 is essential for the activation and assembly of an increasing number of client proteins. This function of Hsp90 has been proposed to be governed by conformational changes driven by ATP binding and hydrolysis. Association of co-chaperones and client proteins regulate the ATPase activity of Hsp90. Here, we have examined the inhibition of the ATPase activity of human Hsp90beta by one such co-chaperone, human p23. We demonstrate that human p23 interacts with Hsp90 in both the absence and presence of nucleotide with a higher affinity in the presence of the ATP analogue AMP-PNP. This is consistent with an analysis of the effect of p23 on the steady-state kinetics that revealed a mixed mechanism of inhibition. Mass spectrometry of the intact Hsp90.p23 complex determined the stoichiometry of binding to be one p23 to each subunit of the Hsp90 dimer. p23 was also shown to interact with a monomeric, truncated fragment of Hsp90, lacking the C-terminal homodimerisation domain, indicating dimerisation of Hsp90 is not a prerequisite for association with p23. Complex formation between Hsp90 and p23 increased the apparent affinity of Hsp90 for AMP-PNP and completely inhibited the ATPase activity. We propose a model where the role of p23 is to lock individual subunits of Hsp90 in an ATP-dependent conformational state that has a high affinity for client proteins.
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“because the cochaperone p23 binds directly to the ATP form of Hsp90, and this stabilizes Hsp90-client protein interactions (1, 14, 15).”
From FKBP51 Promotes Assembly of the Hsp90 Chaperone Complex and Regulates Androgen Receptor Signaling in Prostate Cancer Cells (2010) · cites this paper as [14]
In the citing paper
“Through selective binding to the ATP form of Hsp90, p23 stabilizes the 'closed' state and promotes Hsp90 interactions with client proteins (14, 33).”
From FKBP51 Promotes Assembly of the Hsp90 Chaperone Complex and Regulates Androgen Receptor Signaling in Prostate Cancer Cells (2010) · cites this paper as [14]
In the citing paper
“a cochaperone known to stabilize Hsp90 binding to client proteins (14)”
From FKBP51 Promotes Assembly of the Hsp90 Chaperone Complex and Regulates Androgen Receptor Signaling in Prostate Cancer Cells (2010) · cites this paper as [14]
Citations
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Co-chaperone regulation of conformational switching in the Hsp90 ATPase cycle
Siligardi, G., Hu, B., Panaretou, B., Piper, P. W., Pearl, L. H., & Prodromou, C. (2004) · Journal of Biological Chemistry · doi:10.1074/jbc.m410562200 · Cited by 207 · cited 6×
“In sharp contrast to human p23, Sba1 inhibits the ATPase activity of yeast Hsp90 only partially.(33,34) The level of sequence identity is 27% in the globular cores of human and yeast p23 compared to 64% identity for the respective Hsp90 homologues.”
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“Opposing a role in assisting the assembly process, p23 may alter the transcriptional activity of nuclear receptors by affecting the dissociation rate of the receptor–DNA response element complex.(28) The molecular mechanism by which p23 acts as a co-chaperone for Hsp90 is unknown.”
BackgroundRichter, K., Walter, S., & Buchner, J. (2004) · Journal of Molecular Biology · doi:10.1016/j.jmb.2004.07.064 · Cited by 159 · cited 12×
“In sharp contrast to human p23, Sba1 inhibits the ATPase activity of yeast Hsp90 only partially.(33,34) The level of sequence identity is 27% in the globular cores of human and yeast p23 compared to 64% identity for the respective Hsp90 homologues.”
BackgroundMethodResultInfluentialCrystal Structure and Activity of Human p23, a Heat Shock Protein 90 Co-chaperone
Weaver, A. J., Sullivan, W. P., Felts, S. J., Owen, B. A. L., & Toft, D. O. (2000) · Journal of Biological Chemistry · doi:10.1074/jbc.m003410200 · Cited by 136
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The Influence of ATP and p23 on the Conformation of hsp90
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“ent dimeric molecular mass calculated from sizeexclusion chromatography is most likely due to the unstructured C-terminal acidic tail of p23 increasing the apparent diameter of p23.(41) This would give rise to an aberrant elution profile during sizeexclusion chromatography, as observed.”
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Taipale, M., Jarosz, D. F., & Lindquist, S. (2010) · Nature Reviews Molecular Cell Biology · doi:10.1038/nrm2918 · Cited by 1,818
“This high degree of conformational flexibility could certainly be regulated in cells by the interaction with clients and co-chaperone”
BackgroundStructure, Function, and Regulation of the Hsp90 MachineryPreprint
Biebl, M. M., & Büchner, J. (2019) · Cold Spring Harbor Perspectives in Biology · doi:10.1101/cshperspect.a034017 · Cited by 315
“The general model of the Hsp90 ATPase cycle is applicable to all Hsp90 paralogs and isoforms.”
BackgroundInfluentialThe Hsp90 chaperone machinery: Conformational dynamics and regulation by co-chaperones
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Self-citation
Metadata
- Authors
- McLaughlin, S. H., Sobott, F., Yao, Z.-P., Zhang, W., Nielsen, P. R., Grossmann, J. G., Laue, E. D., Robinson, C. V., & Jackson, S. E.
- Affiliations
- University of Cambridge (GB)
- Daresbury Laboratory (GB)
- Corresponding author
- McLaughlin, Stephen H.
- Jackson, Sophie E.
- ORCID
- Venue
- Journal of Molecular Biology
- Publisher
- Elsevier BV
- Published
- 2006-02
- Volume
- 356
- Issue
- 3
- Pages
- 746-758
- ISSN
- 0022-2836 (ISSN-L)
- OpenAlex
- W2070981149
- Cited by
- 196
- References
- 57
- Citations by year
- 2026: 5 · 2025: 6 · 2024: 2 · 2023: 5 · 2022: 7 · 2021: 8 · 2020: 7 · 2019: 3 · 2018: 10 · 2017: 14 · 2016: 11 · 2015: 9 · 2014: 14 · 2013: 14 · 2012: 15
- FWCI
- 3.15
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Journal of Molecular Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Leverhulme Trust
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Keywords
- HSP90, p23, co-chaperones, ATPase activity, HSP90β, AMP-PNP, mixed-type inhibition, protein-protein interaction, ATP binding, chaperone mechanism
- MeSH terms
- Adenosine Triphosphatases, Adenylyl Imidodiphosphate, Calorimetry, Chromatography, Gel, DNA-Binding Proteins, Humans, Kinetics, Protein Binding, Protein Conformation, Thermodynamics, Molecular Chaperones, HSP90 Heat-Shock Proteins, Dimerization, Protein Subunits
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