Abstract
The Hsp90 molecular chaperone is required for the function of hundreds of different cellular proteins. Hsp90 and a cohort of interacting proteins called cochaperones interact with clients in an ATP-dependent cycle. Cochaperone functions include targeting clients to Hsp90, regulating Hsp90 ATPase activity, and/or promoting Hsp90 conformational changes as it progresses through the cycle. Over the last 20 years, the list of cochaperones identified in human cells has grown from the initial six identified in complex with steroid hormone receptors and protein kinases to about fifty different cochaperones found in Hsp90-client complexes. These cochaperones may be placed into three groups based on shared Hsp90 interaction domains. Available evidence indicates that cochaperones vary in client specificity, abundance, and tissue distribution. Many of the cochaperones have critical roles in regulation of cancer and neurodegeneration. A more limited set of cochaperones have cellular functions that may be limited to tissues such as muscle and testis. It is likely that a small set of cochaperones are part of the core Hsp90 machinery required for the folding of a wide range of clients. The presence of more selective cochaperones may allow greater control of Hsp90 activities across different tissues or during development.
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References
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Acknowledgments
The Genotype-Tissue Expression (GTEx) Project was supported by the Common Fund of the Office of the Director of the National Institutes of Health, and by NCI, NHGRI, NHLBI, NIDA, NIMH, and NINDS. The data used for the analyses described in this manuscript were obtained from the GTEx Portal on 04/13/20. Additional information about proteins that interact with Hsp90 is available at http://www.picard.ch/downloads/Hsp90facts.pdf.
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Research in the Johnson Lab is supported by the National Institute of General Medical Sciences of the National Institutes of Health under Award Number R01GM127675. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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MED helped gather data and assisted with manuscript preparation. JLJ conceived the idea for the publication and wrote the manuscript.
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Dean, M.E., Johnson, J.L. Human Hsp90 cochaperones: perspectives on tissue-specific expression and identification of cochaperones with similar in vivo functions. Cell Stress and Chaperones 26, 3–13 (2021). https://doi.org/10.1007/s12192-020-01167-0
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DOI: https://doi.org/10.1007/s12192-020-01167-0