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Plasticity of the Hsp90 chaperone machine in divergent eukaryotic organisms

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Cell Stress and Chaperones Aims and scope

Abstract

Hsp90 is critical for the regulation and activation of numerous client proteins critical for diverse functions such as cell growth, differentiation, and reproduction. Cytosolic Hsp90 function is dependent on a battery of co-chaperone proteins that regulate the ATPase activity of Hsp90 function or direct Hsp90 to interact with specific client proteins. Little is known about how Hsp90 complexes vary between different organisms and how this affects the scope of clients that are activated by Hsp90. This study determined whether ten distinct Hsp90 co-chaperones were encoded by genes in 19 disparate eukaryotic organisms. Surprisingly, none of the co-chaperones were present in all organisms. The co-chaperone Hop/Sti1 was most widely dispersed (18 out of 19 species), while orthologs of Cdc37, which is critical for the stability and activation of diverse protein kinases in yeast and mammals, were identified in only nine out of 19 species examined. The organism with the smallest proteome, Encephalitozoon cuniculi, contained only three of these co-chaperones, suggesting a correlation between client diversity and the complexity of the Hsp90 co-chaperone machine. Our results suggest co-chaperones are critical for cytosolic Hsp90 function in vivo, but that the composition of Hsp90 complexes varies depending on the specialized protein folding requirements of divergent species.

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Abbreviations

Hsp:

heat shock protein

TPR:

tetratricopeptide repeat

BLAST:

basic local alignment search tool

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Acknowledgements

We thank David Smith, Doug Cole, and Gustavo Arrizabalaga for helpful advice and careful reading of this manuscript. This project was funded in part by the U.S. Department of Agriculture HATCH/CREES IDA01266. This publication was made possible by Grant P20 RR15587 from the National Center for Research Resources (NCRR), a component of the National Institutes of Health (NIH). Its contents are solely the responsibility of the authors and do not necessarily represent the official views of NCRR or NIH.

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Correspondence to Jill L. Johnson.

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Johnson, J.L., Brown, C. Plasticity of the Hsp90 chaperone machine in divergent eukaryotic organisms. Cell Stress and Chaperones 14, 83–94 (2009). https://doi.org/10.1007/s12192-008-0058-9

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  • DOI: https://doi.org/10.1007/s12192-008-0058-9

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