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Published on: January 30, 2018
Hsp90's secrets unfold: new insights from structural and functional studies
1Dept of Cell Biology and Anatomy, Mount Sinai School of Medicine, New York, NY 10029, USA. acaplan@smtplink.mssm.edu
Trends in Cell Biology
|June 17, 1999
Summary
Heat shock protein 90 (Hsp90) is crucial for folding signal-transducing proteins and has a structure that binds and hydrolyzes ATP. Recent studies reveal its subcomplexes and co-chaperones involved in protein folding pathways.
Area of Science:
- Molecular biology
- Biochemistry
- Cellular biology
Background:
- Heat shock protein 90 (Hsp90) acts as a molecular chaperone.
- It is essential for the proper folding of signal-transducing proteins, including steroid hormone receptors and protein kinases.
- Hsp90's role extends to regulating the activity of proteins like heat-shock factor.
Purpose of the Study:
- To review recent advancements in understanding Hsp90 structure.
- To explore the functional mechanisms of Hsp90, including ATP binding and hydrolysis.
- To detail the composition and roles of Hsp90 subcomplexes and their co-chaperones.
Main Methods:
- Structural biology techniques to elucidate Hsp90 conformation.
- Biochemical assays to study ATP binding and hydrolysis.
- Co-immunoprecipitation and other methods to identify Hsp90-associated co-chaperones.
Main Results:
- Detailed structural insights into Hsp90's conformational states.
- Demonstration of ATP binding and hydrolysis as key functional activities.
- Identification of diverse Hsp90-containing subcomplexes with specific co-chaperones.
- Confirmation of Hsp90's non-essential role in nascent chain folding but critical role in other protein activities.
Conclusions:
- Hsp90's structure and ATP-hydrolyzing activity are central to its chaperone function.
- Hsp90 functions through dynamic subcomplexes involving various co-chaperones.
- Hsp90 is indispensable for the activity of numerous client proteins, impacting cellular signaling and stress responses.
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