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Characterization of Celastrol to Inhibit Hsp90 and Cdc37 Interaction

Open access
Zhang, Tao, Li, Yanyan, Yu, Yanke, Zou, Peng, Jiang, Yiqun, Sun, Duxin·2009·Journal of Biological Chemistry

Abstract

The molecular chaperone heat shock protein 90 (Hsp90) is required for the stabilization and conformational maturation of various oncogenic proteins in cancer. The loading of protein kinases to Hsp90 is actively mediated by the cochaperone Cdc37. The crucial role of the Hsp90-Cdc37 complex has made it an exciting target for cancer treatment. In this study, we characterize Hsp90 and Cdc37 interaction and drug disruption using a reconstituted protein system. The GST pull-down assay and ELISA assay show that Cdc37 binds to ADP-bound/nucleotide-free Hsp90 but not ATP-bound Hsp90. Celastrol disrupts Hsp90-Cdc37 complex formation, whereas the classical Hsp90 inhibitors (e.g. geldanamycin) have no effect. Celastrol inhibits Hsp90 ATPase activity without blocking ATP binding. Proteolytic fingerprinting indicates celastrol binds to Hsp90 C-terminal domain to protect it from trypsin digestion. These data suggest that celastrol may represent a new class of Hsp90 inhibitor by modifying Hsp90 C terminus to allosterically regulate its chaperone activity and disrupt Hsp90-Cdc37 complex.

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Metadata

Authors
Zhang, T., Li, Y., Yu, Y., Zou, P., Jiang, Y., & Sun, D.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-12
Volume
284
Issue
51
Pages
35381-35389
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1993549724
Cited by
199
References
5
FWCI
5.40
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Characterization of Celastrol to Inhibit Hsp90 and Cdc37 Interaction. https://app.cochat.ai/papers/10.1074/jbc.m109.051532
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Zhang, T., Li, Y., Yu, Y., Zou, P., Jiang, Y., & Sun, D. (2009). Characterization of Celastrol to Inhibit Hsp90 and Cdc37 Interaction. Journal of Biological Chemistry. https://doi.org/10.1074/jbc.m109.051532

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