p50(cdc37) is a nonexclusive hsp90 cohort which participates intimately in hsp90-mediated folding of immature kinase molecules

Steven D. Hartson, Angela D. Irwin, Jieya Shao, Bradley T. Scroggins, Lenora Volk, Wenjun Huang, Robert L. Matts

Research output: Contribution to journalArticlepeer-review

75 Scopus citations


Hsp90 and p50(cdc37) provide a poorly understood biochemical function essential to certain protein kinases, and recent models describe p50(cdc37) as an exclusive hsp90 cohort which links hsp90 machinery to client kinases. We describe here the recovery of p50(cdc37) in immunoadsorptions directed against the hsp90 cohorts FKBP52, cyp40, p60HOP, hsp70, and p23. Additionally, monoclonal antibodies against FKBP52 coadsorb maturation intermediates of the hsp90-dependent kinases p56(tck) and HRI, and the presence of these maturation intermediates significantly increases the representation of p50(cdc37) and hsp90 on FKPB52 machinery. Although the native heterocomplex between hsp90 and p50(cdc7) is salt-labile, their dynamic interactions with kinase substrates produce kinase-chaperone heterocomplexes which are highly salt-resistant. The hsp90 inhibitor geldanamycin does not directly disrupt the native association of hsp90 with p50(cdc37) per se, but does result in the formation of salt-labile hsp90- kinase heterocomplexes which lack the p50(cdc37) cohort. We conclude that p50(cdc37) does not simply serve as a passive structural bridge between hsp90 and its kinase substrates; instead, p50(cdc37) is a nonexclusive hsp90 cohort which responds to hsp90's nucleotide-regulated conformational switching during the generation of high-affinity interactions within the hsp90-kinase- p50(cdc37) heterocomplex.

Original languageEnglish (US)
Pages (from-to)7631-7644
Number of pages14
Issue number25
StatePublished - Jun 27 2000
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry


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