Characterization of the 90 kDa heat shock protein (HSP90)-associated ATP/GTPase

Gábor Nardai, Tamas Schnaider, Csaba Söti, Michael T. Ryan, Peter B. Hoj, Jänos Somogyi, Péter Csermely

Research output: Contribution to journalArticle

21 Citations (Scopus)


The 90 kDa heat shock protein (HSP90) is an ATP-binding molecular chaperone with an associated ATPase activity having nucleoplasmin and HSP70-binding homology domains and containing Ca-binding EF-hands and a nuclear localization signal. Here we characterize the HSP90-associated ATPase and show that it is (i) a P-type ATPase inhibited by molybdate and vanadate, (ii) able to hydrolyze methyifluorescein phosphate with a 5-6-fold higher affinity, (iii) a 3-times better GTPase than ATPase in the presence of calcium and (iv) HSP27 and F-actin, but not HSP10 can "convert" the HSP90-associated ATPase activity to HSP90 autokinase activity. The HSP90-associated ATP/GTPase may participate in the regulation of complex formation of HSP90 with other proteins, such as F-actin, tubulin and heat shock proteins.

Original languageEnglish
Pages (from-to)179-190
Number of pages12
JournalJournal of Biosciences
Issue number2
Publication statusPublished - Apr 1996


  • HSP10
  • HSP27
  • Methylfluorescein phosphate
  • Molecular chaperone
  • Molybdate
  • Vanadate

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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