The cellular activity of several regulatory and signal transduction proteins, which depend on the Hsp90 molecular chaperone for folding, is markedly decreased by geldanamycin and by radicicol (monorden). We now show that these unrelated compounds both bind to the N-terminal ATP/ADP-binding domain of Hsp90, with radicicol displaying nanomolar affinity, and both inhibit the inherent ATPase activity of Hsp90 which is essential for its function in vivo ...
The cellular activity of several regulatory and signal transduction proteins, which depend on the Hsp90 molecular chaperone for folding, is markedly decreased by geldanamycin and by radicicol (monorden). We now show that these unrelated compounds both bind to the N-terminal ATP/ADP-binding domain of Hsp90, with radicicol displaying nanomolar affinity, and both inhibit the inherent ATPase activity of Hsp90 which is essential for its function in vivo. Crystal structure determinations of Hsp90 N-terminal domain complexes with geldanamycin and radicicol identify key aspects of their nucleotide mimicry and suggest a rational basis for the design of novel antichaperone drugs.
Related Citations:
Identification and Structural Characterization of the ATP/Adp-Binding Site in the Hsp90 Molecular Chaperone Prodromou, C., Roe, S.M., O'Brien, R., Ladbury, J.E., Piper, P.W., Pearl, L.H. (1997) Cell 90: 65
Expression and Crystallization of the Yeast Hsp82 Chaperone, and Preliminary X-Ray Diffraction Studies of the Amino-Terminal Domain Prodromou, C., Piper, P.W., Pearl, L.H. (1996) Proteins 25: 517
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, University College London, Gower Street, London WC1E 6BT, UK.
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