Search Organism: All OrganismsArabidopsis thalianaBacillus subtilis 168Bos taurusCaenorhabditis elegansCanis familiarisDanio rerioDrosophila melanogasterEquus caballusEscherichia coli K12Gallus gallusHomo sapiensMacaca mulattaMus musculusNematostella vectensisOryza sativaPan troglodytesRattus norvegicusSaccharomyces cerevisiaeSchizosaccharomyces pombeStrongylocentrotus purpuratusTakifugu rubripesXenopus laevis home help / support contribute downloads mirrors about us J. Biol. Chem. Sep (2002); 277(37):33698-703 Nucleotide binding states of hsp70 and hsp90 during sequential steps in the process of glucocorticoid receptor.hsp90 heterocomplex assembly. Kanelakis KC, Shewach DS, Pratt WB Department of Pharmacology, The University of Michigan Medical School, 1301 Medical Research Building III, Ann Arbor, MI 48109, USA. Abstract: A minimal system of five purified proteins, hsp90, hsp70, Hop, hsp40, and p23, assembles glucocorticoid receptor (GR).hsp90 heterocomplexes and causes the simultaneous opening of the steroid binding cleft to access by steroid. The first step in assembly is the ATP-dependent and hsp40 (YDJ-1)-dependent binding of hsp70 to the GR, which primes the receptor for subsequent ATP-dependent activation by hsp90, Hop, and p23 (Morishima, Y., Murphy, P. J. M., Li, D. P., Sanchez, E. R., and Pratt, W. B. (2000) J. Biol. Chem. 275, 18054-18060). Here we have examined the nucleotide-bound states of the two essential chaperones in each step. We show that it is the ATP-bound state of hsp70 that interacts initially with the GR. After rapid priming and washing, the primed GR.hsp70 complex rapidly binds hsp90 in the second step reaction in a nucleotide-independent manner. The rate-limiting step is the ATP-dependent opening of the steroid binding cleft after hsp90 binding. This activating step requires the N-terminal ATP-binding site of hsp90, but we cannot establish any role for a C-terminal ATP-binding site in steroid binding cleft opening. The reported specific inhibitors of the C-terminal ATP site on hsp90 inhibit the generation of steroid binding, but they have other effects in this multiprotein system that could explain the inhibition. [PUBMED: 12093808] Copyright © 2009, Tyers Lab, The Samuel Lunenfeld Research Institute, Mount Sinai Hospital, All Rights Reserved. terms and conditions - privacy policy - Osprey Network Visualization System BioGRID: A General Repository for Interaction Datasets. Chris Stark, Bobby-Joe Breitkreutz, Teresa Reguly, Lorrie Boucher, Ashton Breitkreutz, Mike Tyers. Nucleic Acids Res. Jan 1;34:D535-9.