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Visualization and mechanism of assembly of a glucocorticoid receptorcntdothsp70 complex that is primed for subsequent hsp90-dependent opening of the steroid binding cleft

Visualization and mechanism of assembly of a glucocorticoid receptorcntdothsp70 complex that is primed for subsequent hsp90-dependent opening of the steroid binding cleft

Journal of Biological Chemistry 278(37): 34764-34773

ISSN/ISBN: 0021-9258

A minimal system of five proteins, hsp90, hsp70, Hop, hsp40, and p23, assembles glucocorticoid receptor (GR)cntdothsp90 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 formation of a GRcntdothsp70 complex that primes the receptor for subsequent ATP-dependent activation by hsp90, Hop, and p23. This study focuses on three aspects of the GR priming reaction with hsp70. First, we have visualized the primed GRcntdothsp70 complexes by atomic force microscopy, and we find the most common stoichiometry to be 1:1, with some complexes of a size apprx1:2 and a few complexes of larger size. Second, in a recent study of progesterone receptor priming, it was shown that hsp40 binds first, leading to the notion that it targets hsp70 to the receptor. We show here that hsp40 does not perform such a targeting function in priming the GR. Third, we focus on a short amino-terminal segment of the ligand binding domain that is required for GRcntdothsp90 heterocomplex assembly. By using two glutathione S-transferase (GST)/ligand binding domain fusions with (GST/520C) and without (GST/554C) hsp90 binding and steroid binding activity, we show that the priming step with hsp70 occurs with GST/554C, and it is the subsequent assembly step with hsp90 that is defective.

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