1y4u

From Proteopedia

Revision as of 14:01, 21 February 2008

Conformation rearrangement of heat shock protein 90 upon ADP binding

Overview

Hsp90 is an abundant molecular chaperone involved in many biological systems. We report here the crystal structures of the unliganded and ADP bound fragments containing the N-terminal and middle domains of HtpG, an E. coli Hsp90. These domains are not connected through a flexible linker, as often portrayed in models, but are intimately associated with one another. The individual HtpG domains have similar folding to those of DNA gyrase B but assemble differently, suggesting somewhat different mechanisms for the ATPase superfamily. ADP binds to a subpocket of a large site that is jointly formed by the N-terminal and middle domains and induces conformational changes of the N-terminal domain. We speculate that this large pocket serves as a putative site for binding of client proteins/cochaperones. Modeling shows that ATP is not exposed to the molecular surface, thus implying that ATP activation of hsp90 chaperone activities is accomplished via conformational changes.

About this Structure

1Y4U is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Structures of the N-terminal and middle domains of E. coli Hsp90 and conformation changes upon ADP binding., Huai Q, Wang H, Liu Y, Kim HY, Toft D, Ke H, Structure. 2005 Apr;13(4):579-90. PMID:15837196

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