Download MendeleyStructures of the N-terminal and middle domains of E. coli Hsp90 and conformation changes upon ADP binding.
Huai, Q., Wang, H., Liu, Y., Kim, H.Y., Toft, D., Ke, H.(2005) Structure 13: 579-590
- PubMed: 15837196
- DOI: https://doi.org/10.1016/j.str.2004.12.018
- Primary Citation of Related Structures:
1Y4S, 1Y4U - PubMed Abstract:
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.
Organizational Affiliation:
Department of Biochemistry and Biophysics and Lineberger Comprehensive Cancer Center, The University of North Carolina, Chapel Hill, North Carolina 27599, USA.
