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SHR Neuro Cancer Cardio Lipid Metab Microb

Röhl, A; Wengler, D; Madl, T; Lagleder, S; Tippel, F; Herrmann, M; Hendrix, J; Richter, K; Hack, G; Schmid, AB; Kessler, H; Lamb, DC; Buchner, J.
Hsp90 regulates the dynamics of its cochaperone Sti1 and the transfer of Hsp70 between modules.
Nat Commun. 2015; 6(6):6655-6655 Doi: 10.1038/ncomms7655 [OPEN ACCESS]
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Co-authors Med Uni Graz: Madl Tobias
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Abstract:: The cochaperone Sti1/Hop physically links Hsp70 and Hsp90. The protein exhibits one binding site for Hsp90 (TPR2A) and two binding sites for Hsp70 (TPR1 and TPR2B). How these sites are used remained enigmatic. Here we show that Sti1 is a dynamic, elongated protein that consists of a flexible N-terminal module, a long linker and a rigid C-terminal module. Binding of Hsp90 and Hsp70 regulates the Sti1 conformation with Hsp90 binding determining with which site Hsp70 interacts. Without Hsp90, Sti1 is more compact and TPR2B is the high-affinity interaction site for Hsp70. In the presence of Hsp90, Hsp70 shifts its preference. The linker connecting the two modules is crucial for the interaction with Hsp70 and for client activation in vivo. Our results suggest that the interaction of Hsp70 with Sti1 is tightly regulated by Hsp90 to assure transfer of Hsp70 between the modules, as a prerequisite for the efficient client handover.
Find related publications in this database (using NLM MeSH Indexing): Binding Sites -; Escherichia coli -; HSP70 Heat-Shock Proteins - metabolism; HSP90 Heat-Shock Proteins - metabolism; Heat-Shock Proteins - genetics; Heat-Shock Proteins - metabolism; In Vitro Techniques -; Magnetic Resonance Spectroscopy -; Molecular Chaperones - metabolism; Saccharomyces cerevisiae -; Saccharomyces cerevisiae Proteins - genetics; Saccharomyces cerevisiae Proteins - metabolism; Surface Plasmon Resonance -