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Default Chaperone–client complexes: A dynamic liaison

Chaperone–client complexes: A dynamic liaison

Publication date: April 2018
Source:Journal of Magnetic Resonance, Volume 289

Author(s): Sebastian Hiller, Björn M. Burmann

Living cells contain molecular chaperones that are organized in intricate networks to surveil protein homeostasis by avoiding polypeptide misfolding, aggregation, and the generation of toxic species. In addition, cellular chaperones also fulfill a multitude of alternative functionalities: transport of clients towards a target location, help them fold, unfold misfolded species, resolve aggregates, or deliver clients towards proteolysis machineries. Until recently, the only available source of atomic resolution information for virtually all chaperones were crystal structures of their client-free, apo-forms. These structures were unable to explain details of the functional mechanisms underlying chaperone–client interactions. The difficulties to crystallize chaperones in complexes with clients arise from their highly dynamic nature, making solution NMR spectroscopy the method of choice for their study. With the advent of advanced solution NMR techniques, in the past few years a substantial number of structural and functional studies on chaperone–client complexes have been resolved, allowing unique insight into the chaperone–client interaction. This review summarizes the recent insights provided by advanced high-resolution NMR-spectroscopy to understand chaperone–client interaction mechanisms at the atomic scale.
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