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• W2891749587 abstract "Chaperonins are ubiquitous protein assemblies present in bacteria, eukaryota, and archaea, facilitating the folding of proteins, preventing protein aggregation, and thus participating in maintaining protein homeostasis in the cell. During their functional cycle, they bind unfolded client proteins inside their double ring structure and promote protein folding by closing the ring chamber in an adenosine 5'-triphosphate (ATP)-dependent manner. Although the static structures of fully open and closed forms of chaperonins were solved by x-ray crystallography or electron microscopy, elucidating the mechanisms of such ATP-driven molecular events requires studying the proteins at the structural level under working conditions. We introduce an approach that combines site-specific nuclear magnetic resonance observation of very large proteins, enabled by advanced isotope labeling methods, with an in situ ATP regeneration system. Using this method, we provide functional insight into the 1-MDa large hsp60 chaperonin while processing client proteins and reveal how nucleotide binding, hydrolysis, and release control switching between closed and open states. While the open conformation stabilizes the unfolded state of client proteins, the internalization of the client protein inside the chaperonin cavity speeds up its functional cycle. This approach opens new perspectives to study structures and mechanisms of various ATP-driven biological machineries in the heat of action." @default.
• W2891749587 created "2018-09-27" @default.
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• W2891749587 date "2018-09-07" @default.
• W2891749587 modified "2023-09-30" @default.
• W2891749587 title "Structural investigation of a chaperonin in action reveals how nucleotide binding regulates the functional cycle" @default.
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• W2891749587 doi "https://doi.org/10.1126/sciadv.aau4196" @default.
• W2891749587 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6154984" @default.
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• W2891749587 hasPublicationYear "2018" @default.
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