Promiscuous substrate recognition in folding and assembly activities of the trigger factor chaperone.

Promiscuous substrate recognition in folding and assembly activities of the trigger factor chaperone.
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DOI:
10.1016/j.cell.2009.07.044
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发表时间:
2009-09-04
期刊:
影响因子:
64.5
通讯作者:
Hendrickson WA
Hendrickson WA
中科院分区:
生物学1区
文献类型:
--
作者:
Martinez-Hackert E;Hendrickson WA

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Trigger factor (TF) is a molecular chaperone that famously binds to bacterial ribosomes where it contacts emerging nascent chains, but TF is also abundant free in the cytosol where its activity is less well characterized. In vitro studies show that TF promotes protein refolding. We find here that ribosome-free TF stably associates with and rescues from misfolding a large repertoire of full-length proteins. We identify over 170 members of this cytosolic Escherichia coli TF substrate proteome, including ribosomal protein S7. We analyzed the biochemical properties of a TF:S7 complex from Thermotoga maritima and determined its crystal structure. This is the first atomic-level structure of a promiscuous chaperone in complex with a physiological substrate protein. The structure of the complex reveals the molecular basis of substrate recognition by TF, indicates how TF could accelerate protein folding and suggests a role for TF in the biogenesis of protein complexes.
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