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Twin-arginine translocase component TatB performs folding quality control via a chaperone-like activity. | LitMetric

AI Article Synopsis

Article Abstract

The twin-arginine translocation (Tat) pathway involves an inbuilt quality control (QC) system that synchronizes the proofreading of substrate protein folding with lipid bilayer transport. However, the molecular details of this QC mechanism remain poorly understood. Here, we hypothesized that the conformational state of Tat substrates is directly sensed by the TatB component of the bacterial Tat translocase. In support of this hypothesis, several TatB variants were observed to form functional translocases in vivo that had compromised QC activity as evidenced by the uncharacteristic export of several misfolded protein substrates. These variants each possessed cytoplasmic membrane-extrinsic domains that were either truncated or mutated in the vicinity of a conserved, highly flexible α-helical domain. In vitro folding experiments revealed that the TatB membrane-extrinsic domain behaved like a general molecular chaperone, transiently binding to highly structured, partially unfolded intermediates of a model protein, citrate synthase, in a manner that prevented its irreversible aggregation and stabilized the active species. Collectively, these results suggest that the Tat translocase may use chaperone-like client recognition to monitor the conformational status of its substrates.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9436932PMC
http://dx.doi.org/10.1038/s41598-022-18958-3DOI Listing

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