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• W2781800146 abstract "ABSTRACT Bacterial conjugation, a mechanism of horizontal gene transfer, is the major means by which antibiotic resistance spreads among bacteria (1, 2). Conjugative plasmids are transferred from one bacterium to another through a type IV secretion system (T4SS) in the form of single-stranded DNA covalently attached to a protein called relaxase. The relaxase is fully functional both in a donor cell (prior to conjugation) and recipient cell (after conjugation). Here, we demonstrate that the protein substrate has to unfold for efficient translocation through the conjugative T4SS. Furthermore, we present various relaxase modifications that preserve the function of the relaxase but block substrate translocation. This study brings us a step closer to deciphering the complete mechanism of T4SS substrate translocation, which is vital for the development of new therapies against multidrug-resistant pathogenic bacteria. IMPORTANCE Conjugation is the principal means by which antibiotic resistance genes spread from one bacterium to another (1, 2). During conjugation, a covalent complex of single-stranded DNA and a protein termed relaxase is transported by a type IV secretion system. To date, it is not known whether the relaxase requires unfolding prior to transport. In this report, we use functional assays to monitor the transport of wild-type relaxase and variants containing unfolding-resistant domains and show that these domains reduce conjugation and protein transport dramatically. Mutations that lower the free energy of unfolding in these domains do not block translocation and can even promote it. We thus conclude that the unfolding of the protein substrate is required during transport." @default.
• W2781800146 created "2018-01-12" @default.
• W2781800146 creator A5073364560 @default.
• W2781800146 creator A5081951575 @default.
• W2781800146 date "2018-03-15" @default.
• W2781800146 modified "2023-10-14" @default.
• W2781800146 title "Translocation through the Conjugative Type IV Secretion System Requires Unfolding of Its Protein Substrate" @default.
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• W2781800146 doi "https://doi.org/10.1128/jb.00615-17" @default.
• W2781800146 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5826034" @default.
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• W2781800146 hasPublicationYear "2018" @default.
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