HDX-MS and deletion analysis of the type 4 secretion system protein TraF from the Escherichia coli F plasmid

FEBS Letters
Cristina LentoGerald F Audette

Abstract

Conjugative DNA transfer by the F-plasmid is achieved through a type IV secretion system (T4SS) encoded within the plasmid's transfer region; TraF is one of several F-T4SS proteins essential for F-pilus assembly. In order to identify regions of the protein important for TraF function, a series of deletion mutants were assessed for their ability to recover conjugative transfer in a traF knockout. Interestingly, modification of any region of TraF abolishes pilus synthesis, resulting in a loss of rescue of conjugative function. Dynamic analysis of TraF by time-resolved hydrogen-deuterium exchange revealed that the C-terminal region containing the predicted thioredoxin-like domain is quite structured, while the N-terminal region, predicted to interact with TraH in the intact F-T4SS, was more dynamic.

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