Escherichia coli strains blocked in Tat-dependent protein export exhibit pleiotropic defects in the cell envelope

Nicola R. Stanley, Kim Findlay, Ben C. Berks, Tracy Palmer

    Research output: Contribution to journalArticle

    136 Citations (Scopus)

    Abstract

    The Tat system is a recently discovered protein export pathway that serves to translocate folded proteins, often containing redox cofactors, across the bacterial cytoplasmic membrane. Here we report that tat strains are associated with a mutant cell septation phenotype, where chains of up to 10 cells are evident. Mutant strains are also hypersensitive to hydrophobic drugs and to lysis by lysozyme in the absence of EDTA, and they leak periplasmic enzymes, characteristics that are consistent with an outer membrane defect. Both phenotypes are similar to those displayed by strains carrying point mutations in the lpxC (envA) gene. The phenotype was not replicated by mutations affecting synthesis and/or activity of all known or predicted Tat substrates.
    Original languageEnglish
    Pages (from-to)139-144
    Number of pages6
    JournalJournal of Bacteriology
    Volume183
    Issue number1
    DOIs
    Publication statusPublished - 2001

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