1887

Abstract

SUMMARY: Induction of cloacin DF13 synthesis in harbouring plasmid CloDF13 results in the release of cloacin DF13, inhibition of growth and ultimately in lysis of the host cells. Expression of the pCloDF13-encoded protein H is essential for both the release of cloacin DF13 and the lysis of the cells. The divalent cations Mg and Ca interfered with the mitomycin C-induced, protein H-dependent lysis, but hardly affected the release of cloacin DF13. Essentially all of the bacteriocin was released from the cells before a detectable degradation of the peptidoglycan occurred, independent of the presence of mitomycin C. Experiments with phospholipase A mutants revealed that activation of detergent-resistant phospholipase A was essential for the export of cloacin DF13 across the outer membrane and the lysis of induced cells. Transport of cloacin DF13 across the cytoplasmic membrane was mainly dependent on protein H. A revised model for the excretion of cloacin DF13 is presented.

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1986-03-01
2021-10-25
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