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• W2462113224 abstract "Defensins are smalL cysteine-rich antimicrobial peptides that are abundant in human, rabbit, and guinea pig neutrophils (PMN). Three defensins (human neutrophil peptide defensin [HNP-1, HNP-2, and HNP-3) constitute between 30 and 50% of the total protein in azurophil granules of human PMN. We examined the mechanism ofHNP-mediated bactericidal activity against Escherichia coli ML-35 (i-, y-, z+) and its pBR322-transformed derivative, E. coli ML-35p. Under conditions that supported bactericidal activity, HNP-1 sequentially permeabilized the outer membrane (OM) and inner membrane (IM) ofE. coli. Coincident with these events, bacterial synthesis ofDNA, RNA, and protein ceased and the colony count fell. Although these events were closely coupled under standard assay conditions,OM permeabilization was partially dissociated from IM permeabilization when experiments were performed with E. coli that had been plasmolyzed by mannitol. Under such conditions, the rate and extent of bacterial death more closely paralleled loss ofIM integrity thanOM permeabilization. Electron microscopy of E. coli that had been killed by defensins revealed the presence of striking electron-dense deposits in the periplasmic space and affixed to the OM. Overall, these studies show that HNP-mediated bactericidal activity against E. coli ML-35 is associated with sequential permeabilization oftheOM and IM, and that inner membrane permeabilization appears to be the lethal event." @default.
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• W2462113224 date "1989-01-01" @default.
• W2462113224 modified "2023-09-26" @default.
• W2462113224 title "Interaction of Human Defensins with Escherichia coni" @default.
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