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革兰氏阴性菌会产生能够杀死其他细菌的膜泡。

Gram-negative bacteria produce membrane vesicles which are capable of killing other bacteria.

作者信息

Li Z, Clarke A J, Beveridge T J

机构信息

Canadian Bacterial Disease Network, Department of Microbiology, College of Biological Science, University of Guelph, Guelph, Ontario, Canada N1G 2W1.

出版信息

J Bacteriol. 1998 Oct;180(20):5478-83. doi: 10.1128/JB.180.20.5478-5483.1998.

Abstract

Naturally produced membrane vesicles (MVs), isolated from 15 strains of gram-negative bacteria (Citrobacter, Enterobacter, Escherichia, Klebsiella, Morganella, Proteus, Salmonella, and Shigella strains), lysed many gram-positive (including Mycobacterium) and gram-negative cultures. Peptidoglycan zymograms suggested that MVs contained peptidoglycan hydrolases, and electron microscopy revealed that the murein sacculi were digested, confirming a previous modus operandi (J. L. Kadurugamuwa and T. J. Beveridge, J. Bacteriol. 174:2767-2774, 1996). MV-sensitive bacteria possessed A1alpha, A4alpha, A1gamma, A2alpha, and A4gamma peptidoglycan chemotypes, whereas A3alpha, A3beta, A3gamma, A4beta, B1alpha, and B1beta chemotypes were not affected. Pseudomonas aeruginosa PAO1 vesicles possessed the most lytic activity.

摘要

从15株革兰氏阴性菌(柠檬酸杆菌属、肠杆菌属、大肠杆菌属、克雷伯菌属、摩根氏菌属、变形杆菌属、沙门氏菌属和志贺氏菌属菌株)中分离出的天然产生的膜泡(MVs),能裂解许多革兰氏阳性菌(包括分枝杆菌)和革兰氏阴性菌培养物。肽聚糖酶谱分析表明MVs含有肽聚糖水解酶,电子显微镜显示胞壁质囊被消化,证实了先前的作用方式(J. L. 卡杜鲁加穆瓦和T. J. 贝弗里奇,《细菌学杂志》174:2767 - 2774,1996)。对MVs敏感的细菌具有A1α、A4α、A1γ、A2α和A4γ肽聚糖化学型,而A3α、A3β、A3γ、A4β、B1α和B1β化学型不受影响。铜绿假单胞菌PAO1膜泡具有最强的裂解活性。

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