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Growth Inhibition Among Strains of Neisseria gonorrhoeae due to Production of Inhibitory Free Fatty Acids and Lysophosphatidylethanolamine: Absence of Bacteriocins

机译:由于产生抑制性游离脂肪酸和溶血磷脂酰乙醇胺而导致淋病奈瑟氏球菌菌株的生长抑制:缺乏细菌素

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Each of 50 tested strains of Neisseria gonorrhoeae produced growth-inhibitory substances that were active against most strains of gonococci or meningococci, but not against species other than the Neisseria. There were quantitative differences among different strains in production of the inhibitor and sensitivity to it, but not of sufficient magnitude to permit routine strain typing. The inhibitor was associated with the cell pellet (crude cell envelope) and was not inducible with mitomycin C. Inhibitory activity was thermostable and resisted alkali and proteolytic enzymes. The inhibitor was quantitatively recovered from whole cells by chloroform-methanol extraction. Separation of total gonococcal lipids by silica gel chromatography revealed inhibitory activity in both the free fatty acid and the phospholipid fractions. The major phospholipid, phosphatidylethanolamine, had no inhibitory activity, but monoacyl phosphatidylethanolamine, a minor phospholipid, was quite inhibitory. It is likely that the “bacteriocin” of N. gonorrhoeae strains results from the degradation of phosphatidylethanolamine to inhibitory long-chain free fatty acids and monoacyl phosphatidylethanolamine.
机译:测试的50株淋病奈瑟氏球菌中的每一种都产生抑制生长的物质,这些物质对大多数的淋球菌或脑膜炎球菌有活性,但对除淋病奈瑟球菌以外的其他物种没有活性。抑制剂生产过程中不同菌株之间的差异和对​​它的敏感性,但幅度不足以进行常规菌株分型。该抑制剂与细胞沉淀物(粗细胞包膜)相关,丝裂霉素C不能诱导该抑制剂。抑制活性是热稳定的,并能抵抗碱和蛋白水解酶。通过氯仿-甲醇萃取从全细胞中定量回收抑制剂。通过硅胶色谱分离总的淋球菌脂质显示出对游离脂肪酸和磷脂组分的抑制活性。主要的磷脂磷脂酰乙醇胺没有抑制活性,但是单酰基磷脂酰乙醇胺(一种次要的磷脂)则具有很大的抑制作用。可能是 N的“细菌素”。淋球菌菌株是由磷脂酰乙醇胺降解为抑制性长链游离脂肪酸和单酰基磷脂酰乙醇胺所致。

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