蛋氨酸对枯草芽孢杆菌趋化性的影响。
Effect of methionine on chemotaxis by Bacillus subtilis.
作者信息
Ordal G W
出版信息
J Bacteriol. 1976 Mar;125(3):1005-12. doi: 10.1128/jb.125.3.1005-1012.1976.
Abstract
Bacillus subtilis, like Escherichia coli and Salmonella typhimurium, carries out chemotaxis by modulating the relative frequency of smooth swimming and tumbling. Like these enteric bacteria, methionine auxotrophs starved for methionine show an abnormally long-period of smooth swimming after addition of attractant. This "hypersensitive" state requires an hour of starvation for its genesis, which can be hastened by including alanine, a strong attractant, in starvation medium. Susceptibility to repellent, which causes transient tumbling when added, if anything, increases slightly by starvation for methionine. The results are interpreted by postulating the existence of a methionine-derived structure that hastens recovery of attractant-stimulated bacteria back to normal.
摘要
枯草芽孢杆菌与大肠杆菌和鼠伤寒沙门氏菌一样，通过调节平滑游动和翻滚的相对频率来进行趋化作用。与这些肠道细菌一样，缺乏蛋氨酸的蛋氨酸营养缺陷型在添加引诱剂后会出现异常长的平滑游动期。这种“超敏感”状态的形成需要一小时的饥饿，在饥饿培养基中加入强引诱剂丙氨酸可以加速这一过程。对驱避剂的敏感性（添加驱避剂会导致短暂翻滚），如果有的话，会因蛋氨酸饥饿而略有增加。通过假设存在一种由蛋氨酸衍生的结构来解释这些结果，该结构可加速受引诱剂刺激的细菌恢复到正常状态。
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