大肠杆菌氨基酸饥饿期间细胞尺寸的变化
Changes in cell dimensions during amino acid starvation of Escherichia coli.
作者信息
Grossman N, Ron E Z, Woldringh C L
出版信息
J Bacteriol. 1982 Oct;152(1):35-41. doi: 10.1128/jb.152.1.35-41.1982.
Abstract
Electron microscopic analysis was used to study cells of Escherichia coli B and K-12 during and after amino acid starvation. The results confirmed our previous conclusion that cell division and initiation of DNA replication occur at a smaller cell volume after amino acid starvation. Although during short starvation periods, the number of constricting cells decreased due to residual division, it appears that during prolonged starvation, cells of E. coli B and K-12 were capable of initiating new constrictions. During amino acid starvation, cell diameter decreased significantly. The decrease was reversed only after two generation times after the resumption of protein synthesis and was larger in magnitude than that previously observed before division (F. J. Trueba and C. L. Woldringh, J. Bacteriol. 142:869-878, 1980). This decrease in cell diameter correlates with synchronization of cell division which has been shown to occur after amino acid starvation.
摘要
利用电子显微镜分析研究了氨基酸饥饿期间及之后的大肠杆菌B和K-12细胞。结果证实了我们之前的结论，即氨基酸饥饿后细胞分裂和DNA复制起始发生在较小的细胞体积时。尽管在短时间饥饿期间，由于残留的分裂，收缩细胞的数量减少，但似乎在长时间饥饿期间，大肠杆菌B和K-12细胞能够启动新的收缩。在氨基酸饥饿期间，细胞直径显著减小。这种减小仅在恢复蛋白质合成后的两个世代时间后才逆转，并且幅度大于之前在分裂前观察到的减小（F. J. Trueba和C. L. Woldringh，《细菌学杂志》142:869-878，1980）。细胞直径的这种减小与氨基酸饥饿后已被证明会发生的细胞分裂同步相关。
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