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大肠杆菌B/r胸腺嘧啶饥饿突变体中染色体复制与细胞分裂的关系

Relationship between chromosome replication and cell division in a thymineless mutant of Escherichia coli B/r.

作者信息

Meacock P A, Pritchard R H

出版信息

J Bacteriol. 1975 Jun;122(3):931-42. doi: 10.1128/jb.122.3.931-942.1975.

Abstract

The relationship between chromosome replication and cell division was investigated in a thymineless mutant of Escherichia coli B/r. Examination of the changes in average cell mass and DNA content of exponential cultures resulting from changes in the thymine concentration in the growth medium suggested that as the replication time (C) is increased there is a decrease in the period between termination of a round of replication and the subsequent cell division (D). Observations on the pattern of DNA synthesis during the division cycle were consistent with this relationship. Nevertheless, the kinetics of transition of exponential cultures moving between steady states of growth with differing replication velocities provided evidence to support the view that the time of cell division is determined by termination of rounds of replication under steady-state conditions.

摘要

在大肠杆菌B/r的一个无胸腺嘧啶突变体中研究了染色体复制与细胞分裂之间的关系。通过检测生长培养基中胸腺嘧啶浓度变化导致的指数生长期培养物平均细胞质量和DNA含量的变化,发现随着复制时间(C)增加,一轮复制终止与随后细胞分裂之间的时间间隔(D)缩短。对分裂周期中DNA合成模式的观察与这种关系一致。然而,指数生长期培养物在不同复制速度的稳定生长状态之间转换的动力学提供了证据,支持细胞分裂时间由稳态条件下复制轮次的终止所决定这一观点。

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