Keasling J D, Palsson B O, Cooper S
Department of Chemical Engineering, University of Michigan, Ann Arbor 48109-2136.
J Bacteriol. 1992 Feb;174(3):1060-2. doi: 10.1128/jb.174.3.1060-1062.1992.
The cell-cycle replication pattern of the R6K plasmid has been investigated by using the membrane-elution technique to produce cells labelled at different times during the division cycle and scintillation counting for quantitative analysis of radioactive plasmid DNA. The high-copy plasmid R6K replicates exponentially in a cell-cycle-independent manner. A mini-R6K plasmid deleted for the ori alpha origin of replication also replicates, exponentially in a cell-cycle-independent manner.
通过使用膜洗脱技术来培养在分裂周期不同时间点被标记的细胞,并采用闪烁计数法对放射性质粒DNA进行定量分析,研究了R6K质粒的细胞周期复制模式。高拷贝质粒R6K以与细胞周期无关的方式呈指数复制。缺失oriα复制起点的微型R6K质粒也以与细胞周期无关的方式呈指数复制。