Konrad E B
J Bacteriol. 1977 Apr;130(1):167-72. doi: 10.1128/jb.130.1.167-172.1977.
A method is described for the isolation of Escherichia coli mutants that show increased recombination between a pair of chromosomal duplications. These "hyper-rec" mutants display a variety of secondary phenotypes. I have isolated a large number of hyper-rec mutants and found them useful in screening for mutants that accumulate labeled DNA fragments after short pulses with [3H]thymidine. The mutants so recovered include ones that are defective in deoxyribonucleic acid ligase, deoxyribonucleic acid polymerase I and its associated 5' yields 3' exonuclease, and a group of mutants, dnaS, that accumulate abnormally short Okazaki fragments. Evidence is presented that suggests that the lac-att80 segment of the chromosome cannot be inverted.
本文描述了一种分离大肠杆菌突变体的方法,这些突变体在一对染色体重复序列之间表现出增加的重组。这些“高重组”突变体表现出多种次级表型。我已经分离出大量的高重组突变体,并发现它们可用于筛选在用[3H]胸苷短脉冲处理后积累标记DNA片段的突变体。如此回收的突变体包括那些在脱氧核糖核酸连接酶、脱氧核糖核酸聚合酶I及其相关的5'→3'核酸外切酶中存在缺陷的突变体,以及一组积累异常短冈崎片段的dnaS突变体。有证据表明染色体的lac-att80区段不能倒转。