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首页> 外文期刊>Journal of bacteriology >Genetic Requirements of Phage λ Red-Mediated Gene Replacement in Escherichia coli K-12
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Genetic Requirements of Phage λ Red-Mediated Gene Replacement in Escherichia coli K-12

机译:大肠杆菌K-12中噬菌体λ红色介导基因置换的遗传要求

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Recombination between short linear double-stranded DNA molecules and Escherichia coli chromosomes bearing thered genes of bacteriophage λ in place ofrecBCD was tested in strains bearing mutations in genes known to affect recombination in other cellular pathways. The linear DNA was a 4-kb fragment containing the cat gene, with flanking lac sequences, released from an infecting phage chromosome by restriction enzyme cleavage in the cell; formation of Lac? chloramphenicol-resistant bacterial progeny was measured. Recombinant formation was found to be reduced inruvAB and recQ strains. In this genetic background, mutations in recF, recO, andrecR had large effects on both cell viability and on recombination. In these cases, deletion of the sulA gene improved viability and strain stability, without improving recombination ability. Expression of a gene(s) from the ninregion of phage λ partially complemented both the viability and recombination defects of the recF, recO, andrecR mutants and the recombination defect ofruvC but not of ruvAB or recQmutants.
机译:测试了短线性双链DNA分子与带有噬菌体λ的 red 基因的大肠杆菌染色体代替 recBCD 的重组已知会影响其他细胞途径重组的基因突变。线性DNA是一个4kb的片段,包含 cat 基因,具有侧翼的 lac 序列,通过限制性内切酶在细胞内裂解而从感染噬菌体染色体中释放出来。测量了Lac ?耐氯霉素细菌后代的形成。发现在 ruvAB recQ 菌株中重组形成减少。在这种遗传背景下, recF recO recR 的突变对细胞活力和重组均具有重大影响。在这些情况下, sulA 基因的缺失改善了活力和菌株稳定性,而没有提高重组能力。来自噬菌体λ的 nin 区域的基因的表达部分补充了 recF recO recR 突变体和 ruvC 的重组缺陷,但不是 ruvAB recQ 突变体的重组缺陷。

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