Takano T
Proc Natl Acad Sci U S A. 1971 Jul;68(7):1469-73. doi: 10.1073/pnas.68.7.1469.
Bacterial mutants defective in plasmid formation were selected for their inability to be transduced to chloramphenicol resistance by bacteriophage PlCM. The mutants isolated are indistinguishable from a lon mutant strain. Both the lon strain and the mutants isolated here show very poor lysogenization by P1 and very low transduction to Gal(+) by the plasmid formation of the lambdagal(8)-Nam7am53cI(857). The lon(+) gene function of the host bacteria is indispensable for plasmid formation, even though P1 and lambda(+) can grow normally on the lon strains and lambda(+) can be integrated normally in lon as well as in the lon(+) bacteria. Phage mutants that can persist as plasmids in lon strains were isolated from P1CM. The function of the lon(+) gene is discussed with regard to plasmid formation.
选择在质粒形成方面存在缺陷的细菌突变体,原因是它们无法被噬菌体P1CM转导获得氯霉素抗性。分离得到的突变体与lon突变菌株无法区分。lon菌株和此处分离得到的突变体在被P1溶源化方面表现很差,并且通过λgal(8)-Nam7am53cI(857)的质粒形成向Gal(+)的转导效率也非常低。宿主细菌的lon(+)基因功能对于质粒形成是不可或缺的,尽管P1和λ(+)能在lon菌株上正常生长,并且λ(+)能在lon以及lon(+)细菌中正常整合。从P1CM中分离出了能以质粒形式在lon菌株中持续存在的噬菌体突变体。本文讨论了lon(+)基因在质粒形成方面的功能。