MUTAGENESIS AND REPAIR DEFICIENCIES OF ESCHERICHIA-COLI UMUC MUTANTS ARE SUPPRESSED BY THE PLASMID PKM101

被引:134
作者
WALKER, GC
DOBSON, PP
机构
[1] Biology Department, Massachusetts Institute of Technology, Cambridge, 02139, MA
来源
MOLECULAR & GENERAL GENETICS | 1979年 / 172卷 / 01期
关键词
D O I
10.1007/BF00276210
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The presence of the drug resistance plasmid pKM101 restored the ability of Escherichia coli umuC mutant strains to be mutated by methyl methanesulfonate. Inducible (Weigle) reactivation of ultravioletirradiated bacteriophage λ was not observed in uvrA6 umuC mutant strains lacking pKM101 but was observed if the plasmid was present in the strains. In a uvrA+umuC36 strain pKM101 increased the efficiency of the Weigle reactivation process. Plasmidmediated UV-resistance and plasmid-mediated phage reactivation were observed in umuC(pKM101) strains both in uvrA+and uvrA6 backgrounds. No restoration of methyl methanesulfonate mutability by pKM101 was observed in umuC36 recA56 strains. pKM101 mutants unable to enhance mutagenesis in umuC+backgrounds also had no effect on methyl methanesulfonate mutagenesis in umuC mutant strains. Neither a umuC mutation nor the presence of pKM101 affected the UV induction of protein X, the recA protein. Hypotheses relating the mode of action of pKM101 to the processes of mutagenesis and inducible phage reactivation are discussed. © 1979 Springer-Verlag.
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页码:17 / 24
页数:8
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