Ritchie L J, Hall R M, Podger D M
J Bacteriol. 1986 Jul;167(1):420-2. doi: 10.1128/jb.167.1.420-422.1986.
A mutant of Salmonella typhimurium LT2 deficient in methylation of the adenine residues in the sequence 5'-GATC-3' was isolated. The mutation (dam-1) was linked to the cysG locus, and the properties of the mutant were similar to those of Escherichia coli dam mutants. Reversion of the hisC3076 frameshift marker by 9-aminoacridine was substantially enhanced by the dam-1 mutation, implying a direct role for adenine methylation in the prevention of frameshift mutation induction.
分离出一株鼠伤寒沙门氏菌LT2突变体,该突变体在5'-GATC-3'序列中的腺嘌呤残基甲基化方面存在缺陷。该突变(dam-1)与cysG基因座连锁,且该突变体的特性与大肠杆菌dam突变体相似。dam-1突变显著增强了9-氨基吖啶对hisC3076移码标记的回复突变作用,这意味着腺嘌呤甲基化在防止移码突变诱导中具有直接作用。