Abstract:
:In Escherichia coli, T:G mismatches in specific contexts are corrected by a very short patch (VSP) repair system. Previous studies have shown that the product of gene vsr mediates correction of T:G to C:G in the 5'CTAGG/3'GGTCC context and in some related contexts. Amber mutations that arose in CAG sequences in gene cI of bacteriophage lambda were used to determine the effect of flanking bases on the repair of T:G mispairs arising during phage recombination. The experimental findings were combined with published data on mismatch repair of mutations in lambda gene P and E. coli gene lacI. While VSP repair was most efficient in the context 5'CTAGG, there was very significant correction when either the 5'C or the 3' G was replaced by another base. Some mismatch repair of TAG to CAG occurred in all contexts tested. Reduction in VSP repair caused by the lack of MutL or MutS was fully complemented by the addition of vsr+ plasmids when the T:G mispair was in the 5'CTAGG/3'GGTCC context. VSP repair was decreased in bacteria containing mutS+ on a multicopy plasmid. It is suggested that VSP repair maintains sequences such as the repetitive extragenic palindromic (REP) and Chi sequences, which have important roles in E. coli and closely related bacteria.
journal_name
J Bacterioljournal_title
Journal of bacteriologyauthors
Lieb M,Rehmat Sdoi
10.1128/jb.177.3.660-666.1995subject
Has Abstractpub_date
1995-02-01 00:00:00pages
660-6issue
3eissn
0021-9193issn
1098-5530journal_volume
177pub_type
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