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| Content Provider | PubMed Central |
|---|---|
| Author | Lieb, M. Rehmat, S. |
| 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. |
| Starting Page | 660 |
| File Format | |
| ISSN | 10985530 |
| e-ISSN | 10985530 |
| Journal | Journal of Bacteriology |
| Issue Number | 3 |
| Volume Number | 177 |
| Language | English |
| Publisher Date | 1995-02-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Microbiology |
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