Saccharomyces cerevisiae Msh2-Msh3 Acts in Repair of Base-Base Mispairs
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چکیده
منابع مشابه
Role of Saccharomyces cerevisiae Msh2 and Msh3 repair proteins in double-strand break-induced recombination.
When gene conversion is initiated by a double-strand break (DSB), any nonhomologous DNA that may be present at the ends must be removed before new DNA synthesis can be initiated. In Saccharomyces cerevisiae, removal of nonhomologous ends depends not only on the nucleotide excision repair endonuclease Rad1/Rad10 but also on Msh2 and Msh3, two proteins that are required to correct mismatched bp. ...
متن کاملCrosstalk between MSH2–MSH3 and polβ promotes trinucleotide repeat expansion during base excision repair
Studies in knockout mice provide evidence that MSH2-MSH3 and the BER machinery promote trinucleotide repeat (TNR) expansion, yet how these two different repair pathways cause the mutation is unknown. Here we report the first molecular crosstalk mechanism, in which MSH2-MSH3 is used as a component of the BER machinery to cause expansion. On its own, pol β fails to copy TNRs during DNA synthesis,...
متن کاملFunctional studies and homology modeling of Msh2-Msh3 predict that mispair recognition involves DNA bending and strand separation.
The Msh2-Msh3 heterodimer recognizes various DNA mispairs, including loops of DNA ranging from 1 to 14 nucleotides and some base-base mispairs. Homology modeling of the mispair-binding domain (MBD) of Msh3 using the related Msh6 MBD revealed that mismatch recognition must be different, even though the MBD folds must be similar. Model-based point mutation alleles of Saccharomyces cerevisiae msh3...
متن کاملRequirement for Msh6, but not for Swi4 (Msh3), in Msh2-dependent repair of base-base mismatches and mononucleotide loops in Schizosaccharomyces pombe.
The msh6 mismatch repair gene of Schizosaccharomyces pombe was cloned, sequenced, and inactivated. Strains bearing all combinations of inactivated msh6, msh2, and swi4 (the S. pombe MSH3 ortholog) alleles were tested for their defects in mitotic and meiotic mismatch repair. Mitotic mutation rates were similarly increased in msh6 and msh2 mutants, both for reversion of a base-base substitution a...
متن کاملThe role of mismatch repair in the prevention of base pair mutations in Saccharomyces cerevisiae.
In most organisms, the mismatch repair (MMR) system plays an important role in substantially lowering mutation rates and blocking recombination between nonidentical sequences. In Saccharomyces cerevisiae, the products of three genes homologous to Escherichia coli mutS-MSH2, MSH3, and MSH6-function in MMR by recognizing mispaired bases. To determine the effect of MMR on single-base pair mismatch...
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ژورنال
عنوان ژورنال: Molecular and Cellular Biology
سال: 2007
ISSN: 0270-7306,1098-5549
DOI: 10.1128/mcb.00855-07