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• W2052442016 abstract "EXO1 interacts with MSH2 and MLH1 and has been proposed to be a redundant exonuclease that functions in mismatch repair (MMR). To better understand the role of EXO1 in mismatch repair, a genetic screen was performed to identify mutations that increase the mutation rates caused by weak mutator mutations such as exo1Delta and pms1-A130V mutations. In a screen starting with an exo1 mutation, exo1-dependent mutator mutations were obtained in MLH1, PMS1, MSH2, MSH3, POL30 (PCNA), POL32, and RNR1, whereas starting with the weak pms1 allele pms1-A130V, pms1-dependent mutator mutations were identified in MLH1, MSH2, MSH3, MSH6, and EXO1. These mutations only cause weak MMR defects as single mutants but cause strong MMR defects when combined with each other. Most of the mutations obtained caused amino acid substitutions in MLH1 or PMS1, and these clustered in either the ATP-binding region or the MLH1-PMS1 interaction regions of these proteins. The mutations showed two other types of interactions: specific pairs of mutations showed unlinked noncomplementation in diploid strains, and the defect caused by pairs of mutations could be suppressed by high-copy-number expression of a third gene, an effect that showed allele and overexpressed gene specificity. These results support a model in which EXO1 plays a structural role in MMR and stabilizes multiprotein complexes containing a number of MMR proteins. A similar role is proposed for PCNA based on the data presented." @default.
• W2052442016 created "2016-06-24" @default.
• W2052442016 creator A5028644757 @default.
• W2052442016 creator A5067222747 @default.
• W2052442016 creator A5067965123 @default.
• W2052442016 creator A5081915207 @default.
• W2052442016 date "2001-08-01" @default.
• W2052442016 modified "2023-10-14" @default.
• W2052442016 title "<i>exo1</i>-Dependent Mutator Mutations: Model System for Studying Functional Interactions in Mismatch Repair" @default.
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• W2052442016 doi "https://doi.org/10.1128/mcb.21.15.5142-5155.2001" @default.
• W2052442016 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/87239" @default.
• W2052442016 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11438669" @default.
• W2052442016 hasPublicationYear "2001" @default.
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