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. 1991 Sep 11;19(17):4761–4766. doi: 10.1093/nar/19.17.4761

Base mismatch-specific endonuclease activity in extracts from Saccharomyces cerevisiae.

D Y Chang 1, A L Lu 1
PMCID: PMC328720  PMID: 1891366

Abstract

An endonuclease activity (called MS-nicking) for all possible base mismatches has been detected in the extracts of yeast, Saccharomyces cerevisiae. DNAs with twelve possible base mismatches at one defined position are cleaved at different efficiencies. DNA fragments with A/G, G/A, T/G, G/T, G/G, or A/A mismatches are nicked with greater efficiencies than C/T, T/C, C/A, and C/C. DNA with an A/C or T/T mismatch is nicked with an intermediate efficiency. The MS-nicking is only on one particular DNA strand, and this strand disparity is not controlled by methylation, strand break, or nature of the mismatch. The nicks have been mapped at 2-3 places at second, third, and fourth phosphodiester bonds 5' to the mispaired base; from the time course study, the fourth phosphodiester bond probably is the primary incision site. This activity may be involved in mismatch repair during genetic recombination.

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