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. 1994 Dec 11;22(24):5289–5295. doi: 10.1093/nar/22.24.5289

Identification of two mismatch-binding activities in protein extracts of Schizosaccharomyces pombe.

O Fleck 1, P Schär 1, J Kohli 1
PMCID: PMC332073  PMID: 7816618

Abstract

We have performed band-shift assays to identify mismatch-binding proteins in cell extracts of Schizosaccharomyces pombe. By testing heteroduplex DNA containing either a T/G or a C/C mismatch, two distinct band shifts were produced in the gels. A low mobility complex was observed with the T/G substrate, while a high mobility complex was present with C/C. Further analysis of the mismatch-binding specificities revealed that the T/G binding activity also binds to T/C, C/T, T/T, T/-, A/-, C/-, G/-, G/G, A/A, A/C, A/G, G/T, G/A, and C/A substrates with varying efficiencies, but not binds to C/C. The C/C binding activity efficiently binds to C/C, T/C, C/T, C/A, A/C, C/-, and weakly also to T/T, while all other mispairs are not recognized. Protein extracts of a mutant strain, defective in the mutS homologue swi4, displayed both mismatch-binding activities. Thus, swi4 does not encode for either one of the mismatch-binding proteins.

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