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Oxidized Msh2-Msh6 L1129C/S1137C is trapped in the nucleotide-free conformation. Four μg of reduced or oxidized wild-type Msh2-Msh6 or reduced, oxidized, or ATP-supplemented oxidized Msh2-Msh6 L1129C/S1137C were incubated with 50–200 ng of trypsin with or without 100 μm ATPγS. The proteolysis products were separated by SDS-PAGE on a 4–15% gel, and the gel was silver stained. Only the portion of the gels containing the 70–100-kDa size range is shown.
