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- W2002018134 abstract "Bacterial MutS homodimers contain two ATPase active sites that have non-equivalent functions in DNA mismatch repair. The homologous Msh2-Msh6 complex in eukaryotes also has intrinsic ATPase activity that is essential for mismatch repair. Here, we investigate differences in the two putative ATPase active sites by examining the properties of heterodimers containing alanine substituted for an invariant glutamic acid in the active site of either Msh2, Msh6 or both. Mutation rates in wild type versus Glu-->Ala mutant haploid yeast strains indicate that both ATPase active sites are essential for mismatch repair activity in vivo. The properties of purified heterodimers suggest that the ATPase active site in Msh6 binds ATP with higher affinity and hydrolyzes ATP faster and with higher efficiency than does the ATPase active site in Msh2. This suggests sequential action of the two ATPase active sites, in which ATP binds to Msh6 first to trigger downstream events in mismatch repair." @default.
- W2002018134 created "2016-06-24" @default.
- W2002018134 creator A5011077525 @default.
- W2002018134 date "2002-09-04" @default.
- W2002018134 modified "2023-10-17" @default.
- W2002018134 title "Evidence for sequential action of two ATPase active sites in yeast Msh2–Msh6" @default.
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- W2002018134 doi "https://doi.org/10.1016/s1568-7864(02)00081-2" @default.
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