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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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MSH2 and MSH6 are required for removal of adenine misincorporated opposite 8-oxo-guanine in S. cerevisiae.

Oxidation of G in DNA yields 8-oxo-G (GO), a mutagenic lesion that leads to misincorporation of A opposite GO. In E. coli, GO in GO:C base pairs is removed by MutM, and A in GO:A mispairs is removed by MutY. In S. cerevisiae, mutations in MSH2 or MSH6 caused a synergistic increase in mutation rate in combination with mutations in OGG1, which encodes a MutM homolog, resulting in a 140- to 218-fold increase in the G:C-to-T:A transversion rate. Consistent with this, MSH2-MSH6 complex bound to GO:A mispairs and GO:C base pairs with high affinity and specificity. These data indicate that in S. cerevisiae, MSH2-MSH6-dependent mismatch repair is the major mechanism by which misincorporation of A opposite GO is corrected.[1]

References

  1. MSH2 and MSH6 are required for removal of adenine misincorporated opposite 8-oxo-guanine in S. cerevisiae. Ni, T.T., Marsischky, G.T., Kolodner, R.D. Mol. Cell (1999) [Pubmed]
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