Reference: Haracska L, et al. (2002) Yeast Rev1 protein is a G template-specific DNA polymerase. J Biol Chem 277(18):15546-51

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Abstract


Rev1 protein of Saccharomyces cerevisiae functions with DNA polymerase zeta in mutagenic trans-lesion synthesis. Because of the reported preferential incorporation of a C residue opposite an abasic site, Rev1 has been referred to as a deoxycytidyltransferase. Here, we use steady-state kinetics to examine nucleotide incorporation by Rev1 opposite undamaged and damaged template residues. We show that Rev1 specifically inserts a C residue opposite template G, and it is approximately 25-, 40-, and 400-fold less efficient at inserting a C residue opposite an abasic site, an O(6)-methylguanine, and an 8-oxoguanine lesion, respectively. Rev1 misincorporates G, A, and T residues opposite template G with a frequency of approximately 10(-3) to 10(-4). Consistent with this finding, Rev1 replicates DNA containing a string of Gs in a template-specific manner, but it has a low processivity incorporating 1.6 nucleotides per DNA binding event on the average. From these observations, we infer that Rev1 is a G template-specific DNA polymerase.

Reference Type
Journal Article | Research Support, U.S. Gov't, P.H.S.
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Haracska L, Prakash S, Prakash L
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