Reference: Li L, et al. (2005) Sensitivity to phosphonoacetic acid: a new phenotype to probe DNA polymerase delta in Saccharomyces cerevisiae. Genetics 170(2):569-80

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Abstract


A mutant allele (pol3-L612M) of the DNA polymerase delta gene in Saccharomyces cerevisiae that confers sensitivity to the antiviral drug phosphonoacetic acid (PAA) was constructed. We report that PAA-sensitivity tagging DNA polymerases is a useful method for selectively and reversibly inhibiting one type of DNA polymerase. Our initial studies reveal that replication by the L612M-DNA pol delta requires Rad27 flap endonuclease activity since the pol3-L612M strain is not viable in the absence of RAD27 function. The L612M-DNA pol delta also strongly depends on mismatch repair (MMR). Reduced viability is observed in the absence of any of the core MMR proteins-Msh2, Mlh1, or Pms1-and severe sensitivity to PAA is observed in the absence of the core proteins Msh6 or Exo1, but not Msh3. We propose that pol3-L612M cells need the Rad27 flap endonuclease and MMR complexes composed of Msh2/Msh6, Mlh1/Pms1, and Exo1 for correct processing of Okazaki fragments.

Reference Type
Journal Article | Research Support, U.S. Gov't, Non-P.H.S.
Authors
Li L, Murphy KM, Kanevets U, Reha-Krantz LJ
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