Evidence that the DNA mismatch repair system removes 1-nucleotide Okazaki fragment flaps.
The DNA mismatch repair (MMR) system plays a major role in promoting genome stability and suppressing carcinogenesis. In this work, we investigated whether the MMR system is involved in Okazaki fragment maturation. We found that in the yeast Saccharomyces cerevisiae, the MMR system and the flap endonuclease Rad27 act in ... overlapping pathways that protect the nuclear genome from 1-bp insertions. In addition, we determined that purified yeast and human MutSα proteins recognize 1-nucleotide DNA and RNA flaps. In reconstituted human systems, MutSα, proliferating cell nuclear antigen, and replication factor C activate MutLα endonuclease to remove the flaps. ATPase and endonuclease mutants of MutLα are defective in the flap removal. These results suggest that the MMR system contributes to the removal of 1-nucleotide Okazaki fragment flaps.
Mesh Terms:
DNA, DNA Mismatch Repair, DNA Mutational Analysis, DNA Repair Enzymes, DNA Replication, DNA, Circular, Flap Endonucleases, Fungal Proteins, Gene Deletion, Genome, Humans, MutS DNA Mismatch-Binding Protein, Mutation, Ploidies, Proliferating Cell Nuclear Antigen, Protein Structure, Tertiary, Replication Protein C, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Substrate Specificity
DNA, DNA Mismatch Repair, DNA Mutational Analysis, DNA Repair Enzymes, DNA Replication, DNA, Circular, Flap Endonucleases, Fungal Proteins, Gene Deletion, Genome, Humans, MutS DNA Mismatch-Binding Protein, Mutation, Ploidies, Proliferating Cell Nuclear Antigen, Protein Structure, Tertiary, Replication Protein C, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Substrate Specificity
J. Biol. Chem.
Date: Oct. 02, 2015
PubMed ID: 26224637
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