title: Competition between MutY and mismatch repair at A x C mispairs In vivo.
abstract: We show that the MutY protein competes with the MutS-dependent mismatch repair system to process at least some A. C mispairs in vivo, converting them to G. C pairs. In the presence of an increased dCTP pool resulting from the loss of nucleotide diphosphate kinase, the frequency of A. T-->G. C transitions at a hot spot in the rpoB gene is 30-fold lower in a MutY-deficient derivative than in the wild type.
authors.affiliation: Department of Microbiology, Immunology, and Molecular Genetics, University of California, Los Angeles, California 90095, USA.
authors.forename: Mandy
authors.initials: M
authors.lastname: Kim
authors.forename: Tiffany
authors.initials: T
authors.lastname: Huang
authors.forename: Jeffrey H
authors.initials: JH
authors.lastname: Miller
mesh_terms: D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins; D020137:Base Pair Mismatch; D045647:DNA Glycosylases; D004260:DNA Repair; D004268:DNA-Binding Proteins; D012321:DNA-Directed RNA Polymerases / Q000235:genetics / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism; D051719:MutS DNA Mismatch-Binding Protein; D009154:Mutation; D009699:N-Glycosyl Hydrolases / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D012321:DNA-Directed RNA Polymerases; C105078:RNA polymerase beta subunit; D045647:DNA Glycosylases; D009699:N-Glycosyl Hydrolases; C061738:mutY adenine glycosylase; D000251:Adenosine Triphosphatases; D051719:MutS DNA Mismatch-Binding Protein; C497175:MutS protein, E coli