title: Functional interaction of MutY homolog with proliferating cell nuclear antigen in fission yeast, Schizosaccharomyces pombe.
abstract: The MutY homolog (MYH) is responsible for removing adenines misincorporated on a template DNA strand containing G or 7,8-dihydro-8-oxoguanine (8-oxoG) and thus preventing G:C to T:A mutations. Human MYH has been shown to interact physically with human proliferating cell nuclear antigen (hPCNA). Here, we report that a similar interaction between SpMYH and SpPCNA occurs in the fission yeast Schizosaccharomyces pombe. Binding of SpMYH to SpPCNA was not observed when phenylalanine 444 in the PCNA binding motif of SpMYH was replaced with alanine. The F444A mutant of SpMYH expressed in yeast cells had normal adenine glycosylase and DNA binding activities. However, expression of this mutant form of SpMYH in a SpMYHDelta cell could not reduce the mutation frequency of the cell to the normal level. Moreover, SpMYH interacted with hPCNA, and SpPCNA interacted with hMYH but not with F518A/F519A mutant hMYH containing mutations in its PCNA binding motif. Although the SpMYHDelta cells expressing hMYH had partially reduced mutation frequency, the F518A/F519A mutant hMYH could not reduce the mutation frequency of SpMYHDelta cells. Thus, the interaction between SpMYH and SpPCNA is important for SpMYH biological function in mutation avoidance.
authors.affiliation: Department of Biochemistry and Molecular Biology, School of Medicine, University of Maryland, Baltimore, Maryland 21201, USA.
authors.forename: Dau-Yin
authors.initials: DY
authors.lastname: Chang
authors.forename: A-Lien
authors.initials: AL
authors.lastname: Lu
mesh_terms: D000409:Alanine / Q000737:chemistry; D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D004247:DNA / Q000378:metabolism; D045647:DNA Glycosylases; D004260:DNA Repair; D018076:DNA, Complementary / Q000378:metabolism; D005982:Glutathione Transferase / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009154:Mutation; D009699:N-Glycosyl Hydrolases / Q000737:chemistry* / Q000378:metabolism*; D009532:Nickel / Q000494:pharmacology; D010649:Phenylalanine / Q000737:chemistry; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism*; D011485:Protein Binding; D012333:RNA, Messenger / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D012568:Schizosaccharomyces / Q000378:metabolism*
chemical_list: D018076:DNA, Complementary; D018809:Proliferating Cell Nuclear Antigen; D012333:RNA, Messenger; D011993:Recombinant Fusion Proteins; D010649:Phenylalanine; D009532:Nickel; D004247:DNA; D005982:Glutathione Transferase; D045647:DNA Glycosylases; D009699:N-Glycosyl Hydrolases; C437225:adenine glycosylase; C061738:mutY adenine glycosylase; D000409:Alanine