title: The Proliferating Cell Nuclear Antigen (PCNA)-interacting Protein (PIP) Motif of DNA Polymerase η Mediates Its Interaction with the C-terminal Domain of Rev1.
abstract: Y-family DNA polymerases, such as polymerase η, polymerase ι, and polymerase κ, catalyze the bypass of DNA damage during translesion synthesis. These enzymes are recruited to sites of DNA damage by interacting with the essential replication accessory protein proliferating cell nuclear antigen (PCNA) and the scaffold protein Rev1. In most Y-family polymerases, these interactions are mediated by one or more conserved PCNA-interacting protein (PIP) motifs that bind in a hydrophobic pocket on the front side of PCNA as well as by conserved Rev1-interacting region (RIR) motifs that bind in a hydrophobic pocket on the C-terminal domain of Rev1. Yeast polymerase η, a prototypical translesion synthesis polymerase, binds both PCNA and Rev1. It possesses a single PIP motif but not an RIR motif. Here we show that the PIP motif of yeast polymerase η mediates its interactions both with PCNA and with Rev1. Moreover, the PIP motif of polymerase η binds in the hydrophobic pocket on the Rev1 C-terminal domain. We also show that the RIR motif of human polymerase κ and the PIP motif of yeast Msh6 bind both PCNA and Rev1. Overall, these findings demonstrate that PIP motifs and RIR motifs have overlapping specificities and can interact with both PCNA and Rev1 in structurally similar ways. These findings also suggest that PIP motifs are a more versatile protein interaction motif than previously believed.
authors.affiliation: From the Departments of Biochemistry and.
authors.forename: Elizabeth M
authors.initials: EM
authors.lastname: Boehm
authors.affiliation: From the Departments of Biochemistry and.
authors.forename: Kyle T
authors.initials: KT
authors.lastname: Powers
authors.affiliation: From the Departments of Biochemistry and.
authors.forename: Christine M
authors.initials: CM
authors.lastname: Kondratick
authors.affiliation: From the Departments of Biochemistry and.
authors.forename: Maria
authors.initials: M
authors.lastname: Spies
authors.affiliation: Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa 52242.
authors.forename: Jon C D
authors.initials: JC
authors.lastname: Houtman
authors.affiliation: From the Departments of Biochemistry and todd-washington@uiowa.edu.
authors.forename: M Todd
authors.initials: MT
authors.lastname: Washington
mesh_terms: D020816:Amino Acid Motifs; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism; D004259:DNA-Directed DNA Polymerase / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D009687:Nuclear Proteins / Q000235:genetics / Q000378:metabolism*; D009713:Nucleotidyltransferases / Q000235:genetics / Q000378:metabolism*; D018809:Proliferating Cell Nuclear Antigen / Q000235:genetics / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D000099270:Y-Family DNA Polymerases
chemical_list: D004268:DNA-Binding Proteins; D004259:DNA-Directed DNA Polymerase; D009687:Nuclear Proteins; D009713:Nucleotidyltransferases; D018809:Proliferating Cell Nuclear Antigen; D029701:Saccharomyces cerevisiae Proteins; C094443:G-T mismatch-binding protein; C098790:MSH6 protein, S cerevisiae; C100951:REV1 protein, S cerevisiae; D000099270:Y-Family DNA Polymerases; C429004:REV1 protein, human; C546205:POLN protein, human
keywords: DNA damage; DNA polymerase; DNA repair; DNA replication; mutagenesis; translesion synthesis