title: Requirement of Nse1, a subunit of the Smc5-Smc6 complex, for Rad52-dependent postreplication repair of UV-damaged DNA in Saccharomyces cerevisiae.
abstract: In Saccharomyces cerevisiae, postreplication repair (PRR) of UV-damaged DNA occurs by a Rad6-Rad18- and an Mms2-Ubc13-Rad5-dependent pathway or by a Rad52-dependent pathway. The Rad5 DNA helicase activity is specialized for promoting replication fork regression and template switching; previously, we suggested a role for the Rad5-dependent PRR pathway when the lesion is located on the leading strand and a role for the Rad52 pathway when the lesion is located on the lagging strand. In this study, we present evidence for the requirement of Nse1, a subunit of the Smc5-Smc6 complex, in Rad52-dependent PRR, and our genetic analyses suggest a role for the Nse1 and Mms21 E3 ligase activities associated with this complex in this repair mode. We discuss the possible ways by which the Smc5-Smc6 complex, including its associated ubiquitin ligase and SUMO ligase activities, might contribute to the Rad52-dependent nonrecombinational and recombinational modes of PRR.
authors.affiliation: Department of Biochemistry and Molecular Biology, University of Texas Medical Branch at Galveston, 301 University Blvd., Galveston, TX 77555-1061, USA.
authors.forename: Sergio R
authors.initials: SR
authors.lastname: Santa Maria
authors.forename: Venkateswarlu
authors.initials: V
authors.lastname: Gangavarapu
authors.forename: Robert E
authors.initials: RE
authors.lastname: Johnson
authors.forename: Louise
authors.initials: L
authors.lastname: Prakash
authors.forename: Satya
authors.initials: S
authors.lastname: Prakash
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D018797:Cell Cycle Proteins / Q000378:metabolism; D004249:DNA Damage; D004260:DNA Repair / Q000528:radiation effects; D004261:DNA Replication / Q000528:radiation effects; D004271:DNA, Fungal / Q000378:metabolism*; D004843:Epistasis, Genetic; D008969:Molecular Sequence Data; D050505:Mutant Proteins / Q000302:isolation & purification / Q000378:metabolism; D009154:Mutation / Q000235:genetics; D009687:Nuclear Proteins / Q000737:chemistry / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism; D021122:Protein Subunits / Q000378:metabolism*; D051721:Rad52 DNA Repair and Recombination Protein / Q000378:metabolism; D025842:SUMO-1 Protein / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000166:cytology / Q000201:enzymology / Q000528:radiation effects*; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000378:metabolism*; D044767:Ubiquitin-Protein Ligases / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D018797:Cell Cycle Proteins; D004271:DNA, Fungal; C500948:Mms21 protein, S cerevisiae; D050505:Mutant Proteins; C460369:NSE1 protein, S cerevisiae; D009687:Nuclear Proteins; D018809:Proliferating Cell Nuclear Antigen; D021122:Protein Subunits; C497197:RAD52 protein, S cerevisiae; D051721:Rad52 DNA Repair and Recombination Protein; C486627:SMC5 protein, S cerevisiae; C486631:SMC6 protein, S cerevisiae; D025842:SUMO-1 Protein; D029701:Saccharomyces cerevisiae Proteins; D044767:Ubiquitin-Protein Ligases