title: ATP-dependent chromatin remodeling by the Saccharomyces cerevisiae homologous recombination factor Rdh54.
abstract: Saccharomyces cerevisiae RDH54 is a key member of the evolutionarily conserved RAD52 epistasis group of genes needed for homologous recombination and DNA double strand break repair. The RDH54-encoded protein possesses a DNA translocase activity and functions together with the Rad51 recombinase in the D-loop reaction. By chromatin immunoprecipitation (ChIP), we show that Rdh54 is recruited, in a manner that is dependent on Rad51 and Rad52, to a site-specific DNA double strand break induced by the HO endonuclease. Because of its relatedness to Swi2/Snf2 chromatin remodelers, we have asked whether highly purified Rdh54 possesses chromatin-remodeling activity. Importantly, our results show that Rdh54 can mobilize a mononucleosome along DNA and render nucleosomal DNA accessible to a restriction enzyme, indicative of a chromatin-remodeling function. Moreover, Rdh54 co-operates with Rad51 in the utilization of naked or chromatinized DNA as template for D-loop formation. We also provide evidence for a strict dependence of the chromatin-remodeling attributes of Rdh54 on its ATPase activity and N-terminal domain. Interestingly, an N-terminal deletion mutant (rdh54Delta102) is unable to promote Rad51-mediated D-loop formation with a chromatinized template, while retaining substantial activity with naked DNA. These features of Rdh54 suggest a role of this protein factor in chromatin rearrangement during DNA recombination and repair.
authors.affiliation: Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, Connecticut 06520, USA.
authors.forename: YoungHo
authors.initials: Y
authors.lastname: Kwon
authors.forename: Changhyun
authors.initials: C
authors.lastname: Seong
authors.forename: Peter
authors.initials: P
authors.lastname: Chi
authors.forename: Eric C
authors.initials: EC
authors.lastname: Greene
authors.forename: Hannah
authors.initials: H
authors.lastname: Klein
authors.forename: Patrick
authors.initials: P
authors.lastname: Sung
mesh_terms: D000251:Adenosine Triphosphatases / Q000737:chemistry; D000255:Adenosine Triphosphate / Q000378:metabolism*; D002843:Chromatin / Q000737:chemistry / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D004265:DNA Helicases; D004260:DNA Repair; D045643:DNA Repair Enzymes; D026942:DNA Topoisomerases; D017353:Gene Deletion; D015966:Gene Expression Regulation, Fungal; D008954:Models, Biological; D009154:Mutation; D009707:Nucleosomes / Q000378:metabolism; D017434:Protein Structure, Tertiary; D051135:Rad51 Recombinase / Q000378:metabolism; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000378:metabolism*
chemical_list: D002843:Chromatin; D009707:Nucleosomes; D029701:Saccharomyces cerevisiae Proteins; D000255:Adenosine Triphosphate; D004247:DNA; C495151:RAD51 protein, S cerevisiae; D051135:Rad51 Recombinase; D000251:Adenosine Triphosphatases; C075468:RAD54 protein, S cerevisiae; D004265:DNA Helicases; D026942:DNA Topoisomerases; C541336:RDH54 protein, S cerevisiae; D045643:DNA Repair Enzymes