title: Rad54 protein possesses chromatin-remodeling activity stimulated by the Rad51-ssDNA nucleoprotein filament.
abstract: In Saccharomyces cerevisiae, the Rad54 protein participates in the recombinational repair of double-strand DNA breaks together with the Rad51, Rad52, Rad55 and Rad57 proteins. In vitro, Rad54 interacts with Rad51 and stimulates DNA strand exchange promoted by Rad51 protein. Rad54 is a SWI2/SNF2-related protein that possesses double-stranded DNA-dependent ATPase activity and changes DNA topology in an ATP hydrolysis-dependent manner. Here we show that Rad54 catalyzes bidirectional nucleosome redistribution by sliding nucleosomes along DNA. Nucleosome redistribution is greatly stimulated by the Rad51 nucleoprotein filament but does not require the presence of homologous single-stranded DNA within the filament. On the basis of these data, we propose that Rad54 facilitates chromatin remodeling and, perhaps more generally, protein clearing at the homology search step of genetic recombination.
authors.affiliation: Division of Biological Sciences, Center for Genetics and Development, University of California, Davis, California 95616-8665, USA.
authors.forename: Andrei
authors.initials: A
authors.lastname: Alexeev
authors.forename: Alexander
authors.initials: A
authors.lastname: Mazin
authors.forename: Stephen C
authors.initials: SC
authors.lastname: Kowalczykowski
mesh_terms: D008841:Actin Cytoskeleton / Q000378:metabolism; D001692:Biological Transport; D002843:Chromatin / Q000378:metabolism*; D004265:DNA Helicases; D004260:DNA Repair; D045643:DNA Repair Enzymes; D004277:DNA, Single-Stranded / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D008840:Microfilament Proteins / Q000378:metabolism; D009698:Nucleoproteins / Q000235:genetics / Q000378:metabolism*; D009707:Nucleosomes / Q000378:metabolism; D051135:Rad51 Recombinase; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*
chemical_list: D002843:Chromatin; D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins; D008840:Microfilament Proteins; D009698:Nucleoproteins; D009707:Nucleosomes; D029701:Saccharomyces cerevisiae Proteins; C495151:RAD51 protein, S cerevisiae; D051135:Rad51 Recombinase; C075468:RAD54 protein, S cerevisiae; D004265:DNA Helicases; D045643:DNA Repair Enzymes