title: Rad54p is a chromatin remodeling enzyme required for heteroduplex DNA joint formation with chromatin.
abstract: In eukaryotic cells, the repair of DNA double-strand breaks by homologous recombination requires a RecA-like recombinase, Rad51p, and a Swi2p/Snf2p-like ATPase, Rad54p. Here we find that yeast Rad51p and Rad54p support robust homologous pairing between single-stranded DNA and a chromatin donor. In contrast, bacterial RecA is incapable of catalyzing homologous pairing with a chromatin donor. We also show that Rad54p possesses many of the biochemical properties of bona fide ATP-dependent chromatin-remodeling enzymes, such as ySWI/SNF. Rad54p can enhance the accessibility of DNA within nucleosomal arrays, but it does not seem to disrupt nucleosome positioning. Taken together, our results indicate that Rad54p is a chromatin-remodeling enzyme that promotes homologous DNA pairing events within the context of chromatin.
authors.affiliation: Interdisciplinary Graduate Program and Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts 01605, USA.
authors.forename: Mariela
authors.initials: M
authors.lastname: Jaskelioff
authors.forename: Stephen
authors.initials: S
authors.lastname: Van Komen
authors.forename: Jocelyn E
authors.initials: JE
authors.lastname: Krebs
authors.forename: Patrick
authors.initials: P
authors.lastname: Sung
authors.forename: Craig L
authors.initials: CL
authors.lastname: Peterson
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D002843:Chromatin / Q000737:chemistry* / Q000378:metabolism*; D004247:DNA / Q000378:metabolism; D004265:DNA Helicases; D045643:DNA Repair Enzymes; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism; D005656:Fungal Proteins / Q000378:metabolism; D009687:Nuclear Proteins; D009690:Nucleic Acid Conformation; D009692:Nucleic Acid Heteroduplexes / Q000737:chemistry*; D009707:Nucleosomes / Q000378:metabolism; D011485:Protein Binding; D051135:Rad51 Recombinase; D011938:Rec A Recombinases / Q000378:metabolism; D011995:Recombination, Genetic; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry / Q000502:physiology*; D013696:Temperature; D013997:Time Factors; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D002843:Chromatin; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D009687:Nuclear Proteins; D009692:Nucleic Acid Heteroduplexes; D009707:Nucleosomes; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; C051802:triplex DNA; D000255:Adenosine Triphosphate; D004247:DNA; D051135:Rad51 Recombinase; D011938:Rec A Recombinases; D000251:Adenosine Triphosphatases; C075468:RAD54 protein, S cerevisiae; D004265:DNA Helicases; D045643:DNA Repair Enzymes