title: Terminal association of Rad54 protein with the Rad51-dsDNA filament.
abstract: Rad54 protein is a Snf2-related dsDNA-specific ATPase essential for homologous recombination mediated by Rad51 protein, the eukaryotic RecA ortholog. Snf2-related enzymes couple ATP hydrolysis with translocation on dsDNA to remodel or dissociate a wide variety of protein-dsDNA complexes. Rad54 and Rad51 interact through species-specific contacts and mutually stimulate their biochemical activities. Specifically, Rad51 bound to dsDNA, the product of homologous recombination after DNA-strand exchange, stimulates the Rad54 ATPase up to 6-fold, leading to the turnover of Rad51 in the product complex. Electron microscopy visualized the Rad51-Rad54 interaction on dsDNA, showing that an oligomeric form of Rad54 associates preferentially with termini of the Rad51-dsDNA filament. Our data support a mechanism of processive dsDNA-Rad51 filament dissociation by the translocating Rad54 protein.
authors.affiliation: Sections of Microbiology and Molecular and Cellular Biology, Center for Genetics and Development, University of California-Davis, Davis, CA 95616-8665.
authors.forename: Konstantin
authors.initials: K
authors.lastname: Kiianitsa
authors.forename: Jachen A
authors.initials: JA
authors.lastname: Solinger
authors.forename: Wolf-Dietrich
authors.initials: WD
authors.lastname: Heyer
mesh_terms: D000251:Adenosine Triphosphatases; D004247:DNA / Q000737:chemistry / Q000378:metabolism; D004265:DNA Helicases; D045643:DNA Repair Enzymes; D004268:DNA-Binding Proteins / Q000737:chemistry; D008854:Microscopy, Electron; D025941:Protein Interaction Mapping; D021381:Protein Transport; D051135:Rad51 Recombinase / Q000737:chemistry* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000737:chemistry* / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry
chemical_list: D004268:DNA-Binding Proteins; D029701:Saccharomyces cerevisiae Proteins; D014157:Transcription Factors; D004247:DNA; D051135:Rad51 Recombinase; D000251:Adenosine Triphosphatases; C075468:RAD54 protein, S cerevisiae; C499333:SNF2 protein, S cerevisiae; D004265:DNA Helicases; D045643:DNA Repair Enzymes