title: Promotion of Rad51-dependent D-loop formation by yeast recombination factor Rdh54/Tid1.
abstract: The first DNA joint formed in homologous recombination processes is a D-loop. Saccharomyces cerevisiae RDH54/TID1-encoded product, a Swi2/Snf2-like factor involved in recombination, is shown here to promote D-loop formation with Rad51 recombinase. Physical interaction between Rdh54 and Rad51 is functionally important because Rdh54 does not enhance the recombinase activity of the Escherichia coli RecA protein. Robust dsDNA-activated ATPase activity in Rdh54 generates unconstrained negative and positive supercoils in DNA. Efficient D-loop formation occurs with even topologically relaxed DNA, suggesting that via specific protein-protein interactions, the negative supercoils produced by Rdh54 are used by Rad51 for making DNA joints.
authors.affiliation: Department of Molecular Medicine and Institute of Biotechnology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78245-3207, USA.
authors.forename: G
authors.initials: G
authors.lastname: Petukhova
authors.forename: P
authors.initials: P
authors.lastname: Sung
authors.forename: H
authors.initials: H
authors.lastname: Klein
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D004247:DNA / Q000378:metabolism; D004265:DNA Helicases; D045643:DNA Repair Enzymes; D026942:DNA Topoisomerases; D004264:DNA Topoisomerases, Type I / Q000378:metabolism; D004278:DNA, Superhelical / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D004587:Electrophoresis, Agar Gel; D015180:Electrophoresis, Gel, Two-Dimensional; D004926:Escherichia coli / Q000378:metabolism; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015966:Gene Expression Regulation, Fungal; D015151:Immunoblotting; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D051135:Rad51 Recombinase; D011938:Rec A Recombinases / Q000378:metabolism; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins; D013997:Time Factors
chemical_list: D004278:DNA, Superhelical; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D004247:DNA; C495151:RAD51 protein, S cerevisiae; D051135:Rad51 Recombinase; D011938:Rec A Recombinases; D000251:Adenosine Triphosphatases; C075468:RAD54 protein, S cerevisiae; D004265:DNA Helicases; D026942:DNA Topoisomerases; C541336:RDH54 protein, S cerevisiae; D004264:DNA Topoisomerases, Type I; D045643:DNA Repair Enzymes