title: Molecular dissection of interactions between Rad51 and members of the recombination-repair group.
abstract: Recombination is important for the repair of DNA damage and for chromosome segregation during meiosis; it has also been shown to participate in the regulation of cell proliferation. In the yeast Saccharomyces cerevisiae, recombination requires products of the RAD52 epistasis group. The Rad51 protein associates with the Rad51, Rad52, Rad54, and Rad55 proteins to form a dynamic complex. We describe a new strategy to screen for mutations which cause specific disruption of the interaction between certain proteins in the complex, leaving other interactions intact. This approach defines distinct protein interaction domains and protein relationships within the Rad51 complex. Alignment of the mutations onto the constructed three-dimensional model of the Rad51 protein reveal possible partially overlapping interfaces for the Rad51-Rad52 and the Rad51-Rad54 interactions. Rad51-Rad55 and Rad51-Rad51 interactions are affected by the same spectrum of mutations, indicating similarity between the two modes of binding. Finally, the detection of a subset of mutations within Rad51 which disrupt the interaction with mutant Rad52 protein but activate the interaction with Rad54 suggests that dynamic changes within the Rad51 protein may contribute to an ordered reaction process.
authors.affiliation: Department of Analysis of Biologically Important Molecular Complexes, Masaryk University, 612 65 Brno, Czech Republic.
authors.forename: L
authors.initials: L
authors.lastname: Krejci
authors.forename: J
authors.initials: J
authors.lastname: Damborsky
authors.forename: B
authors.initials: B
authors.lastname: Thomsen
authors.forename: M
authors.initials: M
authors.lastname: Duno
authors.forename: C
authors.initials: C
authors.lastname: Bendixen
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D001665:Binding Sites; D004265:DNA Helicases; D017931:DNA Primers / Q000235:genetics; D004260:DNA Repair / Q000235:genetics*; D045643:DNA Repair Enzymes; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D004843:Epistasis, Genetic; D005656:Fungal Proteins / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism*; D005800:Genes, Fungal; D008741:Methyl Methanesulfonate / Q000633:toxicity; D008958:Models, Molecular; D008969:Molecular Sequence Data; D009154:Mutation; D051135:Rad51 Recombinase; D051721:Rad52 DNA Repair and Recombination Protein; D011995:Recombination, Genetic; D012441:Saccharomyces cerevisiae / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins; D017386:Sequence Homology, Amino Acid; D013696:Temperature; D020798:Two-Hybrid System Techniques
chemical_list: D017931:DNA Primers; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; C497197:RAD52 protein, S cerevisiae; C087191:RAD55 protein, S cerevisiae; D051721:Rad52 DNA Repair and Recombination Protein; D029701:Saccharomyces cerevisiae Proteins; D008741:Methyl Methanesulfonate; C495151:RAD51 protein, S cerevisiae; D051135:Rad51 Recombinase; C075468:RAD54 protein, S cerevisiae; D004265:DNA Helicases; D045643:DNA Repair Enzymes