Molecular dissection of interactions between Rad51 and members of the recombination-repair group.

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.
Mesh Terms:
Amino Acid Sequence, Base Sequence, Binding Sites, DNA Primers, DNA Repair, DNA Repair Enzymes, DNA-Binding Proteins, Epistasis, Genetic, Fungal Proteins, Genes, Fungal, Methyl Methanesulfonate, Models, Molecular, Molecular Sequence Data, Mutation, Rad51 Recombinase, Rad52 DNA Repair and Recombination Protein, Recombination, Genetic, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Sequence Homology, Amino Acid, Temperature, Two-Hybrid System Techniques
Mol. Cell. Biol.
Date: Feb. 01, 2001
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