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National Institute of Environmental Health Sciences

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Publication Detail

Title: Yeast Rad55 and Rad57 proteins form a heterodimer that functions with replication protein A to promote DNA strand exchange by Rad51 recombinase.

Authors: Sung, P

Published In Genes Dev, (1997 May 01)

Abstract: Saccharomyces cerevisiae RAD51, RAD55, and RAD57 genes, required for genetic recombination and DNA double-strand-break repair, encode proteins homologous to one another and to the Escherichia coli RecA protein. Rad51 protein catalyzes the DNA strand-exchange reaction with a dependence on ATP and on the heterotrimeric single-strand DNA (ssDNA) binding factor replication protein A (RPA). By several independent criteria, RAD55- and RAD57-encoded products are shown here to exist as a stable heterodimer, with a dissociation constant of <2 x 10(-10) M. In strand exchange, the reaction proceeds efficiently if RPA is incorporated after nucleation of Rad51 onto ssDNA, but if RPA is present during the nucleation phase, as is likely the case in vivo, the amount of strand-exchange products becomes relatively insignificant. Inclusion of the Rad55-Rad57 heterodimer with Rad51 and RPA results in a marked stimulation of strand exchange, providing evidence for a role of the Rad55-Rad57 heterodimer in overcoming the inhibitory effect of RPA.

PubMed ID: 9159392 Exiting the NIEHS site

MeSH Terms: Adenosine Triphosphatases; DNA Nucleotidyltransferases/metabolism*; DNA Repair; DNA Repair Enzymes; DNA, Fungal/metabolism*; DNA, Single-Stranded/metabolism; DNA-Binding Proteins/metabolism*; Dimerization; Escherichia coli/genetics; Fungal Proteins/chemistry*; Fungal Proteins/genetics; Fungal Proteins/metabolism*; Genes, Fungal; Integrases*; Rad51 Recombinase; Rec A Recombinases/metabolism; Recombinases; Recombination, Genetic; Replication Protein A; Saccharomyces cerevisiae Proteins*; Saccharomyces cerevisiae/genetics; Saccharomyces cerevisiae/metabolism*

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