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J. Bacteriol., Mar 1996, 1258-1264, Vol 178, No. 5
T Kogoma, GW Cadwell, KG Barnard and T Asai
The PriA protein, a component of the phiX174-type primosome, was previously
shown to be essential for damage-inducible DNA replication in Escherichia
coli, termed inducible stable DNA replication. Here, we show that priA::kan
null mutants are defective in transductional and conjugational homologous
recombination and are hypersensitive to mitomycin C and gamma rays, which
cause double-strand breaks. The introduction of a plasmid carrying the
priA300 allele, which encodes a mutant PriA protein capable of catalyzing
the assembly of an active primosome but which is missing the
n'-pas-dependent ATPase, helicase, and translocase activities associated
with PriA, alleviates the defects of priA::kan mutants in homologous
recombination, double-strand break repair, and inducible stable DNA
replication. Furthermore, spa-47, which was isolated as a suppressor of the
broth sensitivity of priA::kan mutants, suppresses the Rec- and mitomycin C
sensitivity phenotypes of priA::kan mutants. The spa-47 suppressor mutation
maps within or very near dnaC. These results suggest that PriA-dependent
primosome assembly is crucial for both homologous recombination and
double-strand break repair and support the proposal that these processes in
E. coli involve extensive DNA replication.
Copyright © 1996, American Society for Microbiology
The DNA replication priming protein, PriA, is required for homologous recombination and double-strand break repair
Department of Cell Biology, University of New Mexico Health Sciences Center, Albuquerque 87131, USA.
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