Interaction of Escherichia coli RecA protein with LexA repressor. II. Inhibition of DNA strand exchange by the uncleavable LexA S119A repressor argues that recombination and SOS induction are competitive processes

Frank G. Harmon, William M. Rehrauer, Stephen C. Kowalczykowski

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

The Escherichia coli RecA protein is involved in SOS induction, DNA repair, and homologous recombination. In vitro, RecA protein serves as a co- protease to cleave LexA repressor, the repressor of the SOS regulon; in addition, RecA protein promotes homologous pairing and DNA strand exchange, steps important to homologous recombination and DNA repair. To determine if these two functions of RecA protein are competing or parallel, the effect of uncleavable LexA S119A repressor on RecA protein-dependent activities was examined. LexA S119A repressor inhibits both the single-stranded DNA (ssDNA)- dependent ATP hydrolysis and DNA strand exchange activities of RecA protein. As for wild-type LexA repressor (Rehrauer, W. M., Lavery, P. E., Palmer, E. L., Singh, R. N., and Kowalczykowski, S.C. (1996) J. Biol Chem. 271, 23865- 23873), inhibition of ATP hydrolysis is dependent upon the presence of E. coli single-stranded DNA binding (SSB) protein, arguing that LexA repressor affects the competition between RecA protein and SSB protein for ssDNA binding sites. In contrast, inhibition of DNA strand exchange activity is SSB protein-independent, suggesting that LexA S119A represser blocks a site required for DNA strand exchange. These results imply that there is a common site on the RecA protein filament for secondary DNA and LexA repressor binding and raise the possibility that the recombination and co-protease activities of the RecA protein filament are competitive.

Original languageEnglish (US)
Pages (from-to)23874-23883
Number of pages10
JournalJournal of Biological Chemistry
Volume271
Issue number39
DOIs
StatePublished - 1996

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Rec A Recombinases
Escherichia coli Proteins
Escherichia coli
Genetic Recombination
DNA
DNA-Binding Proteins
Recombinational DNA Repair
Single-Stranded DNA
Hydrolysis
Repair
Peptide Hydrolases
Adenosine Triphosphate
Regulon
Binding Sites

ASJC Scopus subject areas

  • Biochemistry

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Interaction of Escherichia coli RecA protein with LexA repressor. II. Inhibition of DNA strand exchange by the uncleavable LexA S119A repressor argues that recombination and SOS induction are competitive processes. / Harmon, Frank G.; Rehrauer, William M.; Kowalczykowski, Stephen C.

In: Journal of Biological Chemistry, Vol. 271, No. 39, 1996, p. 23874-23883.

Research output: Contribution to journalArticle

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