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. 1984 Oct;160(1):153–160. doi: 10.1128/jb.160.1.153-160.1984

Cloning and characterization of recA genes froM Proteus vulgaris, Erwinia carotovora, Shigella flexneri, and Escherichia coli B/r.

S L Keener, K P McNamee, K McEntee
PMCID: PMC214694  PMID: 6090408

Abstract

The recA genes of Proteus vulgaris, Erwinia carotovora, Shigella flexneri and Escherichia coli B/r have been isolated and introduced into Escherichia coli K-12. All the heterologous genes restore resistance to killing by UV irradiation and the mutagen 4-nitroquinoline-1-oxide in RecA- E. coli K-12 hosts. Recombination proficiency is also restored as measured by formation of Lac+ recombinants from duplicated mutant lacZ genes and the ability to propagate phage lambda derivatives requiring host recombination functions for growth (Fec-). The cloned heterologous genes increase the spontaneous induction of lambda prophage in lysogens of a recA strain. Addition of mitomycin C stimulates phage production in cells carrying the E. coli B/r and S. flexneri recA genes, but little or no stimulation is seen in cells carrying the E. carotovora and P. vulgaris recA genes. After treatment with nalidixic acid, the heterologous RecA proteins are synthesized at elevated levels, a result consistent with their regulation by the E. coli K-12 LexA repressor. Southern hybridization and preliminary restriction analysis indicate divergence among the coding sequences, but antibodies prepared against the E. coli K-12 RecA protein cross-react with the heterologous enzymes, indicating structural conservation among these proteins.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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