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. 1988 Jun;170(6):2427–2432. doi: 10.1128/jb.170.6.2427-2432.1988

Conservation of an ATP-binding domain among RecA proteins from Proteus vulgaris, Erwinia carotovora, Shigella flexneri, and Escherichia coli K-12 and B/r.

K L Knight 1, R M Hess 1, K McEntee 1
PMCID: PMC211151  PMID: 3286605

Abstract

The purified RecA proteins encoded by the cloned genes from Proteus vulgaris, Erwinia carotovora, Shigella flexneri, and Escherichia coli B/r were compared with the RecA protein from E. coli K-12. Each of the proteins hydrolyzed ATP in the presence of single-stranded DNA, and each was covalently modified with the photoaffinity ATP analog 8-azidoadenosine 5'-triphosphate (8N3ATP). Two-dimensional tryptic maps of the four heterologous RecA proteins demonstrated considerable structural conservation among these bacterial genera. Moreover, when the [alpha-32P]8N3ATP-modified proteins were digested with trypsin and analyzed by high-performance liquid chromatography, a single peak of radioactivity was detected in each of the digests and these peptides eluted identically with the tryptic peptide T31 of the E. coli K-12 RecA protein, which was the unique site of 8N3ATP photolabeling. Each of the heterologous recA genes hybridized to oligonucleotide probes derived from the ATP-binding domain sequence of the E. coli K-12 gene. These last results demonstrate that the ATP-binding domain of the RecA protein has been strongly conserved for greater than 10(7) years.

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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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