PMID:10498723

Citation	Sutera, VA Jr, Han, ES, Rajman, LA and Lovett, ST (1999) Mutational analysis of the RecJ exonuclease of Escherichia coli: identification of phosphoesterase motifs. J. Bacteriol. 181:6098-102
Abstract	The recJ gene, identified in Escherichia coli, encodes a Mg(+2)-dependent 5'-to-3' exonuclease with high specificity for single-strand DNA. Genetic and biochemical experiments implicate RecJ exonuclease in homologous recombination, base excision, and methyl-directed mismatch repair. Genes encoding proteins with strong similarities to RecJ have been found in every eubacterial genome sequenced to date, with the exception of Mycoplasma and Mycobacterium tuberculosis. Multiple genes encoding proteins similar to RecJ are found in some eubacteria, including Bacillus and Helicobacter, and in the archaea. Among this divergent set of sequences, seven conserved motifs emerge. We demonstrate here that amino acids within six of these motifs are essential for both the biochemical and genetic functions of E. coli RecJ. These motifs may define interactions with Mg(2+) ions or substrate DNA. A large family of proteins more distantly related to RecJ is present in archaea, eubacteria, and eukaryotes, including a hypothetical protein in the MgPa adhesin operon of Mycoplasma, a domain of putative polyA polymerases in Synechocystis and Aquifex, PRUNE of Drosophila, and an exopolyphosphatase (PPX1) of Saccharomyces cereviseae. Because these six RecJ motifs are shared between exonucleases and exopolyphosphatases, they may constitute an ancient phosphoesterase domain now found in all kingdoms of life.
Links	PubMed PMC103638
Keywords	Amino Acid Sequence; Bacterial Proteins/genetics; DNA Mutational Analysis; DNA Repair; Escherichia coli/enzymology; Escherichia coli Proteins; Esterases; Exodeoxyribonucleases/genetics; Gene Dosage; Genes, Bacterial; Molecular Sequence Data; Recombination, Genetic; Sequence Homology, Amino Acid
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
9CAUD:A0A0K2D0I8		GO:0004309: exopolyphosphatase activity	ECO:0000315:		F		Multiple genes encoding proteins similar to RecJ are found in eubacteria (Bacillus). Mutant deficient in RecJ nuclease show recombination deficiency.	complete CACAO 11598

References

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