title: Nucleotide sequence and LexA regulation of the Escherichia coli recN gene.
abstract: The nucleotide sequence of a 2224 bp region of the Escherichia coli chromosome that carries the LexA regulated recN gene has been determined. A region of 1701 nucleotides encoding a polypeptide of 567 amino acids with a predicted molecular weight of 63,599 was identified as the most probable sequence for the recN structural gene. The proposed initiation codon is preceded by a reasonable Shine-Dalgarno sequence and a promoter region containing two 16 bp sequences, separated by 6 bp, that match the consensus sequence (SOS box) for binding LexA protein. DNA fragments containing this putative promoter region are shown to bind LexA in vitro and to have LexA-regulated promoter activity in vivo. The amino acid sequence of RecN predicted from the DNA contains a region that is homologous to highly conserved sequences found in several DNA repair enzymes and other proteins that bind ATP. A sequence of 9 amino acids was found to be homologous to a region of the RecA protein of E. coli postulated to have a role in DNA/nucleotide binding.
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism*; D001483:Base Sequence; D002876:Chromosomes, Bacterial / Q000502:physiology; D004260:DNA Repair; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000235:genetics*; D005796:Genes; D005798:Genes, Bacterial; D012097:Repressor Proteins / Q000378:metabolism*; D012689:Sequence Homology, Nucleic Acid; D012697:Serine Endopeptidases; D014157:Transcription Factors / Q000378:metabolism*; D000099160:LexA Repressor Protein
chemical_list: D001426:Bacterial Proteins; D004262:DNA Restriction Enzymes; D012097:Repressor Proteins; D012697:Serine Endopeptidases; D014157:Transcription Factors; D000099160:LexA Repressor Protein; C047879:RecN protein, Bacteria