The nucleotide sequence of the alr gene encoding the biosynthetic alanine racemase in Salmonella typhimurium is reported. The sequence was determined by the dideoxy chain termination method of Sanger mostly from recombinants derived from shotgun and specific subcloning of a 2.6-kilobase region containing the alr gene. The final bridging of nonoverlapping contiguous sequences was accomplished with the use of synthetic site-specific primers. The alr gene was found to be 1077 base pairs in length encoding a protein of 359 amino acid residues. Comparison of alr with the dadB gene encoding the catabolic alanine racemase in S. typhimurium revealed almost identical size (1077 vs. 1068 base pairs) and 52% sequence identity. The respective gene products displayed 43% homology, which includes a decapeptide bearing the pyridoxal 5'-phosphate binding site.
Alanine Racemase Amino Acid Isomerases