Alanine--anticapsin ligase

UniProtKB accession:  P39641

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UniProtKB description:  Part of the bacABCDEFG operon responsible for the biosynthesis of bacilysin, an irreversible inactivator of the glutaminase domain of glucosamine synthetase. Catalyzes the formation of alpha-dipeptides from various L-amino acids in the presence of ATP. In vivo catalyzes the ligation of L-alanine and L-anticapsin (epoxycyclohexanonyl-Ala) to produce the final bacilysin antibiotic (L-Ala-L-4S-cyclohexenonyl-Ala dipeptide). The substrate specificity is restricted to small amino acids such as L-Ala, for the N-terminal end of the dipeptide, whereas a wide range of hydrophobic amino acids such as L-Phe, L-Tyr and L-Met are recognized for the C-terminal end.