| Summary: | The members of the genus Bacillus produce a wide variety of secondary metabolites with antimetabolic and pharmacological activities. Most of these metabolites are small peptides that have unusual components and chemical bonds and synthesized nonribosomally by multifunctional enzyme complexes called peptide synthetases. Bacilysin, being produced and excreted by certain strains of Bacillus subtilis, is one of the simplest peptide antibiotics known. It is a dipeptide with an N-terminal L-alanine and an unusual amino acid, L-anticapsin, at its C-terminal. Recently, ywfBCDEF operon of B. subtilis 168 was shown to carry bacilysin biosynthesis function, the genes of this operon were renamed as bacABCDE. The first member of bac operon, bacA gene was proved to encode the function of L-alanine &ndash === L-anticapsin amino acid ligation. Bacilysin production is regulated at different levels, negatively by GTP via the transcriptional regulator CodY and AbrB while positive regulation occurs by guanosine 5
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