A nucleic acid sequence is provided, encoding at least one of a precursor of a lariat peptide, a processing factor of a lariat peptide, and an export factor of a lariat peptide, wherein the lariat peptide is a non-MccJ25 lariat peptide according to general structural formula (I) Also provided are biosynthesis systems useful for the synthesis of peptides according to formula (I), and methods of detecting and identifying nucleic acid sequences encoding the disclosed proteins.
