The enzyme, isolated from the bacterium Streptomyces sp. OH-4156, can methylate a variety of oligopeptides, cyclic peptides such as nisin and haloduracin, and the ¦Å-amino group of lysine [2]. Cypemycin is a peptide antibiotic, a member of the linaridins, a class of posttranslationally modified ribosomally synthesized peptides.