Lanthionine-containing peptide antibiotic (lantibiotic) that is probably active on Gram-positive bacteria, since its analog [Del1]Flvbeta.e shows antibacterial activity against Gram-positive bacteria (PubMed:27028884). This activity is not synergistically enhanced by [Del2]Flvalpha.a, an analog of Flvalpha.a, which is encoded by the same operon than Flvbeta.e (PubMed:27028884). The bactericidal activity of lantibiotics is based on depolarization of energized bacterial cytoplasmic membranes, initiated by the formation of aqueous transmembrane pores (By similarity). Contains LL-lanthionine and DL-beta-methyllanthionine, when coepressed in E.coli with the flavecin synthetase FlvM2.