Lanthionine-containing peptide that does probably not show antibacterial activity, since its analog [+7]Flvbeta.f does not show antibacterial activity against M.luteus (PubMed:27028884). Also does not show antibiotic activity when tested with [Del2]Flvalpha.a, an analog of Flvalpha.a, which is encoded by the same operon than Flvbeta.f (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 DL-beta-methyllanthionine, when coepressed in E.coli with the flavecin synthetase FlvM2.