Lanthionine-containing peptide that does probably not show antibacterial activity, since its analog [+2]Flvbeta.d 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.d (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, DL-lanthionine, and DL-beta-methyllanthionine, when coepressed in E.coli with the flavecin synthetase FlvM2.