LICHENICIDIN VK21 A2 IS A LANTIBIOTIC. THE LANTIBIOTICS ARE ARE CHARACTERIZED BY THIOESTER AMINO ACIDS LANTHIONINE AND/OR METHYLLANTHIONINE. HERE, LICHENICIDIN VK21 IS REPRESENTED BY THE SEQUENCE (SEQRES)
LICHENICIDIN VK21 IS A TETRACYCLIC PEPTIDE. POST TRANSLATIONAL MATURATION OF LANTIBIOTICS INVOLVES THE ENZYMIC CONVERSION OF THR, AND SER INTO DEHYDRATED AMINO ACIDS AND THE FORMATION OF THIOETHER BONDS WITH CYSTEINE. THIOETHER BONDS WITH CYSTEINE RESULT IN FOUR RINGS. THIS IS FOLLOWED BY MEMBRANE TRANSLOCATION AND CLEAVAGE OF THE MODIFIED PRECURSOR.