Wikipedia - Cinnamycin: Cinnamycin is a tetracyclic antibacterial peptide produced by Streptomyces cinnamoneus containing 19 amino acid residues including the unusual amino acids threo-3-methyl-lanthionine, meso-lanthionine, lysinoalanine, and 3-hydroxyaspartic acid.
Cinnamycin belongs to the class of molecules known as lantibiotics which belongs to ribosomally synthesized post-translationally modified peptides. The unique receptor for cinnamycin is phosphatidylethanolamine (PE) lipids which is a major compound present in many bacterial cell membranes.
Cinnamycin was first isolated in 1952 and some other compounds with similar sequence and structure were found later.
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BIRD information
Type
Polypeptide / Lantibiotic
Details
CINNAMYCIN IS A GLOBULAR TYPE B LANTIBIOTIC. THE LANTIBIOTICS ARE CHARACTERIZED BY THIOESTER AMINO ACIDS LANTHIONINE AND/OR METHYLLANTHIONINE. HERE, CINNAMYCIN IS REPRESENTED BY THE SEQUENCE (SEQRES)
CINNAMYCIN 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. THE 14-19 BETA-METHYLLANTHIONINE THIOETHER BOND IS OXIDIZED TO A SULFOXIDE. THE THIOETHER BONDS WITH CYSTEINE RESULT IN THREE RING STRUCTURES, CROSSLINK BETWEEN SER AND LYS RESULT IN THE FOURTH RING. THIS IS FOLLOWED BY MEMBRANE TRANSLOCATION AND CLEAVAGE OF THE MODIFIED PRECURSOR.