THIOSTREPTON IS A MEMBER OF A SULPHUR-RICH HETEROCYCLIC PEPTIDES CLASS. ALL SHARE A MACROCYLIC ...THIOSTREPTON IS A MEMBER OF A SULPHUR-RICH HETEROCYCLIC PEPTIDES CLASS. ALL SHARE A MACROCYLIC CORE, CONSISTING OF A NITROGEN CONTAINING, SIX-MEMBERED RING CENTRAL TO DEHYDROAMINO ACIDS AND A SUBSET OF FIVE MEMBER RING STRUCTURES INCLUDING THIAZOLES, THIAZOLINES AND OXAZOLES. HERE, THIOSTREPTON IS REPRESENTED BY THE SEQUENCE (SEQRES) GROUP: 1 NAME: THIOSTREPTON CHAIN: A COMPONENT_1: PEPTIDE LIKE SEQUENCE RESIDUES 0 TO 18 DESCRIPTION: THIOSTREPTON IS A HETROCYCLIC THIOPEPTIDE, CONSISTING OF FOUR THIAZOLES ONE THIOZOLINE ONE PIPERIDEINE RINGS. A MODIFIED QUINOLINE LINKED TO MAIN-CHAIN RESIDUE 1 AND SIDE-CHAIN OF RESIDUE 12. THE OBSERVED C-TERMINAL AMINO GROUP NH2(18) IS LIKELY TO BE A POST-TRANSLATIONAL DECARBOXYLATED REMNANT OF A SER C-TERMINAL RESIDUE