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FiG. 1. Structures of Violacein and Deoxyvio]acein. tryptophan is a biosynthetic precursor with the involvemcnt of a decarboxylation process.4) However, the biosynthetic pathway and mechanism, as well as the origin, of the 2-pyrrolidone nucleus are still unknown. Feeding experiments using [2-i3C] and E3i3C]tryptophans have established that the carbon skeleton of the pyrrolidone moiety was constructed by the condensation of the side chains of two tryptophan molecuies, and have also revealed the interesting phenomenon that one of the two indole rings migrated to the 2-

agricultural and biological chemistry

Studies on the biosynthesis of violacein. part I Biosynthesis of violacein : A novel rearrangement in tryptophan metabolism with a 1,2-shift of the indole ring.