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The enzyme participates in the biosynthesis of ergotamine, an ergot alkaloid produced by some fungi of the Clavicipitaceae family. The reaction is catalysed in the opposite direction to that shown. The substrate for the enzyme is an iminium intermediate that is formed spontaneously from chanoclavine-I aldehyde in the presence of glutathione.
the reaction occurs only in the presence of the thiolation agents reduced glutathione (conversion rate of 59%) or 2-mercaptoethanol (conversion rate of 99%) and dithiothreitol (conversion rate of 67%). No product formation is detected in the incubation mixture with L-ascorbic acid instead of GSH
New insights into ergot alkaloid biosynthesis in Claviceps purpurea: an agroclavine synthase EasG catalyses, via a non-enzymatic adduct with reduced glutathione, the conversion of chanoclavine-I aldehyde to agroclavine