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The reactions of 6-cyano-1,3-dimethyluracil have been studied as chemical models to illustrate the mechanism for the transformation of 6-cyanouridine 5′-monophosphate (6-CN-UMP) to barbiturate ribonucleoside 5′-monophosphate (BMP) catalyzed by orotidine 5′-monophosphate decarboxylase (ODCase). The results suggest that the Asp residue in the ODCase active site plays the role of a general base in the transformation.

Graphical abstract: Chemical models and their mechanistic implications for the transformation of 6-cyanouridine 5′-monophosphate catalyzed by orotidine 5′-monophosphate decarboxylase

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