cd02007

Thiamine pyrophosphate (TPP) family, DXS subfamily, TPP-binding module; 1-Deoxy-D-xylulose-5-phosphate synthase (DXS) is a regulatory enzyme of the mevalonate-independent pathway involved in terpenoid biosynthesis. Terpeniods are plant natural products with important pharmaceutical activity. DXS catalyzes a transketolase-type condensation of pyruvate with D-glyceraldehyde-3-phosphate to form 1-deoxy-D-xylulose-5-phosphate (DXP) and carbon dioxide. The formation of DXP leads to the formation of the terpene precursor IPP (isopentyl diphosphate) and to the formation of thiamine (vitamin B1) and pyridoxal (vitamin B6).