Other Thiamine diphosphate-dependent enzymes (Other ThDP-dependent enzymes)

Other Thiamine diphosphate-dependent (ThDP-dependent) enzymes constitute a broad group of proteins that utilize the active form of Vitamin B1 as a cofactor to catalyze essential carbon-carbon bond cleavage and formation. While major members like the pyruvate dehydrogenase complex and transketolase are well-characterized in human central metabolism, this "other" category includes specialized enzymes such as 1-deoxy-D-xylulose 5-phosphate synthase (DXPS) and acetohydroxyacid synthase (AHAS), which are vital for bacterial and plant survival but absent in humans. These enzymes are involved in diverse pathways, including the non-mevalonate isoprenoid pathway and the biosynthesis of branched-chain amino acids, making them high-value targets for the development of novel antibiotics, antimalarials, and herbicides. In humans, this group also encompasses enzymes like 2-hydroxyacyl-CoA lyase 1 (HACL1) and transketolase-like proteins (TKTL1), which have been implicated in cancer cell proliferation and neurodegenerative processes. Pharmacological intervention typically involves thiamine mimetics or phosphonate analogs that compete for the ThDP-binding pocket, though selectivity remains a significant challenge to avoid interfering with host energy metabolism.

Other names

Thiamine pyrophosphate-dependent enzymesTPP-dependent enzymesThDP-dependent carboligasesThDP-dependent decarboxylases

Cofactor supplementation, competitive inhibition of the ThDP-binding site, transition-state mimicry, and antimetabolite-mediated disruption of metabolic flux.