Thiamine diphosphate-dependent enzyme (ThDP-dependent enzyme) (ThDP-dependent enzyme)

Thiamine diphosphate (ThDP)-dependent enzymes are a diverse superfamily of enzymes that utilize thiamine diphosphate (the active form of Vitamin B1) as an essential cofactor to catalyze the cleavage and formation of carbon-carbon bonds (Source: UniProt). They play critical roles in central metabolism, including the decarboxylation of alpha-keto acids (e.g., pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase) and the transfer of ketol groups (e.g., transketolase) (Source: Wikipedia). These enzymes are vital for energy production via the Krebs cycle and the generation of NADPH and ribose-5-phosphate through the pentose phosphate pathway (Source: StatPearls). In clinical practice, ThDP-dependent enzymes are significant targets for treating nutritional deficiencies like Beriberi and Wernicke-Korsakoff syndrome through thiamine supplementation (Source: NIH). Furthermore, they are explored as therapeutic targets in cancer, where transketolase activity supports rapid cell proliferation, and in infectious diseases, where bacterial-specific ThDP enzymes like 1-deoxy-D-xylulose 5-phosphate synthase (DXPS) offer opportunities for selective antimicrobial development (Source: PubMed, PMID: 28653501).

Other names

TPP-dependent enzymeThiamine pyrophosphate-dependent enzymeVitamin B1-dependent enzymeThiamine-dependent enzyme

ThDP-dependent enzymes utilize the thiamine diphosphate cofactor to stabilize acyl carbanion equivalents through the formation of a covalent thiazolium-substrate adduct (Source: PubMed, PMID: 15585365). This allows for the cleavage of C-C bonds in alpha-keto acids and alpha-hydroxy ketones. Therapeutic agents either replenish the cofactor to restore metabolic flux in deficiency states or act as competitive inhibitors (antimetabolites) to disrupt essential pathways in pathogens or malignant cells (Source: PubMed, PMID: 24512156).