Thiamine pyrophosphate-dependent enzymes (TPP-dependent enzymes) (TPP-dependent enzymes)

Thiamine pyrophosphate-dependent enzymes are a group of metabolic catalysts that require thiamine pyrophosphate (TPP), the active form of Vitamin B1, to perform essential biochemical reactions, primarily the cleavage of carbon-carbon bonds (StatPearls, 2023). This group includes critical complexes such as pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, and branched-chain alpha-keto acid dehydrogenase, which are central to the citric acid cycle and cellular energy production (UniProt, 2024). Additionally, transketolase is a key TPP-dependent enzyme in the pentose phosphate pathway, facilitating the synthesis of ribose-5-phosphate for nucleic acids and NADPH for reductive biosynthesis (PubMed, 2014). Dysregulation or deficiency of these enzymes leads to severe clinical manifestations, including Wernicke-Korsakoff syndrome and Beriberi, characterized by neurological and cardiovascular impairment (NIH, 2023). In oncology, certain TPP-dependent enzymes like transketolase-like 1 (TKTL1) are often overexpressed to support the Warburg effect and tumor proliferation, making them targets for metabolic inhibitors (PubMed, 2014). Therapeutic intervention typically focuses on thiamine supplementation to restore enzyme function or the use of lipophilic thiamine analogs to improve central nervous system delivery.

Other names

Thiamine diphosphate-dependent enzymesThDP-dependent enzymesTPP-requiring enzymesMultiple metabolic enzymes using thiamine pyrophosphate cofactor

Cofactor supplementation to restore enzymatic activity in deficiency states (StatPearls, 2023); competitive inhibition by thiamine antimetabolites to disrupt tumor metabolism (PubMed, 2014).