Thiamine pyrophosphate (TPP)

Thiamine pyrophosphate (TPP), also known as thiamine diphosphate (TDP), is the biologically active coenzyme derivative of vitamin B1 (thiamine), essential for cellular energy metabolism across all domains of life [1][2]. It is synthesized intracellularly from thiamine by the enzyme thiamine pyrophosphokinase and serves as a critical prosthetic group for several multi-enzyme complexes, including pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase [1][4]. These enzymes facilitate the oxidative decarboxylation of alpha-keto acids, bridging glycolysis with the citric acid cycle to generate ATP [2][5]. TPP is also the sole cofactor for transketolase in the pentose phosphate pathway, which is vital for producing NADPH and the pentose sugars required for nucleic acid synthesis [4][6]. In clinical medicine, TPP availability is central to treating deficiency syndromes such as Beriberi and Wernicke-Korsakoff syndrome, which manifest as severe neurological and cardiovascular dysfunction [4][6]. Beyond its enzymatic role, TPP functions as a key regulatory ligand for TPP riboswitches found in bacterial mRNA [7][8]. These riboswitches control the expression of genes involved in the biosynthesis and transport of thiamine, making them high-priority targets for the development of novel antibacterial agents [8][9]. Small-molecule analogs of TPP are currently being explored as inhibitors that bind these riboswitches to disrupt bacterial metabolism and overcome conventional antibiotic resistance [9].

Other names

Thiamine diphosphateTDPCocarboxylaseVitamin B1 pyrophosphateThiamine chloride pyrophosphate

Acts as a catalytic coenzyme providing a nucleophilic thiazolium ring to stabilize carbanion intermediates in decarboxylation and ketol transfer reactions; also functions as a regulatory ligand for bacterial riboswitches to modulate gene expression.