Thiamine biosynthesis enzymes

Thiamine biosynthesis enzymes are a group of proteins responsible for the de novo synthesis of thiamine (vitamin B1), a vital cofactor for enzymes involved in carbohydrate and amino acid metabolism (Jurgenson et al., 2009). These enzymes facilitate the production of thiamine pyrophosphate (TPP), which is essential for the activity of pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase (Begley et al., 1999). Because humans and other mammals lack the genetic machinery for thiamine synthesis and must acquire it through dietary sources, these enzymes are absent in the human proteome (Du et al., 2011). This metabolic disparity makes the pathway a highly selective target for antimicrobial, antifungal, and antiprotozoal drug development (Fitzpatrick et al., 2012). Inhibitors can target the pathogen's metabolic requirements without directly interfering with human de novo synthesis, which does not exist. Key enzymes in the pathway include hydroxymethylpyrimidine synthase (ThiC), thiamine-phosphate synthase (ThiE), and thiamine-monophosphate kinase (ThiL). Drugs like amprolium and various thiamine analogs act by inhibiting these enzymes or competing with thiamine precursors, leading to thiamine deficiency and subsequent growth arrest in the target organism (PubChem).

Other names

Thiamin biosynthetic pathway enzymesVitamin B1 biosynthesis enzymesDe novo thiamine synthesis pathway

Inhibition of de novo thiamine synthesis by targeting enzymes such as thiamine-phosphate synthase or acting as antimetabolite analogs of thiamine precursors.