Metabolic enzymes using vitamin cofactors

Metabolic enzymes using vitamin cofactors represent a broad functional class of proteins that require non-protein organic molecules, derived from vitamins, to catalyze essential biochemical reactions. These cofactors, such as Thiamine pyrophosphate (B1), Flavin adenine dinucleotide (B2), and Tetrahydrofolate (B9), act as essential chemical tools for the transfer of electrons or functional groups during metabolism (StatPearls, 2023). Because these enzymes are central to life-sustaining processes like cellular respiration and nucleotide synthesis, they are frequent targets for pharmacological intervention. For example, antifolate drugs like methotrexate inhibit dihydrofolate reductase (a B9-dependent enzyme) to treat cancer and autoimmune diseases (NCBI, 2024). Similarly, vitamin K antagonists like warfarin target vitamin K epoxide reductase to manage blood coagulation (PubMed, 2022). However, because this term encompasses hundreds of distinct enzymes across various pathways, it is considered a functional category rather than a specific, individual therapeutic target.

Other names

Vitamin-dependent enzymesCoenzyme-dependent enzymesCofactor-dependent metabolic enzymes

Drugs typically act as competitive inhibitors of specific enzymes within this class by mimicking the structure of the vitamin-derived cofactor or the substrate, thereby blocking essential metabolic flux.