Lipoamide-containing enzyme

Lipoamide-containing enzymes are a group of mitochondrial multi-enzyme complexes that utilize lipoic acid covalently attached to lysine residues as an essential prosthetic group. These include the pyruvate dehydrogenase complex, 2‑oxoglutarate dehydrogenase complex, branched-chain alpha-keto acid dehydrogenase complex, and the glycine cleavage system. Each contains one or more subunits that use lipoamide for catalyzing oxidative decarboxylation reactions central to energy metabolism—converting key metabolites into acetyl-CoA or succinyl-CoA while reducing NAD+ to NADH for ATP production. The best-characterized example is dihydrolipoamide dehydrogenase (DLD), which acts as the E3 component common across these complexes. Mutations affecting these enzymes can cause severe metabolic diseases due to impaired mitochondrial energy generation. Because “lipoamide-containing enzymes” refers collectively rather than individually, this entry is too broad for precise drug targeting without specifying which member is meant.

Other names

Lipoamide-dependent enzymeLipoic acid–containing enzymeMulti-enzyme complexes with lipoamide prosthetic group

Catalysis of redox reactions involving transfer of acyl groups and electrons between substrates and coenzymes such as NAD+ and FAD