Biotin-dependent carboxylase

Biotin-dependent carboxylases are a conserved family of enzymes essential for a range of metabolic processes, including fatty acid, amino acid, and carbohydrate metabolism. They catalyze carboxylation reactions requiring biotin as a cofactor, functioning via a multistep mechanism that involves distinct enzymatic domains: a biotin carboxylase (BC) that activates and carboxylates biotin, a carboxyltransferase (CT) that transfers the carboxyl group to target substrates, and a biotin-carboxyl carrier protein (BCCP) that tethers and translocates biotin between domains. Multiple proteins in this family (such as acetyl-CoA carboxylase, propionyl-CoA carboxylase, 3-methylcrotonyl-CoA carboxylase, and others) are implicated as therapeutic targets for cancer, diabetes, obesity, and infections, and as diagnostic markers for inborn metabolic diseases. The broad physiological roles and high degree of sequence conservation make this enzyme family both attractive and challenging as drug targets.

Other names

Biotin carboxylase (BC)Acetyl-CoA carboxylase (ACC, a prototypical example)Propionyl-CoA carboxylase (PCC)3-methylcrotonyl-CoA carboxylase (MCC)Pyruvate carboxylase (PC)Urea carboxylase (UC)

Inhibition of enzymatic carboxylation activity, leading to interruption of downstream metabolic pathways essential for cell growth, fatty acid synthesis, or survival. Herbicidal action in plants by plastid ACC inhibition. Antibiotic mechanism via bacterial or fungal enzyme inhibition.