BCAT2

BCAT2, or butyryl-CoA acetyltransferase 2, is an enzyme encoded in humans by the BCAT2 gene located on chromosome 19q13.3. It belongs to the thiolase superfamily and plays a crucial role in fatty acid metabolism, particularly in the breakdown of medium- and long-chain fatty acids. The enzyme catalyzes the cleavage of acyl-CoA thioesters into shorter acyl-CoA derivatives and acetyl-CoA, facilitating energy production through β-oxidation.

BCAT2 is primarily expressed in tissues with high metabolic demands, such as the liver, heart, and skeletal muscle. It functions in both the mitochondria and peroxisomes, contributing to the degradation of fatty acids into acetyl-CoA, which enters the citric acid cycle for ATP generation. Unlike its paralog, BCAT1, which is involved in branched-chain amino acid metabolism, BCAT2 is specialized for lipid metabolism.

Mutations in the BCAT2 gene have been linked to rare metabolic disorders, though clinical associations remain less well-defined compared to other metabolic enzymes. Research suggests that BCAT2 may also play a role in regulating lipid homeostasis and energy balance, potentially influencing conditions like obesity and diabetes. Its expression can be influenced by hormonal and nutritional factors, further highlighting its physiological significance.

Structurally, BCAT2 consists of a single polypeptide chain with conserved motifs characteristic of thiolases, including a catalytic cysteine residue essential for its enzymatic activity. Studies on BCAT2 have primarily focused on its biochemical function, with ongoing research exploring its potential as a therapeutic target in metabolic diseases.