BCATs

BCATs, or branched-chain amino acid transaminases, are a family of enzymes that play a crucial role in the metabolism of branched-chain amino acids (BCAAs). These BCAAs, namely leucine, isoleucine, and valine, are essential amino acids meaning they cannot be synthesized by the body and must be obtained through diet. BCATs are primarily found in skeletal muscle, heart, and brain tissue.

The primary function of BCATs is the reversible transfer of an amino group from a BCAA to an alpha-keto acid, typically alpha-ketoglutarate. This process is the first step in BCAA catabolism, converting BCAAs into their corresponding alpha-keto acids. These alpha-keto acids can then enter other metabolic pathways, such as energy production or gluconeogenesis. The reversible nature of the reaction means BCATs can also be involved in BCAA synthesis.

There are two main isoforms of BCATs in mammals: BCAT1 (also known as BCAT-C) and BCAT2 (also known as BCAT-M). BCAT1 is predominantly found in cytosolic fractions, while BCAT2 is located in the mitochondria. Both isoforms are pyridoxal-5'-phosphate (PLP)-dependent enzymes, meaning they require vitamin B6 as a cofactor for their activity. Disruptions in BCAT activity have been linked to various metabolic disorders and neurological conditions, highlighting their importance in maintaining cellular and organismal health.