Human Acetyl-CoA Carboxylase 2, ACACB ELI

Mitochondrial enzyme that catalyzes the carboxylation of acetyl-CoA to malonyl-CoA and plays a central role in fatty acid metabolism (PubMed: 16854592, PubMed: 19236960, PubMed: 20457939, PubMed: 20952656, PubMed: 19900410, PubMed: 26976583).

Catalyzes a 2 steps reaction starting with the ATP-dependent carboxylation of the biotin carried by the biotin carboxyl carrier (BCC) domain followed by the transfer of the carboxyl group from carboxylated biotin to acetyl-CoA (PubMed: 19236960, PubMed: 20457939, PubMed: 20952656, PubMed: 26976583).

Through the production of malonyl-CoA that allosterically inhibits carnitine palmitoyltransferase 1 at the mitochondria, negatively regulates fatty acid oxidation (By similarity).

Together with its cytosolic isozyme ACACA, which is involved in de novo fatty acid biosynthesis, promotes lipid storage (By similarity).