Catalytic activity:ATP + acetyl-CoA + HCO (3) (-) = ADP + phosphate + malonyl-CoA. ,Catalytic activity:ATP + biotin-carboxyl-carrier protein + CO (2) = ADP + phosphate + carboxybiotin-carboxyl-carrier protein. ,cofactor:Binds 2 manganese ions per subunit. ,cofactor:Biotin. ,enzyme regulation:Activated by citrate. Inhibited by malonyl-CoA. ,Function:ACC-beta may be involved in the provision of malonyl-CoA or in the regulation of fatty acid oxidation , rather than fatty acid biosynthesis. Carries out three functions: biotin carboxyl carrier protein , biotin carboxylase and carboxyltransferase. ,pathway:Lipid metabolism; malonyl-CoA biosynthesis; malonyl-CoA from acetyl-CoA: step 1/1. ,similarity:Contains 1 ATP-grasp domain. ,similarity:Contains 1 biotin carboxylation domain. ,similarity:Contains 1 biotinyl-binding domain. ,similarity:Contains 1 carboxyltransferase domain. ,subcellular location:May associate with membranes. ,tissue specificity:Predominantly expressed in the heart , skeletal muscles and liver. ,
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