0 CH-C S-CoA HN ATP ADP+P Malonyl-CoA × HCO 羧基转移酶 生物素羧化酶 Biotin arm 0 NH side arm Biotin Biotin carboxylase carmer protein Biotin Biotin carrier NH protein CH,-C S-CoA Acetyl-CoA C-CH,C 0 S-CoA Malonyl-CoA生物素羧化酶 羧基转移酶