2.7.8.7 | CoA-[4'-phosphopantetheine] + an apo-[acyl-carrier protein] = adenosine 3',5'-bisphosphate + an [acyl-carrier protein] |
sequential binding mechanism: initial CoA- and Mg2+-binding followed by binding of acyl-carrier protein (ACP), nucleophilic attack of ACP-serine-hydroxylate on beta-phosphate of CoA followed by charge migration, Lys185-protonation, diphosphate-cleavage, and product dissociation, rate limiting step: release of 3',5'-ADP, key acid/base catalysts: residues E181 (CoA-binding) and K185 (Mg2+-binding) |
691732 |