Catalyzes the production of acetyl-CoA, an activated form of acetate that can be used for lipid synthesis or for energy generation. May play a limited role in the biosynthesis of lipids. acetate + ATP + CoA = acetyl-CoA + AMP + diphosphate Expressed in leaves, flower buds and young flowers. In the forming silique, expressed in the funiculus and ovule from 1 to 3 day after flowering (DAF). At 3 DAF, expressed in the globular embryo, but expression decreases at 5 DAF and almost disappears at 7 DAF in the embryo. By 1 d after imbibition, expressed in the tip of seed radicle and then in the root tip up to 4 d after imbibition. Belongs to the ATP-dependent AMP-binding enzyme family.