Involved in the biosynthesis of the catecholic siderophore bacillibactin. Catalyzes the activation of the carboxylate group of 2,3-dihydroxy-benzoate (DHB), via ATP-dependent PPi exchange reactions, to the acyladenylate. 2,3-dihydroxybenzoate + ATP + holo-[aryl-carrier protein] = 2,3-dihydroxybenzoyl-[aryl-carrier protein] + AMP + diphosphate Siderophore biosynthesis; bacillibactin biosynthesis. Belongs to the ATP-dependent AMP-binding enzyme family.