Involved in the biosynthesis of mycolic acids (By similarity). Catalyzes the activation of long-chain fatty acids as acyl-adenylates (acyl-AMP), which are then transferred to the phosphopantetheine arm of the polyketide synthase Pks13 for further chain extension (By similarity). a long-chain fatty acid + ATP + holo-[ACP] = a long-chain fatty acyl-[ACP] + AMP + diphosphate Lipid metabolism; mycolic acid biosynthesis. Belongs to the ATP-dependent AMP-binding enzyme family.