Covalently binds beta-alanine in an ATP-dependent manner to form a thioester bond with its phosphopantetheine group and transfers it to an, as yet, unknown acceptor. May be required for a post-translational protein modification or for post-transcriptional modification of an RNA. Ubiquitously expressed in adult tissues. Belongs to the ATP-dependent AMP-binding enzyme family. Truncated N-terminus.