Transfers the 4'-phosphopantetheine moiety from coenzyme A to a Ser of an acyl-carrier-protein (By similarity). This isozyme may be involved into a specific lipid biosynthetic pathway that also includes Z1545, Z1546 and Z1547. apo-[ACP] + CoA = adenosine 3',5'-bisphosphate + H(+) + holo-[ACP] Belongs to the P-Pant transferase superfamily. AcpS family.