Malonate decarboxylase holo-(acyl-carrier protein) synthase (, holo ACP synthase, '2'-(5<nowiki></nowiki>-triphosphoribosyl)-3'-dephospho-CoA:apo ACP 2'-(5<nowiki></nowiki>-triphosphoribosyl)-3'-dephospho-CoA transferase, MdcG, 2'-(5<nowiki></nowiki>-triphosphoribosyl)-3'-dephospho-CoA:apo-malonate-decarboxylase adenylyltransferase, holo-malonate-decarboxylase synthase) is an enzyme with systematic name 2'-(5-triphosphoribosyl)-3'-dephospho-CoA:apo-malonate-decarboxylase 2'-(5-phosphoribosyl)-3'-dephospho-CoA-transferase . This enzyme catalyses the following chemical reaction
The delta subunit of malonate decarboxylase serves as an acyl-carrier protein (ACP) .