Transfers 2-(5''-triphosphoribosyl)-3'-dephosphocoenzyme-A on a serine residue to the apo-acyl carrier protein (gamma chain) of the citrate lyase to yield holo-acyl carrier protein. 2'-(5''-triphospho-alpha-D-ribosyl)-3'-dephospho-CoA + apo-[citrate lyase ACP] = diphosphate + holo-[citrate lyase ACP] Repressed by H-NS. Part of the citCDEFXG operon. Belongs to the CitX family.