Involved in the formation of 2-(5''-phosphoribosyl)-3'-dephosphocoenzyme-A, the prosthetic group of the acyl-carrier protein of the malonate decarboxylase. 3'-dephospho-CoA + ATP = 2'-(5''-triphospho-alpha-D-ribosyl)-3'-dephospho-CoA + adenine Belongs to the CitG/MdcB family.