This entry represents the N-terminal SH3-like domain from MdcG which is a phosphoribosyl-dephospho-CoA transferase that is involved in the biosynthesis of the prosthetic group of malonate decarboxylase [1]. Malonate decarboxylase from Klebsiella pneumoniae contains an acyl carrier protein (MdcC) to which a 2'-(5' '-phosphoribosyl)-3'-dephospho-CoA prosthetic group is attached via phosphodiester linkage. MdcG catalyses the following reaction: 2'-(5''-triphosphoribosyl)-3'-dephospho-CoA + apo-[acyl-carrier-protein] = holo-[acyl-carrier-protein] + diphosphate.

1: Biosynthesis of triphosphoribosyl-dephospho-coenzyme A, the precursor of the prosthetic group of malonate decarboxylase. Hoenke S, Wild MR, Dimroth P; Biochemistry. 2000;39:13223-13232. PMID:11052675