The Formation of Argpyrimidine in Glyceraldehyde-Related Glycation

Three major glyceraldehyde-related advanced glycation end products (AGEs) were formed from a mixture of N^α-acetyllysine, N^α-acetylarginine, and glyceraldehyde. Two of the compounds were MG-H1 and GLAP, as previously reported, and the other compound was identified as N^α-acetyl-N^δ-(5-hydroxy-4,6-dimethyl-pyrimidin-2-yl)-ornithine, argpyrimidine (APN). APN is a modification product of arginine residue, but it did not form from glyceraldehyde with arginine residue. The coexistence of lysine residue was necessary to APN formation.