Identification of N epsilon-(carboxyethyl)lysine, one of the methylglyoxal-derived AGE structures, in glucose-modified protein: mechanism for protein modification by reactive aldehydes

Ryoji Nagai, Tomohiro Araki, Cristina Miki Hayashi, Fumitaka Hayase, Seikoh Horiuchi
Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences 2003 May 5, 788 (1): 75-84
We have developed a separation system for N(epsilon)-(carboxyethyl)lysine (CEL) and N(epsilon)-(carboxymethyl)lysine (CML) by HPLC equipped with a styrene-divinylbenzene copolymer resin coupled with sulfonic group cation-exchange column and examined whether CEL is formed from proteins modified by glucose via the Maillard reaction. CEL was generated by incubating bovine serum albumin (BSA) with glucose, a reaction inhibited by aminoguanidine, but enhanced by phosphate. Although several aldehydes were detected during incubation of N(alpha)-acetyllysine with glucose, incubation of BSA with methylglyoxal alone generated CEL. These results indicate that methylglyoxal is responsible for CEL formation on protein in vitro.

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