Anti-crosslinking properties of carnosine: significance of histidine

Life Sciences
Laura J HobartN W Seidler

Abstract

Carnosine, a histidine-containing dipeptide, is a potential treatment for Alzheimer's disease. There is evidence that carnosine prevents oxidation and glycation, both of which contribute to the crosslinking of proteins; and protein crosslinking promotes beta-amyloid plaque formation. It was previously shown that carnosine has anti-crosslinking activity, but it is not known which of the chemical constituents are responsible. We tested the individual amino acids in carnosine (beta-alanine, histidine) as well as modified forms of histidine (alpha-acetyl-histidine, 1-methyl-histidine) and methylated carnosine (anserine) using glycation-induced crosslinking of cytosolic aspartate aminotransferase as our model. beta-Alanine showed anti-crosslinking activity but less than that of carnosine, suggesting that the beta-amino group is required in preventing protein crosslinking. Interestingly, histidine, which has both alpha-amino and imidazolium groups, was more effective than carnosine. Acetylation of histidine's alpha-amino group or methylation of its imidazolium group abolished anti-crosslinking activity. Furthermore, methylation of carnosine's imidazolium group decreased its anti-crosslinking activity. The results suggest that histidi...Continue Reading

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