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J Biol Chem, Vol. 274, Issue 46, 32547-32550, November 12, 1999

COMMUNICATION
Human Lens Coloration and Aging
EVIDENCE FOR CRYSTALLIN MODIFICATION BY THE MAJOR ULTRAVIOLET FILTER, 3-HYDROXY-KYNURENINE O--D-GLUCOSIDE

From the Australian Cataract Research Foundation, University of Wollongong, Wollongong, New South Wales 2522, Australia

The human lens becomes increasingly yellow with age and thereby reduces our perception of blue light. This coloration is associated with lens proteins (crystallins), but its molecular basis was unknown. Here we show that the coloration occurs because of the interaction of crystallins with a UV filter compound, 3-hydroxykynurenine glucoside (3-OHKG). Crystallin modification results from deamination of the 3-OHKG amino acid side chain, yielding an unsaturated ketone that is susceptible to nucleophilic attack by cysteine, histidine, and lysine residues. This novel protein modification contributes to age-related lens coloration and may play a role in human nuclear cataractogenesis.

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