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• W1972932970 abstract "Eye lenses of various diurnal geckos contain up to 12% iota-crystallin. This protein is related to cellular retinol-binding protein type I (CRBP I) but has 3,4-didehydroretinol, rather than retinol, as a ligand. The 3,4-didehydroretinol gives the lens a yellow color, thus protecting the retina by absorbing short-wave radiation. iota-Crystallin could be either the gecko's housekeeping CRBP I, recruited for an additional function in the lens, or the specialized product of a duplicated CRBP I gene. The finding of the same CRBP I-like sequence in lens and liver cDNA of the gecko Lygodactylus picturatus now supports the former option. Comparison with iota-crystallin of a distantly related gecko, Gonatodes vittatus, and with mammalian CRBP I, suggests that acquiring the additional lens function is associated with increased amino acid changes. Compared with the rat CRBP I structure, the iota-crystallin model shows reduced negative surface charge, which might facilitate the required tight protein packing in the lens. Other changes may provide increased stability, advantageous for a long-living lens protein, without frustrating its role as retinol transporter outside the lens. Despite a number of replacements in the ligand pocket, recombinant iota-crystallin binds 3,4-didehydroretinol and retinol with similar and high affinity (approximately 1.6 nM). Availability of ligand thus determines whether it binds 3,4-didehydroretinol, as in the lens, or retinol, in other tissues. iota-Crystallin presents a striking example of exploiting the potential of an existing gene without prior duplication." @default.
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• W1972932970 date "2000-03-28" @default.
• W1972932970 modified "2023-09-27" @default.
• W1972932970 title "Gecko -crystallin: How cellular retinol-binding protein became an eye lens ultraviolet filter" @default.
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• W1972932970 doi "https://doi.org/10.1073/pnas.97.7.3282" @default.
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