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- W1575771007 abstract "Abstract Cellular retinol-binding protein (CRBP) and cellular retinol-binding protein, type ii (CRBP(II] are cytoplasmic proteins that bind trans-retinol as an endogenous ligand. These proteins are structurally similar having greater than 50% sequence homology. Employing fluorescence, absorbance, and competition studies, the ability of pure preparations of CRBP(II) and CRBP to bind various members of the vitamin A family has been examined. In addition to trans-retinol, CRBP(II) was able to form high affinity complexes (K'd less than 5 X 10(-8) M) with 13-cis-retinol, 3-dehydroretinol, and all-trans-retinaldehyde. CRBP bound those retinol isomers with similar affinities, but did not bind trans-retinaldehyde. Neither protein bound retinoic acid nor 9-cis- and 11-cis-retinol. The spectra of 13-cis-retinol and 3-dehydroretinol, when bound, were shifted and displayed fine structure compared to their spectra in organic solution. However, the lambda max and fluorescent yield of a particular ligand were different when bound to CRBP(II) versus CRBP. It appears that CRBP(II) and CRBP bind trans-retinol, 13-cis-retinol, and 3-dehydroretinol in a planar configuration. However, the binding sites of CRBP(II) and CRBP are clearly distinct based on the observed spectral differences of the bound ligands and the observations that only CRBP(II) could bind trans-retinaldehyde. The ability of CRBP(II) to bind trans-retinaldehyde suggests a physiological role for the protein in accepting retinaldehyde generated from the cleavage of beta-carotene in the absorptive cell." @default.
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- W1575771007 modified "2023-09-28" @default.
- W1575771007 title "Binding specificities of cellular retinol-binding protein and cellular retinol-binding protein, type II." @default.
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