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- W2003049631 abstract "Abstract Cytosol retinyl ester lipoprotein complex from rat liver was capable of transferring its unesterified retinol component to serum aporetinol-binding protein. In the presence of serum albumin and aporetinol-binding protein, 68% of retinyl ester was hydrolyzed and up to 30% of unesterified retinol was transferred from cytosol retinyl ester lipoprotein complex to serum aporetinol-binding protein in 24 h at 30 °C. The reconstituted retinol-retinol-binding protein complex showed biochemical and biophysical properties similar to native retinol-retinol-binding protein. Both native and reconstituted retinol-retinol-binding proteins had identical uv, CD, and fluorescence spectra as well as binding affinity to prealbumin. Treatment of cytosol retinyl ester lipoprotein with sulfhydryl reagent, with 1 n NaCl, or with diisopropyl fluorophosphate (0.14 m m ) abolished the hydrolysis of retinyl ester; however, the activity of retinol transfer from cytosol retinyl ester lipoprotein complex to serum retinol-binding protein was still unaffected. The activity of retinol transfer was proportional to the amount of retinol content in the complex and the amount of aporetinol-binding protein. These experiments suggest that the cytosol retinyl ester lipoprotein complex serves three major functions: (i) as a storage form of retinyl ester and retinol; (ii) as an enzyme for hydrolyzing its own retinyl ester ligand; and (iii) as a medium for transfer of unesterified retinol to serum retinol-binding protein." @default.
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- W2003049631 date "1981-04-01" @default.
- W2003049631 modified "2023-09-26" @default.
- W2003049631 title "Retinol transfer from rat liver cytosol retinyl ester lipoprotein complex to serum retinol-binding protein" @default.
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- W2003049631 doi "https://doi.org/10.1016/0003-9861(81)90046-1" @default.
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