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- W1997421330 abstract "The binding of human 125I-labeled HDL3 (high-density lipoproteins, rho 1.125-1.210 g/cm3) to a crude membrane fraction prepared from bovine liver closely fit the paradigm expected of a ligand binding to a single class of identical and independent sites, as demonstrated by computer-assisted binding analysis. The dissociation constant (Kd), at both 37 and 4 degrees C, was 2.9 micrograms protein/ml (approx. 2.9 X 10(-8) M); the capacity of the binding sites was 490 ng HDL3 (approx. 4.9 pmol) per mg membrane protein at 37 degrees C and 115 at 4 degrees C. Human low-density lipoproteins (LDL) and very-low-density lipoproteins (VLDL) also bound to these sites (Kd = 41 micrograms protein/ml, approx. 6.7 X 10(-8) M for LDL, and Kd = 5.7 micrograms protein/ml, approx. 7.0 X 10(-9) M for VLDL), but this observation must be considered in light of the fact that the normal circulating concentrations of these lipoproteins are much lower than those of HDL. The binding of 125I-labeled HDL3 to these sites was inhibited only slightly by 1 M NaCl, suggesting the presence of primarily hydrophobic interactions at the recognition site. The binding was not dependent on divalent cations and was not displaceable by heparin; the binding sites were sensitive to both trypsin and pronase. Of exceptional note was the finding that various subclasses of human HDL (including subclasses of immunoaffinity-isolated HDL) displaced 125I-labeled HDL3 from the hepatic HDL binding sites with different apparent affinities, indicating that these sites are capable of recognizing highly specific structural features of ligands. In particular, apolipoprotein A-I-containing lipoproteins with prebeta electrophoretic mobility bound to these sites with a strikingly lower affinity (Kd = 130 micrograms protein/ml) than did the other subclasses of HDL." @default.
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- W1997421330 date "1986-01-01" @default.
- W1997421330 modified "2023-09-29" @default.
- W1997421330 title "Discrimination between subclasses of human high-density lipoproteins by the HDL binding sites of bovine liver" @default.
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- W1997421330 doi "https://doi.org/10.1016/0005-2760(86)90011-1" @default.
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