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• W2011775984 abstract "The binding of [3H]heparin to human plasma lipoproteins was measured using a gel filtration assay on columns of Ultrogel AcA 54. [3H]Heparin formed a soluble complex with low density lipoprotein (LDL) as evidenced by the appearance of a new radioactive peak emerging at the void volume where the lipoproteins elute. Free heparin on the other hand was retarded on this column and eluted at a later volume. Heparin binding to LDL could also be demonstrated on columns of Sepharose 4B, in which case two included peaks of 3H were observed to elute in the area of LDL and of heparin. [3H]Heparin did not bind to either high or very low density lipoproteins as determined by the gel filtration assay. The binding of the [3H]heparin to LDL was proportional to both the concentration of LDL and of heparin and both showed saturation kinetics. Cations were not necessary for binding, nor was binding inhibited by EDTA. LDL showed a marked specificity for heparin. Thus, the binding of [3H]heparin to LDL was strongly inhibited by the addition of unlabeled heparin, while other glycosaminoglycans such as chondroitin sulfate, heparan sulfate, keratan sulfate, and dermatan sulfate were not effective inhibitors except at very high concentrations. Salts, especially K2HPO4 and (NH4)2SO4, also inhibited binding when added at concentrations of 10 mm or higher suggesting an ionic interaction between heparin and LDL. The pH optimum for binding was between 7.5 and 8.5 but binding fell off markedly above pH 9.0. The [3H]heparin was heterogeneous and could be separated into four fractions on columns of Sephadex G-75. When these fractions were tested for binding to LDL, only the high molecular weight fraction bound to any significant extent. LDL was treated with reagents used to selectively modify basic amino acid residues, and the effect of these treatments on heparin binding was examined. Thus, ethoxyformic anhydride was used for histidine modification, acetic anhydride and succinic anhydride for lysines and cyclohexanedione for arginine residues. In each case there was a significant loss in heparin binding suggesting that various basic amino acids are involved in binding and/or that basic amino acids are necessary to maintain the proper conformation of LDL." @default.
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• W2011775984 title "Binding of [3H]heparin to human plasma low density lipoprotein" @default.
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• W2011775984 doi "https://doi.org/10.1016/0003-9861(78)90208-4" @default.
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