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- W1567264882 abstract "Heparin was fractionated by affinity chromatography on immobilized antithrombin III followed by gel filtration on Sephadex G-100. Eighteen fractions were obtained ranging in molecular weight from 9,700 to 34,300 as determined by sedimentation equilibrium. The binding stoichiometries of antithrombin III and thrombin interactions with the heparin of these fractions were measured, using changes in intrinsic and extrinsic fluorescence. Catalytic activity also was measured for each of the heparin fractions. As the molecular weight of heparin varied from about 10,000 to 30,000, the average number of antithrombin and thrombin sites/heparin molecule varied from 1.0 to 2.1 and 2.4 to 6.8. In addition, the molar specific activity increased 5.7-fold, an increase which correlated directly with the product of the number of antithrombin III and thrombin molecules bound. Thus as the number of bound molecules increased with increased molecular weight, the rate of reaction/bound antithrombin III increased in proportion to the number of bound thrombin molecules and vice versa. This can be explained by assuming that heparin functions as a template for both proteins, that all bound thrombin and antithrombin III molecules are accessible to each other, and that the rate at which a bound molecule reacts is proportional to the number of molecules of its interacting counterpart bound. These observations and conclusions are similar to those of Hoylaerts et al. (Hoylaerts, M., Owen, W. G., and Collen, D. (1984) J. Biol. Chem. 259, 5670-5677), who demonstrated that the rate at which single molecules of antithrombin III, covalently attached to heparin, react increases as the thrombin binding capacity (chain length) of heparin increases." @default.
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- W1567264882 date "1986-03-01" @default.
- W1567264882 modified "2023-09-26" @default.
- W1567264882 title "Dependence of antithrombin III and thrombin binding stoichiometries and catalytic activity on the molecular weight of affinity-purified heparin." @default.
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- W1567264882 doi "https://doi.org/10.1016/s0021-9258(17)35770-8" @default.
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