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• W1563369673 abstract "An investigation was made of the role of calcium ions in the reversible stage of fibrin polymerization, using a direct and relatively simple approach. Purified fibrin monomer in solution (7.5 mg/ml) in 1.0 m NaBr (pH 5.3) was polymerized by raising the pH to 5.7–7.7 by the addition of aliquots of standard NaOH solution and the rate and total extent of proton release during polymerization were measured potentiometrically. In the presence of added CaCl2 (10−5-10−2m) the rate of proton release was increased and the clotting time was decreased. The profile of equilibrium proton release vs pH of polymerization was also shifted, the maximum being increased and occurring at a lower pH. Sedimentation velocity studies in the intermediate pH range (5.7–6.0) showed that the altered profile of equilibrium proton release was due to a broadening of the pH range of polymerization, and that polymerization remained reversible in the presence of CaCl2. At pH 5.3, where fibrin is essentially monomeric, addition of CaCl2 resulted in the release of protons and small increases in sedimentation coefficient and reduced viscosity. Under the same conditions, a similar release of protons was observed from fibrinogen, but there was no effect on its sedimentation coefficient. It was concluded that the proton release at pH 5.3 was due mainly to binding of calcium ions to fibrinogen and fibrin monomer. The effect of CaCl2 on the sedimentation coefficient of fibrin at pH 5.3 was found to decrease with decreasing protein concentration, indicating that it was the result of a small extent of polymerization, rather than a conformational change. Added MgCl2 had no effect on fibrin monomer at pH 5.3 and no significant effect on the rate or extent of proton release during polymerization at higher pH, indicating that there are specific binding sites for calcium ions in fibrinogen and fibrin. The observed effects of bound calcium ions on reversible fibrin polymerization are explained most simply in electrostatic terms." @default.
• W1563369673 created "2016-06-24" @default.
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• W1563369673 date "1972-11-01" @default.
• W1563369673 modified "2023-09-25" @default.
• W1563369673 title "Equilibria in the fibrinogen-fibrin conversion" @default.
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• W1563369673 doi "https://doi.org/10.1016/0003-9861(72)90445-6" @default.
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