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Thromb Haemost 1977; 38(03): 0677-0684
DOI: 10.1055/s-0038-1651883
Original Article
Schattauer GmbH

Effect of Calcium ion on the interaction between Thrombin and Heparin. Thermal Denaturation

Raymund Machovich
1   Postgraduate Medical School, First Department of Medicine, 1389 Budapest and Institute of Biochemistry II, Semmelweis University Medical School, 1088 Budapest, Hungary
,
Péter Arányi
1   Postgraduate Medical School, First Department of Medicine, 1389 Budapest and Institute of Biochemistry II, Semmelweis University Medical School, 1088 Budapest, Hungary
› Author Affiliations
Further Information

Publication History

Received 05 February 1977

Accepted 10 June 1977

Publication Date:
04 July 2018 (online)

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Summary

Heat inactivation of thrombin at 54° C followed first order kinetics with a rate constant of 1.0 min−1 approximately. Addition of heparin resulted in protection against thermal denaturation and, at the same time, rendered denaturation kinetics more complex. Analysis of the biphasic curve of heat inactivation in the presence of heparin revealed that the rate constants of the second phase changed systematically with heparin concentrations. Namely, at 4.5 × 10−6M, 9 × 10−6M, 1.8 × 10−5M and 3.6 × 10−5M heparin concentrations, the rate constants were 0.27 min−1, 0.17 min−1, 0.11 min−1 and 0.06 min−1, respectively.

Sulfate as well as phosphate ions displayed also enzyme protection against heat inactivation, however, the same effect was obtained already at a heparin concentration, lower by three orders of magnitude.

The kinetics of enzyme denaturation was not affected by calcium ions, whereas in the presence of heparin the inactivation rate of thrombin changed, i. e. calcium ions abolished the biphasic character of time course of thermal denaturation.

Thus, the data suggest that calcium ions contribute to the effect of heparin on thrombin.

 

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