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Related Experiment Video

Updated: Apr 3, 2026

Ferric Chloride-induced Murine Thrombosis Models

Ferric Chloride-induced Murine Thrombosis Models

Published on: September 5, 2016

Molecular mechanisms of thrombin function

E Di Cera¹, Q D Dang, Y M Ayala

¹Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110, USA. enrico@caesar.wustl.edu

Cellular and Molecular Life Sciences : CMLS

|November 22, 1997

Summary

This summary is machine-generated.

Sodium ions (Na+) regulate thrombin, a key enzyme in blood clotting, by allosterically controlling its activity and specificity. This discovery offers new insights into protease function and potential therapeutic targets.

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Area of Science:

Biochemistry
Enzymology
Molecular Biology

Background:

Thrombin is a crucial serine protease in the coagulation cascade.
Its physiological interactions and specificity have been areas of extensive research.
Understanding allosteric regulation is key to comprehending enzyme function.

Purpose of the Study:

To elucidate the mechanism of Na(+)-dependent allosteric regulation in thrombin.
To provide a mechanistic framework for thrombin's interactions with key substrates.
To explore the implications for enzyme engineering and drug design.

Main Methods:

Structural and functional analysis of thrombin.
Investigation of Na+ binding effects on enzyme activity and specificity.
Comparative analysis with other proteases.

Main Results:

Thrombin functions as a Na(+)-dependent allosteric enzyme, influencing its interactions with fibrinogen, thrombomodulin, and protein C.
Na+ binding modulates the specificity sites of thrombin.
A specific residue at position 225 is critical for Na(+)-dependent allosteric regulation of catalytic activity.

Conclusions:

Na(+)-dependent allosteric regulation is a fundamental mechanism for thrombin and other proteases.
This mechanism provides a basis for engineering thrombin mutants and designing inhibitors.
Sodium ions are critical regulators in the activation of zymogens in coagulation and complement systems.