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Anticoagulant Drugs: Low-Molecular-Weight Heparins

Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
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Characterizing Modulators of Protease-Activated Receptors with a Calcium Mobilization Assay Using a Plate Reader
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Engineering thrombin for selective specificity toward protein C and PAR1.

Francesca Marino1, Leslie A Pelc, Austin Vogt

  • 1Department of Biochemistry and Molecular Biology, St Louis University School of Medicine, St Louis, Missouri 63104, USA.

The Journal of Biological Chemistry
|April 21, 2010
PubMed
Summary

Researchers identified Tryptophan 215 (Trp215) as key to thrombin

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Area of Science:

  • Biochemistry
  • Enzymology
  • Molecular Biology

Background:

  • Thrombin is crucial for blood homeostasis, interacting with various substrates.
  • Understanding thrombin's specificity is vital for its physiological roles and clinical applications.

Purpose of the Study:

  • To identify key residues determining thrombin's substrate specificity.
  • To investigate the role of Trp215 in modulating thrombin's interaction with fibrinogen, PAR1, and protein C.

Main Methods:

  • Utilized Ala-scanning and saturation mutagenesis of 97 residues, focusing on Trp215.
  • Quantified enzyme kinetics (kcat/Km) for substrate hydrolysis.

Main Results:

  • Trp215 was identified as the primary determinant of thrombin specificity.
  • Mutations at Trp215 altered specificity across five orders of magnitude for fibrinogen, PAR1, and protein C.
  • Context-dependent effects were observed, with combined mutations yielding selective activity.

Conclusions:

  • Thrombin's specificity can be re-engineered through targeted mutations, particularly at Trp215.
  • Mutations offer tools to dissect thrombin's functions and explore clinical applications.
  • Selective specificity for protein C and PAR1 is achievable.