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Related Experiment Videos

Thrombin interaction with fibrin polymerization sites

K Hsieh1

  • 1Department of Veterinary and Comparative Anatomy, Pharmacology and Physiology Washington State University, Pullman 99164-6520, USA.

Thrombosis Research
|May 15, 1997
PubMed
Summary
This summary is machine-generated.

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Fibrin

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hematology

Background:

  • Thrombin is crucial for hemostasis, fibrinolysis, and wound healing.
  • Fibrinogen is converted to fibrin by thrombin, which then binds thrombin within the clot.
  • This binding protects thrombin from inactivation, preserving its activity for post-clotting functions.

Purpose of the Study:

  • To investigate the interaction between specific fibrin N-terminal polymerization sites and thrombin.
  • To differentiate the mechanisms of thrombin inhibition by fibrin peptides, distinguishing between catalytic site blockade and other thrombin domain interactions.

Main Methods:

  • Amidolysis assays were used to assess thrombin catalytic activity.
  • Plasma and fibrinogen clotting assays were employed to evaluate the effects of fibrin peptides on coagulation.

Related Experiment Videos

  • Analog peptides of fibrin A alpha 17-23 (GPRVVER) and B beta 15-25 (GHRPLDKKREE) were synthesized and tested.

    • Main Results:

    • The peptide GPRVVER inhibited thrombin's catalytic site via hydrophobic interactions and also inhibited clotting.
    • Neither GPRP, VVER, nor B beta 15-25 analogs inhibited amidolysis.
    • Acyl-DKKREE promoted plasma clotting but inhibited fibrinogen clotting, and reversed heparin's anticoagulant effect.

    Conclusions:

    • Fibrin B beta 15-25 likely interacts with thrombin, potentially blocking the heparin-binding site.
    • Polymerizing fibrin initially binds thrombin at the catalytic site and exosite-1 via A alpha 17-50, and at another site via B beta 15-25.
    • Competition between fibrin polymerization and thrombin binding may dislodge thrombin, re-exposing its active sites and contributing to clot-bound thrombin's thrombogenicity.