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Related Experiment Videos

Exosites determine macromolecular substrate recognition by prothrombinase

S Krishnaswamy1, A Betz

  • 1Department of Medicine, Division of Hematology/Oncology, Emory University, Atlanta, Georgia 30322, USA. skris01@emory.edu

Biochemistry
|October 7, 1997
PubMed
Summary

Prothrombinase complex specificity for macromolecular substrates relies on exosites, not just the active site. Targeting these exosites offers new therapeutic inhibition strategies for blood coagulation disorders.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hemostasis

Background:

  • The prothrombinase complex (factor Xa and factor Va) is crucial for thrombin generation in blood coagulation.
  • The molecular mechanisms governing its substrate specificity are not fully understood.

Purpose of the Study:

  • To elucidate the molecular basis of prothrombinase complex's macromolecular substrate specificity.
  • To investigate the roles of active site and exosites in substrate recognition and binding.

Main Methods:

  • Kinetic studies of prethrombin 2 cleavage by prothrombinase.
  • Investigated substrate binding in the presence and absence of fragment 1.2 and inhibitors.

Main Results:

  • Substrate affinity is primarily determined by exosite interactions, distinct from the active site.

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  • Active site occupation does not affect affinity for prethrombin 2.
  • Exosite binding is crucial for specificity and can be targeted for inhibition.

    • Conclusions:

    • Prothrombinase specificity is mediated by exosites, not solely the active site.
    • Exosite interactions are key for initial substrate recognition and affinity.
    • Targeting exosites offers alternative therapeutic strategies for coagulation modulation.