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Updated: Jan 26, 2026

Probing the Limits of Egg Recognition Using Egg Rejection Experiments Along Phenotypic Gradients
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Probing prothrombin structure by limited proteolysis.

Laura Acquasaliente1, Leslie A Pelc1, Enrico Di Cera2

  • 1Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO, 63104, USA.

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Prothrombin (coagulation factor II) exists in open and closed forms, influencing its activation pathway. Stabilizing the open form shifts activation from meizothrombin to prethrombin-2, revealing key molecular details.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hemostasis

Background:

  • Prothrombin (coagulation factor II) is a key zymogen in blood coagulation.
  • It exists in an allosteric equilibrium between open and closed conformations.
  • These conformations differentially interact with prothrombinase, affecting activation pathways.

Purpose of the Study:

  • To investigate the structural basis of prothrombin's conformational equilibrium.
  • To understand how this equilibrium influences the choice of activation pathway.
  • To identify key residues involved in allosteric regulation.

Main Methods:

  • Limited proteolysis using chymotrypsin to probe conformational states.
  • Site-specific cleavage analysis at R320 (meizothrombin pathway) and R271 (prethrombin-2 pathway).
  • Perturbation studies involving selective domain removal (Gla, kringles, linkers).

Main Results:

  • Chymotrypsin selectively cleaves W468 in the open conformation, not the closed form.
  • Removal of domains reveals long-range communication influencing the open-closed equilibrium.
  • Stabilization of the open form redirects activation from meizothrombin to prethrombin-2.
  • Residue R296 is identified as critical for linking allosteric state to cleavage site accessibility.

Conclusions:

  • Prothrombin's conformational dynamics are crucial for regulating its activation.
  • Specific structural elements and residues mediate the allosteric control of activation pathways.
  • These findings provide new insights into the molecular mechanisms of blood coagulation initiation.