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Related Experiment Videos

Monoclonal antibodies to prothrombin.

O P Malhotra1, O Sudilovsky

  • 1Medical Research Service, Veterans Administration Medical Center, Cleveland, Ohio.

Thrombosis Research
|September 1, 1987
PubMed
Summary

Researchers developed monoclonal antibodies (McAb) using hybridoma technology to study bovine prothrombin. These antibodies differentiate between normal and abnormal prothrombin variants based on gamma-carboxyglutamyl (Gla) residue content and calcium ion dependency.

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Area of Science:

  • Immunology
  • Biochemistry

Background:

  • Bovine prothrombin is crucial in the coagulation cascade.
  • Understanding prothrombin structure-function relationships is vital for hemostasis research.
  • Monoclonal antibodies (McAb) offer precise tools for protein characterization.

Purpose of the Study:

  • To produce and characterize murine monoclonal antibodies against bovine normal prothrombin.
  • To investigate the role of calcium ions (Ca2+) in antibody-prothrombin interactions.
  • To assess antibody specificity towards prothrombin variants with varying gamma-carboxyglutamyl (Gla) residue content.

Main Methods:

  • Hybridoma technology for monoclonal antibody production.
  • Enzyme-Linked Immunosorbent Assay (ELISA) for antibody screening.
  • Affinity chromatography (Protein A-Sepharose) for antibody isolation.
  • Testing antibody binding to normal and dicoumarol-induced abnormal prothrombins with different Gla residues.

Main Results:

  • Twenty-four IgG1 monoclonal antibodies (McAb) were generated.
  • Nine Ca2+-independent McAb bound to prethrombin1 (P1) but not prothrombin fragment1 (F1).
  • Fifteen Ca2+-dependent McAb bound to F1 and differentiated abnormal prothrombins by Gla content, with varying affinities for 7-, 8-, and 9-Gla variants.

Conclusions:

  • Monoclonal antibodies can distinguish between prothrombin variants based on Gla residues and Ca2+ dependency.
  • Ca2+-dependent antibodies recognize the Ca2+-stabilized conformation of prothrombin.
  • Antibodies reacting with the Ca2+-stabilized conformation are not exclusively specific for normal prothrombin.

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