Coagulation Factor IXa

Activation of Factor X by Factor IXa
The activation of factor X by the intrinsic factor Xase complex is shown. The intrinsic factor Xase complex consists of an enzyme, factor IXa, and a cofactor, factor VIIIa, assembled on a phospholipid surface in the presence of calcium ions. The enzyme complex proteolytically cleaves a 10,000 molecular weight activation peptide from the NH2-terminal of the heavy chain of factor X, thus expressing the active-site of factor Xa.

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  • Bovine factor IXa

    BCIXA-1050

    Price:$720.00/1 mg, $82.00/100 µg
    Size 1 mg, 100 µg
    Formulation 50% glycerol/water (v/v)
    Storage -20°C
    Shelf Life 12 months
    Purity >95% by SDS-PAGE
    Activity Determination Factor IX clotting assay
  • Bovine Factor IXa, DEGRck-active site blocked

    BCIXA-DEGR

    Price:$800.00/1 mg, $90.00/100 µg
    Size 1 mg, 100 µg
    Formulation 20 mM Hepes, 150 mM NaCl, pH 7.4
    Storage -80°C
    Shelf Life 12 months
    Purity >95% by SDS-PAGE
    Activity Determination Factor IX clotting assay
  • Bovine Factor IXa, EGRck-active site blocked

    BCIXA-EGR

    Price:$800.00/1 mg, $90.00/100 µg
    Size 1 mg, 100 µg
    Formulation 20 mM Hepes, 150 mM NaCl, pH 7.4
    Storage -80°C
    Shelf Life 12 months
    Purity >95% by SDS-PAGE
    Activity Determination Factor IX clotting assay

Factor IXa is produced from its inactive precursor, factor IX, via proteolytic cleavage by factor XIa or the tissue factor/factor VIIa/phospholipid complex. The activation results from the cleavage of two peptide bonds in the factor IX molecule, releasing an activation glycopeptide with an apparent molecular weight of 10,000. The heavy chain of factor IXa (Mr=28,000) contains the serine protease catalytic domain, while the light chain (Mr=17,000) contains the membrane binding domain.

Factor IXa functions as a serine protease involved in the activation of the zymogen, factor X, to form the enzyme, factor Xa. The factor IXa enzymatic activity is greatly enhanced by inclusion of its cofactor, factor VIIIa, in the presence of calcium ions on a phospholipid surface. Factor IXa is readily inhibited by antithrombin III, and this inhibition is greatly accelerated by the presence of heparin. Factor IXa is not inhibited by DFP.

Factor IXa is prepared from highly purified factor IX by activation with factor XIa, as described by Lindquist et al. (5). The factor IXa is further purified by gel filtration, followed by immunoaffinity purification. Factor IXa is also available with the active site irreversibly blocked by the tripeptide chloromethyl ketone, EGRck, or by the fluorescent inhibitor, Dansyl-EGRck. It is supplied in 50% (vol/vol) glycerol/H2O for storage at -20°C. Purity is assessed by SDS-PAGE analysis. Activity is determined in a one-stage clotting assay.

Sample gel image
GelNovex 4-12% Bis-Tris
LoadHuman Factor IXa, 1 µg per lane
BufferMOPS
StandardSeeBluePlus 2; Myosin (191 kDa), Phosphorylase B (97 kDa), BSA (64 kDa), Glutamic Dehydrogenase (51 kDa), Alcohol Dehydrogenase (39 kDa), Carbonic Anhydrase (28 kDa), Myoglobin Red (19 kDa), Lysozyme (14 kDa)
LocalizationPlasma
Mode of actionEnzyme component of the Factor Xase complex
Molecular weight45,000 (7)
Extinction coefficient
E
1 %
1 c m, 280 nm
= 14.0 (5)
Structure2 subunits, Mr=28,000 and 17,000 (5), NH2-terminal gla-domain, two EGF domains
Post-translational modificationsone b-hydroxyaspartate (3), twelve gla residues (4)
  1. 1. Thompson, A.R., Blood, 67, 565 (1986).
  2. Hedner, U., et al., In Hemostasis and Thrombosis, 2nd edition, ed. R.W. Colman, J. Hirsh, V.J. Marder, E.W.
  3. Salzman, pp., 39-47. J.P. Lippincott Co, Philadelphia, 1987.
  4. Discipio, R.G., et al., Biochemistry, 16, 698 (1977).
  5. McMullen, B.A., et al., BBRC, 115, 8 (1983).
  6. Lindquist, P.A., et al., J. Biol. Chem., 253, 1902 (1978).
  1. Li, Y., Nucleic Acids Research, 2006, Vol. 34, No. 22 (Aptimer interaction)
  2. Neuenschwander, P., et al., J Biol Chem. 2006 August 11; 281(32): 23066–23074. (Active site titration)

This publication list is not all encompassing, and is only meant to provide limited examples of how Prolytix products are used. We encourage you to search the literature for other examples pertinent to your experimentation, and to contact us with any technical questions.

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