Factor IX Polyclonal Antibody – Affinity Purified – FITC Conjugated
Affinity’s Factor IX Polyclonal Antibody – Affinity Purified – FITC Conjugated is the highest level of our Fluorescein Isothiocyanate (FITC) Factor IX antibodies. During the Antigen Affinity Purification process the IgG has had any non-specific immunoglobulin fraction eliminated which enriches the specificity of the remaining immunoglobulin towards the target antigen. The result is a very high-purity product with a substantially higher titre than whole or purified IgG. Our Factor IX Polyclonal Antibody – Affinity Purified – FITC Conjugated is provided in a solution of HEPES buffered saline containing 50% glycerol (v/v) and has been conjugated with FITC as an enzyme reporter. This antibody is generally intended for use as labelled primary antibodies in applications such as immunoassay and immunoblotting.
Product Code: GAFIX-APFTC
Retail Product Size: 0.1mg vial
Host Animal: Goat Anti-Human Factor IX Polyclonal Antibody – Affinity Purified – FITC Conjugated
Species Cross Reactivity: View Chart
Description of Factor IX (FIX)
Factor IX (FIX, Christmas Factor) is a vitamin K-dependent glycoprotein produced in the liver. Plasma concentration of FIX is normally around 5 μg/ml (87 nM) in plasma. The biological importance of FIX is demonstrated in Haemophilia B (Christmas disease), an X-linked congenital bleeding disease resulting from a quantitative (low activity and low antigen) or qualitative (low activity, normal antigen) defect in FIX function.
In its proenzyme or zymogen form FIX is a single chain molecule of 55,000 daltons. It contains two EGF-like domains and an amino-terminal domain containing 12 γ-carboxy-glutamic acid (Gla) residues. These Gla residues allow FIX to bind divalent metal ions and participate in calcium-dependent binding interactions. The activation of F.IX occurs by limited proteolysis in the presence of calcium by activated factor XI (FXIa) and/or by a complex of VIIa/tissue factor/phospholipid and activated Factor X between residues Arg146-Ala147 and between Arg180-Val181. The terminal activated product in either case is FIXaβ, a two-chain enzyme consisting of a heavy chain (28,000 daltons), a light chain (18,000 daltons) and an activation peptide product of 11,000 daltons. FIX can also be cleaved into inactive products by thrombin and by elastase.
The activity of FIXaβ in plasma is inhibited by antithrombin and this inhibition is accelerated 1000-fold in the presence of optimal concentrations of heparin 1-3.
References and Reviews
- Lawson, JH, Mann KG; Cooperative Activation of Human F.IX by the Human Extrinsic Pathway of Coagulation; JBC 266 pp11317-11327, 10991.
- Enfield DL, Thompson AR; Cleavage and Activation of Factor IX by Serine Proteases; Blood 64, pp 821-831, 1984.
- Limentani SA, Furie BC, Furie B, in Hemostasis and Thrombosis, 3rd Edition, eds. RW Colman, J Hirsh, VJ Marder and EW Salzman, pp. 94-108, J.B. Lippincott Co., Philadelphia PA, USA, 1994