Abstract
Factor IX is a vitamin K-dependent blood clotting zymogen that is functionally defective or absent in patients with hemophilia B. A method of immunoaffinity chromatography has been developed for a one-step high yield purification of factor IX directly from plasma. The technique utilizes conformation-specific antibodies that bind solely to the metal-stabilized factor IX conformer, but not to the conformer of factor IX found in the absence of metal ions. Anti-factor IX-Ca(II) antibodies were immobilized on an agarose matrix. Human plasma in the presence of 7.5 mM MgCl2 was applied to the antibody-agarose column. The factor IX that binds to these antibodies was specifically eluted by metal chelation with EDTA. This immunopurification resulted in a 10,000-fold one-step purification of the fully functional zymogen. Purified factor IX yielded a single band upon gel electrophoresis in Na-DodSO4 and had a specific activity of 120-150 units/mg. The purified factor IX was separated from other vitamin K-dependent blood clotting proteins and hepatitis virus; no activated factor IX was detected. This method has application for the large scale purification of factor IX for the treatment of hemophilia B.
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