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Immunoaffinity Purification of Factor IX (Christmas Factor) by Using Conformation-Specific Antibodies Directed against the Factor IX-Metal Complex

Howard A. Liebman, Steven A. Limentani, Barbara C. Furie and Bruce Furie
Proceedings of the National Academy of Sciences of the United States of America
Vol. 82, No. 11 (Jun. 1, 1985), pp. 3879-3883
Stable URL: http://www.jstor.org/stable/25774
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Immunoaffinity Purification of Factor IX (Christmas Factor) by Using Conformation-Specific Antibodies Directed against the Factor IX-Metal Complex
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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 NaDodSO4 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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