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Human coagulation factor IX. Isolation and characterization
European Journal of Biochemistry
|December 1, 1976
Summary
This study details the purification of human coagulation factor IX, a key protein in blood clotting. The research provides comprehensive molecular characterization of purified factor IX, establishing its homogeneity and key properties for future research.
Area of Science:
- Biochemistry
- Hematology
- Protein Chemistry
Background:
- Human coagulation factor IX is essential for the blood coagulation cascade.
- Understanding its molecular properties is crucial for treating bleeding disorders.
Purpose of the Study:
- To purify human coagulation factor IX to homogeneity.
- To characterize its molecular and physicochemical properties.
Main Methods:
- Multiple chromatography techniques including ion-exchange, heparin-Sepharose, hydroxyapatite, and immunoadsorbent chromatography.
- Electrophoresis (ordinary and SDS-PAGE), ultracentrifugation, N-terminal amino acid analysis, gel filtration, and isoelectric focusing.
- Antibody production and immunological assays for specificity.
Main Results:
- Factor IX was purified to homogeneity, confirmed by various analytical techniques.
- Molecular weight was determined to be approximately 66,100 Da by sedimentation equilibrium.
- Characterization revealed N-terminal tyrosine, specific carbohydrate content (hexose, N-acetylhexosamine, sialic acid), and microheterogeneity via isoelectric focusing (pI 4.0-4.6).
- The generated antibody showed high specificity for factor IX, with no cross-reactivity to other vitamin-K-dependent factors.
Conclusions:
- The study successfully purified and extensively characterized human coagulation factor IX.
- The detailed molecular data provide a foundation for further functional studies and therapeutic development.
- The high specificity of the antibody is valuable for diagnostic and research applications.