Isolation and characterization of single chain bovine factor V

Area of Science:

• Biochemistry
• Hematology
• Protein Chemistry

Background:

• Bovine Factor V plays a critical role in the blood coagulation cascade.
• Efficient isolation of functional Factor V is essential for research and potential therapeutic applications.

Purpose of the Study:

• To develop and characterize a procedure for the isolation of highly purified bovine Factor V.
• To elucidate the molecular properties and structure of isolated bovine Factor V.

Main Methods:

• Isolation involved multiple chromatographic and precipitation steps from bovine plasma.
• Inhibitors were used to prevent Factor V activation to Factor Va during purification.
• Characterization included electrophoretic techniques, sedimentation equilibrium, and sedimentation velocity studies.

Main Results:

• A novel isolation procedure yielded bovine Factor V with a 80-fold increase in activity upon thrombin activation.
• The specific activity of activated Factor V was 1250 units/mg protein.
• Bovine Factor V was identified as a single-chain glycoprotein (330,000 MW) with a highly asymmetric, rod-like structure (axial ratio 25:1).

Conclusions:

• The developed procedure effectively isolates functionally active bovine Factor V.
• Bovine Factor V is a large, single-chain glycoprotein with a pronounced asymmetric molecular shape.
• These findings contribute to a deeper understanding of Factor V structure and function in hemostasis.