Related Experiment Videos
Isolation and characterization of single-chain protein S
F Meijer-Huizinga1, K Mertens, J A van Mourik
1Department of Blood Coagulation, Central Laboratory of The Netherlands, Amsterdam.
Thrombosis and Haemostasis
|September 1, 1994
Summary
Researchers developed a new method to isolate intact Protein S, a key blood clotting factor, directly from plasma. This novel affinity chromatography technique uses a specific monoclonal antibody to preserve Protein S
Area of Science:
- Biochemistry
- Hematology
- Immunology
Background:
- Protein S is a vitamin K-dependent protein crucial for regulating blood coagulation.
- It acts as a cofactor for activated protein C, inactivating coagulation factors Va and VIIIa.
- Protein S is susceptible to thrombin-induced proteolysis, reducing its functional activity and complicating purification.
Purpose of the Study:
- To develop a method for isolating intact, single-chain human Protein S from plasma.
- To utilize a monoclonal antibody targeting the thrombin-sensitive region for purification.
- To demonstrate the feasibility of a single-step purification process.
Main Methods:
- Affinity chromatography using a specific monoclonal antibody (CLB PS 52).
- The antibody targets an epitope within the thrombin-sensitive region of Protein S.
- Purification was performed directly from human plasma.
Main Results:
- Successfully isolated human single-chain, intact Protein S in a single step.
- The purified Protein S was cleaved by thrombin at Arg49, forming a two-chain molecule.
- The single-chain form exhibited higher reactivity with the monoclonal antibody CLB PS 52 compared to the two-chain form.
Conclusions:
- A novel method enables the direct isolation of intact Protein S from plasma.
- Monoclonal antibody CLB PS 52 effectively recognizes and binds uncleaved Protein S.
- This purification strategy preserves the functional integrity of Protein S, overcoming challenges of proteolytic degradation.