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A simple two-step purification procedure for the iC3b binding collectin conglutinin
Thomas Krogh-Meibom1, Klaus Lønne Ingvartsen, Ida Tornoe
1Department of Animal Health and Bioscience, Faculty of Agricultural Sciences, Aarhus University, 8830 Tjele, Denmark.
Journal of Immunological Methods
|September 14, 2010
Summary
We developed a simple, two-step method to purify bovine conglutinin, a key innate immunity protein. This efficient process yields high-purity conglutinin, crucial for understanding complement system functions.
Area of Science:
- Immunology
- Biochemistry
Background:
- Bovine conglutinin is a serum protein vital for innate immunity.
- It binds calcium-dependently to iC3b, a complement C3 product on various surfaces.
Purpose of the Study:
- To present a simple and efficient two-step purification procedure for bovine conglutinin.
Main Methods:
- Incubation of bovine serum with TSK beads for complement activation and iC3b deposition.
- EDTA elution of conglutinin followed by ion-exchange chromatography for separation from iC3b and IgM.
Main Results:
- The procedure yielded 81 μg of conglutinin per ml of serum with 61.2% recovery.
- Purified conglutinin demonstrated high affinity for mannan (Kd=2.3-3.2 nM).
- SDS-PAGE and assays confirmed the absence of contamination from other serum collectins.
Conclusions:
- A straightforward and effective method for purifying bovine conglutinin has been established.
- The purified conglutinin exhibits functional binding properties and high purity.
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