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Purification of rubella virus E1-E2 protein complexes by immunoaffinity chromatography
A P van Sommeren1, P A Machielsen, W J Schielen
1AKZO NOBEL, Organon Teknika B.V., Chemistry Research Unit, Boxtel, The Netherlands. tvsommeren@am.Otbc01.Umc.Akzonobel.Nl
Journal of Virological Methods
|January 1, 1997
Summary
Researchers developed a one-step immunoaffinity purification method using a monoclonal antibody to isolate rubella virus E1-E2 proteins. This technique yields highly purified, functional viral protein complexes suitable for diagnostic assays.
Area of Science:
- Virology
- Immunology
- Biochemistry
Background:
- Rubella virus E1 and E2 glycoproteins are crucial for viral assembly and infectivity.
- Efficient purification of these viral proteins is essential for developing diagnostic tools and understanding viral mechanisms.
Purpose of the Study:
- To develop and optimize a one-step immunoaffinity purification method for rubella virus E1-E2 protein complexes.
- To characterize the purity, yield, and functional activity of the purified viral proteins.
Main Methods:
- Immobilization of a murine monoclonal antibody against rubella virus E1 on an N-hydroxysuccinimide-activated chromatographic support.
- Immunoaffinity purification of E1-E2 protein complexes from viral extracts using batch and column methods.
- Optimization of adsorption parameters including ligand density, flow rate, bed height, and sample load.
- Characterization of the purified product using high-performance size exclusion chromatography, SDS-PAGE, immunoblotting, and electron microscopy.
Main Results:
- An optimized one-step immunoaffinity purification process achieved a 73% yield, 5-8 fold concentration factor, and approximately 2600-fold purification factor.
- The purified product consisted of rosette-like structures of E1-E2 protein complexes, free from detectable mouse IgG.
- The purified rubella virus proteins retained hemagglutinating activity.
Conclusions:
- The developed immunoaffinity purification method is reproducible, simple, and highly effective for isolating rubella virus E1-E2 protein complexes.
- The purified viral proteins are suitable for use in diagnostic assays, such as fluorescent enzyme immunoassays for detecting anti-rubella IgG in human serum.