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Isolation and studies of myxovirus glycoproteins
Abstract:
The isolation of ortho- and paramyxovirus glycoproteins using a new nonionic detergent (MESK) is reported. MESK was shown to solubilize most of the viral envelope glycoproteins without decreasing their biologic activity. Solubilized glycoproteins are not contaminated by any internal viral proteins or by appreciable quantities of viral envelope lipids. The removal of MESK by dialysis resulted in the formation of glycoprotein micelles. The immunogenic activity of isolated glycoproteins was compared to that of virus particles. Immunization with isolated glycoproteins was shown to protect mice against a lethal influenza infection. Virions were treated with MESK in the presence of exogenous egg phosphatidylcholine, detergent was removed by dialysis and the glycoprotein was reconstituted in the vesicles. This reconstitution was accompanied by restoration of the haemolytic activity of Sendai virus proteins up to that of native virus particles. The level of activity, also the morphology and buoyant density of the vesicle were dependent on the protein/lipid ratio. MESK proved to be of value for the selective solubilization of the surface glycoproteins of animal enveloped viruses and their reconstitution in liposomes.
Insights
A new detergent, MESK, effectively isolates viral glycoproteins, preserving their biological activity. These isolated glycoproteins can be reconstituted into liposomes, demonstrating potential for vaccine development against enveloped viruses.
Area of Science:
- Virology
- Biochemistry
- Immunology
Background:
- Enveloped viruses possess surface glycoproteins crucial for infection.
- Isolating these glycoproteins while maintaining their biological function is challenging.
- Existing detergents can damage viral glycoproteins or lead to contamination.
Purpose of the Study:
- To report the isolation of ortho- and paramyxovirus glycoproteins using a novel nonionic detergent, MESK.
- To evaluate the biologic activity, purity, and immunogenicity of MESK-solubilized glycoproteins.
- To investigate the reconstitution of viral glycoproteins into liposomes.
Main Methods:
- Solubilization of viral envelope glycoproteins using MESK detergent.
- Purification of glycoproteins by removing internal proteins and lipids.
- Formation of glycoprotein micelles and reconstitution into liposomes via dialysis.
- Assessment of immunogenic activity and protective efficacy in mice.
- Restoration of haemolytic activity in reconstituted Sendai virus proteins.
Main Results:
- MESK selectively solubilized viral glycoproteins without loss of biologic activity.
- Isolated glycoproteins were free from internal viral proteins and lipids.
- Dialysis of MESK led to glycoprotein micelle formation.
- Immunization with isolated glycoproteins protected mice against influenza infection.
- Reconstitution into liposomes restored haemolytic activity of Sendai virus proteins, dependent on protein/lipid ratio.
Conclusions:
- MESK is a valuable tool for selective solubilization of enveloped virus surface glycoproteins.
- Isolated glycoproteins retain immunogenic and functional properties, suitable for vaccine research.
- Reconstitution of glycoproteins into liposomes offers a promising strategy for developing novel antiviral therapies and vaccines.