Related Experiment Videos
Purification and characterization of measles virus haemagglutinin protein G
Abstract:
The 79 000 mol. wt. measles virion membrane glycoprotein G has been isolated from purified measles virus. Ultracentrifugation of 2% Triton X-100-treated measles virus produced a soluble supernatant fraction containing both G and F, the other external viral membrane protein. Lentil lectin-Sepharose and Sephacryl S-300 column chromatography of this fraction gave a pure preparation of G protein. Sucrose density-gradient centrifugation and SDS-polyacrylamide gel electrophoresis revealed that G was isolated from the virion membrane in the form of a disulphide-linked dimer. Antiserum prepared against purified G reacted only with the G polypeptide of measles virus in a slab gel antibody overlay technique. The antiserum also exhibited haemagglutination inhibition, virus neutralization and haemolysis inhibition activities.
Insights
Researchers isolated the measles virus glycoprotein G, a key viral component. This purified G protein was found to be a disulfide-linked dimer and generated an antiserum with potent virus-neutralizing capabilities.
Area of Science:
- Virology
- Immunology
- Protein Biochemistry
Background:
- Measles virus is a significant human pathogen.
- Understanding viral glycoproteins is crucial for developing effective vaccines and antiviral therapies.
- The measles virus membrane glycoprotein G plays a role in viral infection.
Purpose of the Study:
- To isolate and characterize the measles virus membrane glycoprotein G.
- To generate a specific antiserum against glycoprotein G.
- To evaluate the functional properties of the isolated glycoprotein G and its antiserum.
Main Methods:
- Purification of measles virus.
- Triton X-100 solubilization and ultracentrifugation.
- Lentil lectin-Sepharose and Sephacryl S-300 chromatography for protein isolation.
- Sucrose density-gradient centrifugation and SDS-polyacrylamide gel electrophoresis for characterization.
- Antibody overlay technique, haemagglutination inhibition, virus neutralization, and haemolysis inhibition assays.
Main Results:
- Successfully isolated the 79,000 mol. wt. measles virion membrane glycoprotein G.
- Glycoprotein G was purified as a disulfide-linked dimer from the viral membrane.
- Antiserum against purified G specifically recognized the G polypeptide and demonstrated significant haemagglutination inhibition, virus neutralization, and haemolysis inhibition activities.
Conclusions:
- The measles virus glycoprotein G can be purified as a disulfide-linked dimer.
- The generated antiserum against glycoprotein G is a potent inhibitor of measles virus infectivity and related processes.
- These findings contribute to the understanding of measles virus structure and provide a basis for further therapeutic and diagnostic development.