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Structural polypeptides of antigenically distinct strains of influenza B virus
Abstract:
Analyses of the polypeptide composition of influenza B viruses by 13 per cent SDS-polyacrylamide gel electrophoresis are reported. The viruses contained polypeptides of eight species ranging in molecular weight from 27,000 to 78,000. Four of them were glocypeptides and were selectively removed from the surface of the virion by Bromelain treatment. One of the blycopeptides was identified as viral neuraminidase. Three antigenically distinct strains of influenza virus, B/Lee/40, B/Massachusetts/1/71 and B/Hong Kong/5/72, showed an essentially identical electrophoretic picture, although strain-to-strain difference was observed in the migration rate of HA1 and HA2 polypeptides.
Insights
This study analyzed influenza B virus polypeptides using SDS-polyacrylamide gel electrophoresis, identifying eight protein species. Viral neuraminidase was among the surface glycoproteins, with minimal strain-to-strain variation observed.
Area of Science:
- Virology
- Biochemistry
- Molecular Biology
Background:
- Influenza B virus is a significant human pathogen.
- Understanding its polypeptide composition is crucial for vaccine development and antiviral strategies.
Purpose of the Study:
- To analyze the polypeptide composition of influenza B viruses.
- To identify viral surface glycoproteins and their properties.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was employed.
- Bromelain treatment was used to selectively remove surface glycoproteins.
Main Results:
- Influenza B viruses comprised eight polypeptide species (27,000-78,000 molecular weight).
- Four surface glycoproteins were identified, including viral neuraminidase.
- Three distinct influenza B strains exhibited similar electrophoretic profiles, with minor variations in HA1 and HA2 polypeptide migration.
Conclusions:
- The polypeptide composition of influenza B virus is highly conserved across different strains.
- SDS-PAGE is a valuable tool for characterizing influenza virus proteins.