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Functional significance of sialidase during influenza virus multiplication: an electron microscope study
Abstract:
Morphological evidence has been obtained by electron microscopy in support of previous findings that one of the most important functions of sialidase is associated with the release of virus from infected host cells. Highly specific antiserum against fowl plague virus enzyme and specific antiserum against X7 recombinant influenza virus enzyme were shown to influence the morphology of cells infected with their homologous virus. In the presence of enzyme antiserum, an accumulation and aggregation of virus particles were evident on the cell surface and in the extracellular space of infected host cells. The aggregation of virus particles was interpreted to result from the inhibition of the release of virus.
Insights
Sialidase plays a key role in virus release from host cells. Inhibiting this enzyme with specific antiserum causes virus particles to accumulate, confirming its function in viral egress.
Area of Science:
- Virology
- Cell Biology
- Enzymology
Background:
- Sialidase enzymes are implicated in various cellular processes.
- Previous research suggests a role for sialidase in viral release.
- Understanding viral egress mechanisms is crucial for antiviral strategies.
Purpose of the Study:
- To provide morphological evidence supporting the role of sialidase in virus release.
- To investigate the effect of specific antisera against viral sialidases on virus-host cell interactions.
Main Methods:
- Electron microscopy was employed to visualize infected host cells.
- Highly specific antisera against fowl plague virus enzyme and X7 recombinant influenza virus enzyme were used.
- Morphological changes in virus-infected cells were analyzed in the presence of antisera.
Main Results:
- Electron microscopy revealed significant accumulation and aggregation of virus particles.
- These aggregations were observed on the cell surface and in the extracellular space of infected cells treated with specific antiserum.
- The observed morphology suggests that sialidase inhibition interferes with virus release.
Conclusions:
- Morphological evidence strongly supports the function of sialidase in the release of virus from infected host cells.
- Specific antiserum targeting viral sialidase effectively inhibits virus particle release, leading to aggregation.
- These findings highlight sialidase as a critical factor in the viral replication cycle and a potential target for antiviral therapies.