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Specific secretion of polypeptides from cells infected with myxoma virus
Abstract:
The polypeptides secreted from cells infected with myxoma virus have been studied. Three virus-induced polypeptides were detected. One major and one minor polypeptide were synthesized and secreted in the absence of virus DNA synthesis; one minor polypeptide was not detected in the medium under such conditions. All these polypeptides were glycosylated and one was sulphated. Two precipitin lines were seen in Ouchterlony tests examining medium from infected rabbit cells and using serum from rabbits convalescent from myxoma virus infections. These antigens were unrelated to the virus-specific antigens released from cells infected with vaccinia virus. No major differences were detected in comparisons between the polypeptides secreted from cells infected with virulent and relatively avirulent strains of myxoma virus.
Insights
Researchers studied polypeptides from myxoma virus-infected cells, identifying three virus-induced proteins. These secreted proteins were glycosylated and sulphated, with no significant differences observed between virulent and avirulent myxoma virus strains.
Area of Science:
- Virology
- Cell Biology
- Immunology
Background:
- Myxoma virus is an poxvirus known to cause significant morbidity and mortality in rabbits.
- Understanding virus-host interactions, particularly secreted viral proteins, is crucial for developing effective countermeasures.
- Previous studies have identified various viral proteins, but the specific secreted polypeptides and their modifications require further characterization.
Purpose of the Study:
- To identify and characterize polypeptides secreted by myxoma virus-infected rabbit cells.
- To investigate the synthesis and post-translational modifications (glycosylation, sulphation) of these secreted viral proteins.
- To compare the secreted polypeptide profiles between cells infected with virulent and avirulent myxoma virus strains.
Main Methods:
- Cell culture of rabbit cells infected with myxoma virus.
- Metabolic labeling and analysis of secreted polypeptides using SDS-PAGE.
- Detection of glycosylation and sulphation of viral polypeptides.
- Ouchterlony double diffusion assays using convalescent rabbit antiserum.
Main Results:
- Three distinct virus-induced polypeptides were detected in the culture medium.
- One major and one minor polypeptide were synthesized and secreted even without viral DNA replication.
- All detected secreted polypeptides were glycosylated, and one was also sulphated.
- Two specific antigens were identified in the medium, distinct from vaccinia virus antigens.
- No significant differences in secreted polypeptides were found between virulent and avirulent myxoma virus strains.
Conclusions:
- Myxoma virus infection leads to the secretion of specific, modified viral polypeptides.
- These secreted viral antigens are distinct from those of vaccinia virus.
- The observed secreted polypeptides are likely involved in virus pathogenesis or host immune response.
- The lack of difference between virulent and avirulent strains suggests these secreted proteins may not be the primary determinants of virulence.