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Rotavirus SA11 genome segment 11 protein is a nonstructural phosphoprotein
S K Welch1, S E Crawford, M K Estes
1Division of Molecular Virology, Baylor College of Medicine, Houston, Texas 77030.
Journal of Virology
|September 1, 1989
Summary
Researchers identified rotavirus genome segment 11 protein, NS26, as a nonstructural phosphoprotein. This protein is phosphorylated and found in infected cells but not in purified rotavirus particles.
Area of Science:
- Virology
- Molecular Biology
- Protein Biochemistry
Background:
- Rotavirus genome segment 11 encodes a protein crucial for viral replication.
- Understanding viral protein functions is key to developing antiviral strategies.
Purpose of the Study:
- To characterize the rotavirus genome segment 11 protein.
- To determine its properties, cellular localization, and role in the viral life cycle.
Main Methods:
- Gene sequencing and cloning into baculovirus vector.
- Expression in insect cells and production of hyperimmune antiserum.
- Immunofluorescence, immunoprecipitation, immunoblotting, and plaque reduction neutralization assays.
Main Results:
- Identified a 26K primary translation product (NS26) and a modified 28K product.
- Both products are phosphorylated; NS26 is phosphorylated in insect and monkey kidney cells.
- NS26 localizes to cytoplasmic foci in infected cells and reacts with all rotavirus serotypes.
- Antiserum recognized NS26 in cytosol but not in purified virus particles; no neutralization of infectivity was observed.
Conclusions:
- The primary gene 11 product, NS26, is a nonstructural phosphoprotein.
- NS26 is involved in rotavirus replication but is not a structural component of the virion.
- NS26 may play a role in viral assembly or other nonstructural functions.