Polypeptides of bovine rotavirus

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• Bovine rotavirus and neonatal calf diarrhoea virus (NCDV) are significant pathogens.
• Understanding viral protein structure and synthesis is crucial for developing control strategies.

Purpose of the Study:

• To characterize the polypeptide composition of bovine rotavirus and NCDV.
• To investigate the effect of trypsin on NCDV infectivity and polypeptide structure.
• To elucidate the intracellular synthesis of NCDV polypeptides.

Main Methods:

• Polyacrylamide gel electrophoresis (PAGE) to resolve viral polypeptides.
• In vitro trypsin treatment to assess infectivity and polypeptide changes.
• Pulse and pulse-chase experiments to study intracellular polypeptide synthesis.

Main Results:

• Eight distinct polypeptides were identified in bovine rotavirus/NCDV.
• The inner shell contained five polypeptides, and the outer shell contained three, with one glycosylated.
• Trypsin treatment enhanced NCDV infectivity, altered all eight polypeptides, and generated new bands.
• Infected cells synthesized all eight capsid proteins and three non-capsid polypeptides (NCVP).

Conclusions:

• All identified NCDV polypeptides are likely primary gene products with no post-synthesis processing.
• The findings provide insights into the structural and synthetic mechanisms of NCDV.