Grass carp reovirus-GD108 fiber protein is involved in cell attachment

Area of Science:

• Virology
• Molecular Biology
• Structural Biology

Background:

• Viral attachment to host receptors is crucial for initiating infection and determining target cell specificity.
• The outer capsid fiber protein of viruses plays a key role in this initial interaction.
• Understanding these proteins is vital for comprehending viral pathogenesis.

Purpose of the Study:

• To investigate the cell attachment functions of the outer capsid fiber protein of the grass carp reovirus GD108 strain (GCRV-GD108).
• To analyze the structural characteristics of the GCRV-GD108 fiber protein.
• To assess the potential of the fiber protein in inducing neutralizing antibodies.

Main Methods:

• Structural analysis of the GCRV-GD108 fiber protein.
• Neutralization assays using polyclonal antibodies against the fiber protein.
• Cell attachment assays with recombinant fiber protein and grass carp snout fibroblast cells (PSF).

Main Results:

• The GCRV-GD108 fiber protein shares structural similarities with mammalian reovirus σ1 and adenovirus fiber proteins.
• Polyclonal antibodies against the fiber protein neutralized GCRV-GD108 infection in fish and PSF cells.
• Recombinant fiber protein demonstrated binding to PSF cells, confirming its role in cell attachment.

Conclusions:

• The outer capsid fiber protein of GCRV-GD108 is essential for viral attachment to host cells.
• This fiber protein can elicit a neutralizing antibody response against GCRV-GD108.
• These findings lay the groundwork for further research into grass carp reovirus pathogenesis.