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Function of PRRSV GP5 envelope protein by using pseudotyped virus.

Ping an Xia¹, Zhan guo Dang, Huang Qiu

¹Henan Agricultural University, Zhengzhou, China. xpa88@163.com

Veterinary Microbiology

|May 30, 2009

Summary

The porcine reproductive and respiratory syndrome virus (PRRSV) GP5 protein is crucial for viral entry. Researchers created GP5-pseudotyped viruses to study its function in infection and receptor binding.

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Area of Science:

Virology
Molecular Biology
Immunology

Background:

Porcine reproductive and respiratory syndrome virus (PRRSV) is an enveloped RNA virus.
PRRSV virions contain six membrane proteins, with GP5 being a major envelope protein involved in infectivity.
The specific role of GP5 in viral entry requires further elucidation.

Purpose of the Study:

To investigate the function of the GP5 envelope protein in viral entry.
To generate and characterize GP5-pseudotyped virus particles.
To assess the potential of GP5-pseudotyped viruses for receptor identification.

Main Methods:

Co-transfection of GP5 expression plasmids with murine leukemia virus (MuLV) based retroviral vectors into 293 T cells.
Analysis of pseudotyped virus particles using ultracentrifugation and Western blot.
Infection assays using PAM and Mack-145 target cells, followed by neutralization assays with PRRSV-specific antibodies.

Main Results:

GP5 was successfully incorporated into MuLV retroviral vectors, creating infectious GP5-pseudotyped viruses.
The pseudotyped virus exhibited infectivity towards PAM and Mack-145 cells, mirroring the host range of wild-type PRRSV.
Infection was effectively neutralized by antibodies targeting PRRSV or GP5, confirming GP5's role.

Conclusions:

The GP5 protein plays a significant role in PRRSV viral entry, likely through interaction with host cell receptors.
GP5-pseudotyped viruses are a valuable tool for identifying cellular receptors that bind to GP5.
This research provides insights into PRRSV pathogenesis and potential therapeutic targets.