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Nanobodies Targeting the GP4 Protein Inhibit PRRSV Replication
Wenxiang Zhang1, Aodi Wu1, Honghuan Li1
1College of Animal Science and Technology, Shihezi University, Shihezi 832003, China.
Microorganisms
|November 27, 2025
Summary
New nanobodies effectively inhibit Porcine reproductive and respiratory syndrome virus (PRRSV) infection. These novel agents target the PRRSV glycoprotein 4 (GP4), offering a promising therapeutic strategy against this economically damaging swine disease.
Area of Science:
- Veterinary Virology
- Immunotechnology
- Antiviral Drug Discovery
Background:
- Porcine reproductive and respiratory syndrome virus (PRRSV) causes significant global economic losses in the swine industry.
- Current therapeutic options for PRRSV are limited, necessitating the development of novel antiviral agents.
- The PRRSV structural glycoprotein 4 (GP4) is essential for viral entry and represents a potential therapeutic target.
Purpose of the Study:
- To isolate and characterize nanobodies targeting the PRRSV GP4.
- To investigate the antiviral mechanisms of these nanobodies against PRRSV infection.
- To evaluate the potential of these nanobodies as therapeutic agents for PRRSV.
Main Methods:
- Phage display technology was employed to isolate GP4-specific nanobodies.
- In vitro functional assays were conducted to assess the antiviral activity of the nanobodies.
- Mechanisms of viral suppression, including attachment and internalization inhibition, were investigated.
Main Results:
- Three nanobodies, Nb6, Nb31, and Nb85, were successfully isolated and demonstrated specificity for PRRSV GP4.
- These nanobodies significantly inhibited PRRSV infection in vitro.
- The nanobodies were found to disrupt both viral attachment to host cells and subsequent internalization.
Conclusions:
- Nb6, Nb31, and Nb85 nanobodies show significant potential as novel antiviral agents against PRRSV.
- Targeting PRRSV GP4 with nanobodies offers a promising strategy to combat PRRSV infection.
- Further development of these nanobodies could lead to effective therapeutics for the swine industry.
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