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Published on: June 3, 2012
Peptide-Mediated Interference of PB2-eIF4G1 Interaction Inhibits Influenza A Viruses' Replication in Vitro and in
Shuofeng Yuan1, Hin Chu1, Jiahui Ye1
1Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong , Hong Kong SAR, China.
Abstract:
Influenza viruses are obligate parasites that hijack the host cellular system. Previous results have shown that the influenza virus PB2 subunit confers a dependence of host eukaryotic translation initiation factor 4-γ 1 (eIF4G1) for viral mRNA translation. Here, we demonstrated that peptide-mediated interference of the PB2-eIF4G1 interaction inhibited virus replication in vitro and in vivo. Remarkably, intranasal administration of the peptide provided 100% protection against lethal challenges of influenza A viruses in BALB/c mice, including H1N1, H5N1, and H7N9 influenza virus subtypes. Mapping of the PB2 protein indicated that the eIF4G1 binding sites resided within the PB2 cap-binding domain. Virtual docking analysis suggested that the inhibitory peptide associated with the conserved amino acid residues that were essential to PB2 cap-binding activity. Overall, our results identified the PB2-eIF4G1 interactive site as a druggable target for influenza therapeutics.
Insights
A novel peptide targeting the influenza virus PB2-eIF4G1 interaction effectively inhibited viral replication. Intranasal peptide administration offered complete protection against lethal influenza A virus challenges in mice.
Area of Science:
- Virology
- Molecular Biology
- Drug Discovery
Background:
- Influenza viruses are obligate intracellular parasites that exploit host cellular machinery for replication.
- The viral PB2 subunit is known to interact with the host translation initiation factor 4-gamma 1 (eIF4G1), facilitating viral mRNA translation.
Purpose of the Study:
- To investigate the functional significance of the PB2-eIF4G1 interaction in influenza virus replication.
- To evaluate the therapeutic potential of targeting this interaction using peptide-mediated interference.
Main Methods:
- Peptide synthesis to interfere with the PB2-eIF4G1 complex.
- In vitro assays to assess inhibition of viral replication.
- In vivo studies involving intranasal administration in a mouse model (BALB/c).
- Protein mapping and virtual docking to identify binding sites and mechanisms.
Main Results:
- Peptide-mediated interference significantly inhibited influenza virus replication both in vitro and in vivo.
- Intranasal administration of the peptide conferred 100% protection against lethal challenges with H1N1, H5N1, and H7N9 influenza A virus subtypes.
- The eIF4G1 binding site on PB2 was mapped to the cap-binding domain, crucial for viral RNA binding.
Conclusions:
- The PB2-eIF4G1 interaction is a critical host factor for influenza virus replication.
- Targeting the PB2-eIF4G1 interface with peptides represents a promising therapeutic strategy against influenza.
- The identified interaction site is a druggable target for developing novel anti-influenza drugs.
