Soluble recombinant influenza vaccines.
1Laboratory of Molecular Biology, University of Ghent and Flanders Interuniversity Institute for Biotechnology, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium. fiers@dmb.rug.ac.be
Summary
Recombinant influenza A virus proteins, including neuraminidase and the conserved M2e protein, were engineered to enhance immunogenicity. M2e fusion proteins induced complete, strain-independent protection in mice, showing promise for universal influenza vaccines.
Area of Science:
- Virology
- Immunology
- Biotechnology
Background:
- Influenza A virus poses a significant global health threat.
- Recombinant viral proteins are explored as vaccine candidates.
- Engineering protein structure can enhance immunogenicity and protective efficacy.
Purpose of the Study:
- To develop novel influenza A virus vaccine candidates using recombinant protein technology.
- To investigate the immunogenicity and protective capacity of engineered haemagglutinin, neuraminidase, and M2e proteins.
- To assess strain-specific versus strain-independent protection.
Main Methods:
- Production of soluble, recombinant influenza A virus haemagglutinin and neuraminidase in lower eukaryotes.
- Engineering of neuraminidase by fusing its head region to a tetramerizing leucine zipper.
- Fusion of the M2 extracellular domain (M2e) to hepatitis B virus core protein and a tetramerizing leucine zipper.
Main Results:
- Soluble neuraminidase variants showed reduced immunogenicity with decreasing oligomeric state (tetra > di > mono).
- Engineered tetrameric neuraminidase was enzymatically active but induced strain-specific immunity.
- M2e-hepatitis B virus core protein fusion particles induced complete, strain-independent, long-lasting protection in a mouse model.
Conclusions:
- Engineering protein structure, such as M2e fusion proteins, can significantly enhance vaccine efficacy against influenza A virus.
- The M2e protein's conserved nature and the efficacy of M2e-based vaccines suggest potential for broad-spectrum influenza protection.
- Further evaluation of engineered M2e constructs is warranted for vaccine development.
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