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Multi-target Parallel Processing Approach for Gene-to-structure Determination of the Influenza Polymerase PB2 Subunit
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Influenza A Virus NS1 Protein Structural Flexibility Analysis According to Its Structural Polymorphism Using
Sarah Naceri1, Daniel Marc2,3, Anne-Claude Camproux1
1Université de Paris, CNRS, INSERM, Unité de Biologie Fonctionnelle et Adaptative, 75013 Paris, France.
International Journal of Molecular Sciences
|February 15, 2022
Summary
Influenza A virus non-structural protein 1 (NS1) exhibits flexibility, allowing it to evade host defenses. This study shows NS1 protein maintains three stable structural forms across different strains, influenced by linker length and amino acids.
Area of Science:
- Virology
- Structural Biology
- Computational Biology
Background:
- Influenza A viruses are contagious RNA viruses causing respiratory infections.
- The NS1 protein is crucial for counteracting host antiviral defenses.
- NS1 flexibility enables interactions with host proteins and RNAs.
Purpose of the Study:
- To investigate the dynamic and flexibility properties of NS1 from different Influenza A virus strains.
- To determine if NS1 protein maintains distinct structural conformations across various subtypes.
- To explore the influence of sequence variations and linker length on NS1 flexibility.
Main Methods:
- Computational molecular modeling was employed.
- Homology models were constructed for NS1 variants.
- Molecular dynamics simulations were performed to assess stability.
Main Results:
- NS1 protein demonstrated the co-existence of three stable structural forms across H1N1, H6N6, and H5N1 strains.
- Structural polymorphism was observed regardless of the specific influenza strain.
- Linker length and specific amino acids were identified as modulators of NS1 dynamic properties.
Conclusions:
- Influenza A virus NS1 protein exhibits inherent structural plasticity.
- The three distinct conformations of NS1 are stable and strain-independent.
- NS1 flexibility is fine-tuned by its linker region and amino acid composition, impacting viral evasion strategies.
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