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Regulation of influenza A virus nucleoprotein oligomerization by phosphorylation

Lauren Turrell1, Edward C Hutchinson1, Frank T Vreede2

  • 1Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom.

Journal of Virology
|October 31, 2014
PubMed

Insights

Phosphorylation of influenza A virus nucleoprotein at serine 165 blocks its oligomerization, inhibiting viral activity and growth. This suggests reversible phosphorylation regulates nucleoprotein function during infection.

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • The influenza virus ribonucleoprotein complex is essential for viral replication.
  • Nucleoprotein (NP) oligomerization is a key process mediated by specific molecular interactions.

Purpose of the Study:

  • To investigate the role of nucleoprotein phosphorylation in regulating its oligomerization and function.
  • To determine the impact of serine 165 phosphorylation on influenza A virus replication.

Main Methods:

  • Site-directed mutagenesis to create non-phosphorylatable nucleoprotein mutants.
  • In vitro assays to assess nucleoprotein oligomerization.
  • Viral growth assays to measure replication efficiency.

Main Results:

  • Phosphorylation of serine 165 (S165) in the influenza A virus nucleoprotein groove inhibits NP oligomerization.
  • Inhibition of oligomerization leads to reduced ribonucleoprotein complex activity.
  • S165 phosphorylation impairs viral growth and replication.

Conclusions:

  • Reversible phosphorylation of influenza A virus nucleoprotein at S165 is a critical regulatory mechanism.
  • Phosphorylation-mediated inhibition of NP oligomerization impacts viral fitness.
  • Targeting NP phosphorylation could be a strategy for antiviral development.

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