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Henipavirus V protein association with Polo-like kinase reveals functional overlap with STAT1 binding and interferon

Louise E Ludlow1, Michael K Lo, Jason J Rodriguez

  • 1Department of Medicine, Northwestern University, Evanston, Illinois 60208-3500, USA.

Journal of Virology
|April 18, 2008
PubMed

Insights

Henipavirus V proteins interact with host cell factors like STAT1 and Polo-like kinase 1 (PLK1) to evade immune responses. Disrupting these interactions may attenuate virus replication without affecting RNA synthesis.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • Henipavirus (a genus within Paramyxoviridae) are emerging viruses that cause severe disease.
  • These viruses employ strategies to evade host antiviral defenses, including interactions between viral proteins (V and W) and host factors (STAT1, STAT2, MDA5).
  • Polo-like kinase 1 (PLK1) has been identified as a novel cellular partner for Nipah virus (NiV) and Hendra virus (HeV) P, V, and W proteins.

Purpose of the Study:

  • To investigate the interaction between Henipavirus V proteins and PLK1.
  • To determine the functional significance of V protein interactions with PLK1 and STAT1 in viral replication and immune evasion.
  • To explore potential attenuation strategies for Henipavirus based on disrupting host-pathogen protein interactions.

Main Methods:

  • Protein-protein interaction studies using mutagenesis to identify binding motifs.
  • Assays to assess the impact of mutations on V protein phosphorylation, STAT1 binding, and interferon signaling.
  • Evaluation of the effect of mutations on NiV P protein-mediated viral RNA synthesis.

Main Results:

  • PLK1 binds to NiV V protein amino acids 100-160 (containing a Thr-Ser-Ser-Pro motif) and HeV V protein residue 199 (containing a Ser-Thr-Pro motif).
  • The NiV V protein interaction site for PLK1 overlaps with the STAT1 binding domain, crucial for interferon signaling evasion.
  • Mutations disrupting PLK1 or STAT1 binding sites on the V protein did not affect NiV P protein-mediated viral RNA synthesis, indicating independent functions.
  • V:PLK1 and V:STAT complexes are mediated by the V protein but function independently.

Conclusions:

  • The V protein of Henipavirus interacts with both STAT1 and PLK1 through distinct motifs.
  • These interactions are critical for evading host interferon responses but are separable from the V protein's role in viral RNA synthesis.
  • Targeting V protein-mediated evasion of host immunity by disrupting these protein interactions presents a viable strategy for Henipavirus attenuation without compromising viral replication capacity.

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