ZNRD2 Mediated Nucleoprotein Aggregation Impairs Respiratory Syncytial Virus Replication.

Area of Science:

• Virology
• Molecular Biology
• Immunology

Background:

• Nucleoproteins (N) of negative-sense RNA viruses oligomerize into ribonucleoprotein complexes.
• Understanding host-pathogen interactions is crucial for antiviral development.

Purpose of the Study:

• To identify host interactors of the respiratory syncytial virus (RSV) N protein.
• To elucidate the molecular mechanisms of RSV-host antagonism.

Main Methods:

• Immunoprecipitation coupled with mass spectrometry (IP-MS) to identify protein interactions.
• Assays to assess protein oligomerization, solubility, and complex formation.

Main Results:

• Zinc ribbon domain containing 2 (ZNRD2) was identified as an RSV N interactor.
• ZNRD2 acts as a restriction factor by enhancing N oligomerization and insolubility.
• RSV N sequesters ZNRD2, impairing its cellular functions; RSV phosphoprotein (P) inhibits this sequestration.
• RSV infection dynamically alters ZNRD2 solubility.

Conclusions:

• A dual antagonistic mechanism exists: ZNRD2 restricts RSV by aggregating with N, while RSV N sequesters ZNRD2, disrupting its function.
• This interaction provides insights into RSV pathogenesis and potential antiviral strategies.