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Evidence for functional protein interactions required for poliovirus RNA replication

Natalya L Teterina1, Eric Levenson, Mario S Rinaudo

  • 1Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Diseases/NIH, Bldg. 50, 50 South Drive, Bethesda, MD 20892-8011, USA.

Journal of Virology
|May 16, 2006
PubMed

Insights

Researchers engineered poliovirus with a human rhinovirus helix, causing replication defects. Compensatory mutations in other viral proteins (3A, 2B) and their direct binding were identified, revealing complex viral protein interactions.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Poliovirus protein 2C has an N-terminal amphipathic helix crucial for viral RNA replication complex membrane association.
  • Understanding protein interactions is key to viral replication mechanisms.

Purpose of the Study:

  • To investigate the role of the poliovirus 2C N-terminal amphipathic helix in viral RNA replication.
  • To identify viral proteins that interact with and potentially compensate for alterations in protein 2C.

Main Methods:

  • Construction of a chimeric poliovirus incorporating the human rhinovirus type 14 (HRV14) 2C amphipathic helix.
  • Generation and characterization of viral variants with improved growth properties.
  • Sequence analysis and genomic reconstruction to identify compensatory mutations.
  • Mammalian cell two-hybrid analysis to confirm direct protein-protein binding.

Main Results:

  • The chimeric virus showed impaired viral RNA replication and produced minute plaques.
  • Subsequent viral passages yielded large plaque variants, with most mutations occurring outside the 2C-encoding region.
  • Mutations in viral proteins 3A or 2B compensated for the HRV14 amphipathic helix substitution in protein 2C.
  • Direct binding was confirmed between poliovirus proteins 2B, 3A, and 2C.

Conclusions:

  • The N-terminal amphipathic helix of poliovirus 2C is essential for efficient viral RNA replication.
  • Viral proteins 3A and 2B can functionally compensate for alterations in the 2C amphipathic helix.
  • These findings highlight functional interactions and direct binding among poliovirus 2B, 3A, and 2C proteins during replication.

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