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Binding interactions between the encephalomyocarditis virus leader and protein 2A.

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Cardiovirus leader (L) and 2A proteins cooperate to inhibit host cell functions. Their interaction facilitates nuclear transport and host protein binding, influencing viral pathogenesis.

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Area of Science:

  • Virology
  • Molecular Biology
  • Protein-protein interactions

Background:

  • Cardioviruses encode leader (L) and 2A proteins crucial for pathogenesis.
  • These proteins independently target host cell processes like nucleocytoplasmic trafficking and translation.
  • L and 2A proteins interact with each other, a cooperation essential for their functions during infection.

Purpose of the Study:

  • To elucidate the cooperative mechanism between cardiovirus L and 2A proteins.
  • To understand how L and 2A interaction influences viral pathogenesis and host cell manipulation.
  • To investigate the binding affinities and domains involved in L-2A complex formation.

Main Methods:

  • Recombinant protein expression and interaction studies.
  • Determination of binding affinity (KD) and stoichiometry.
  • Mapping of protein contact domains using biochemical assays.
  • Investigation of Ran GTPase displacement of 2A from L.

Main Results:

  • Recombinant L and 2A proteins interact with 1:1 stoichiometry and a KD of 1.5 μM.
  • The amino-proximal third of 2A and the central hinge region of L form the contact interface.
  • Ran GTPase can displace 2A from L in the nucleus.
  • Similar interactions observed across different cardiovirus subtypes (TMEV, Saffold virus).

Conclusions:

  • L protein utilizes 2A's nuclear localization signal for nuclear import.
  • In the nucleus, L exchanges 2A for Ran GTPase, modulating host pathways.
  • This cooperative mechanism explains the codependent phenotypes of L and 2A mutations in cardiovirus infections.
  • Understanding this interaction is vital for studying cardiovirus pathogenesis, including TMEV models for multiple sclerosis.