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Generation and Assembly of Virus-Specific Nucleocapsids of the Respiratory Syncytial Virus
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Critical phosphoprotein elements that regulate polymerase architecture and function in vesicular stomatitis virus.

Amal A Rahmeh1, Benjamin Morin, Andreas D Schenk

  • 1Department of Microbiology and Immunobiology, Harvard Medical School, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|August 22, 2012
PubMed
Summary

The phosphoprotein (P) cofactor is crucial for RNA-dependent RNA polymerase (RdRP) function in negative-sense RNA viruses. This study reveals specific P elements that rearrange the L protein, enhancing polymerase activity and viral RNA synthesis.

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Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Nonsegmented negative-sense RNA viruses utilize an RNA-dependent RNA polymerase (RdRP) for replication and transcription.
  • The RdRP complex comprises a large catalytic subunit (L) and a phosphoprotein cofactor (P).
  • Traditionally, P is viewed as a bridge connecting L to the viral nucleoprotein-RNA template.

Purpose of the Study:

  • To investigate the specific requirements within the P protein that mediate its functional interaction with the L protein.
  • To understand how P influences L conformation and stimulates RdRP activity.
  • To elucidate the role of P in viral RNA synthesis.

Main Methods:

  • Biochemical analysis of protein-protein interactions.
  • Structural studies to determine conformational changes.
  • Enzyme activity assays measuring RNA synthesis and processivity.

Main Results:

  • Identified three distinct elements within the P N-terminal domain (P(NTD)).
  • These P(NTD) elements are essential for inducing conformational changes in the L protein.
  • Demonstrated that these elements stimulate polymerase processivity and mediate transcription of the N-RNA complex.

Conclusions:

  • The phosphoprotein (P) acts as a dynamic regulator of RdRP function, not just a structural linker.
  • Specific elements within P(NTD) are critical for modulating L protein conformation and polymerase activity.
  • This detailed understanding of P-L interplay offers insights into viral RNA synthesis mechanisms.