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Related Experiment Videos

Coronavirus nucleocapsid protein. RNA interactions

R Cologna1, B G Hogue

  • 1Division of Molecular Virology, Houston, Texas, USA.

Advances in Experimental Medicine and Biology
|October 23, 1998
PubMed
Summary

The bovine coronavirus (BCV) nucleocapsid (N) protein binds to viral RNA, including specific packaging signals from mouse hepatitis coronavirus (MHV). This interaction is crucial for coronavirus RNA packaging.

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Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • The coronavirus nucleocapsid (N) protein plays a key role in encapsidating and packaging viral RNA.
  • Understanding N protein interactions with viral RNA is essential for comprehending coronavirus replication and assembly.

Purpose of the Study:

  • To investigate the RNA-binding capabilities of the bovine coronavirus (BCV) N protein.
  • To determine if BCV N protein interacts with specific coronavirus RNA elements, including packaging signals.

Main Methods:

  • Bacterial expression and purification of histidine-tagged BCV N protein (his-N).
  • Development of a filter binding assay to quantify his-N binding to various RNA molecules.
  • Testing binding affinities with BCV RNA, mouse hepatitis coronavirus (MHV) RNA, non-coronavirus RNA, a BCV defective genome (pDrep), and MHV packaging signal transcripts.

Main Results:

  • Bacterially expressed his-N protein demonstrated binding to both BCV and MHV RNAs.
  • Binding efficiency was significantly higher for BCV and MHV RNA transcripts compared to non-coronavirus RNA.
  • His-N protein showed similar binding efficiencies for a BCV defective genome and an MHV packaging signal transcript.
  • The entire MHV defective interfering particle genome (pMIDI-C) was bound with higher efficiency than the packaging signal alone.

Conclusions:

  • The BCV N protein exhibits RNA-binding activity, interacting with homologous and heterologous coronavirus RNAs.
  • This study provides evidence for the interaction of the N protein with the MHV packaging signal, a critical element for viral assembly.
  • The findings contribute to understanding the molecular mechanisms of coronavirus RNA packaging and host-pathogen interactions.

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