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A core network in the SARS-CoV-2 nucleocapsid NTD mediates structural integrity and selective RNA-binding.

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • The SARS-CoV-2 nucleocapsid protein (N) is vital for viral RNA genome processing.
  • The N-terminal domain (NTD) of the nucleocapsid protein is implicated in specific RNA interactions, but high-resolution structures are limited.
  • The precise mechanism of NTD-RNA complex formation and the impact of emerging mutations remain unclear.

Purpose of the Study:

  • To investigate the structural integrity and RNA-binding properties of the SARS-CoV-2 nucleocapsid protein NTD.
  • To elucidate the molecular impact of NTD mutations on protein stability and RNA interactions.
  • To understand the role of conserved residues in NTD function and evolution.

Main Methods:

  • X-ray crystallography
  • Solution Nuclear Magnetic Resonance (NMR) spectroscopy
  • Structural analysis of NTD mutations

Main Results:

  • A core network of conserved residues is essential for NTD structural integrity and RNA binding.
  • This network facilitates communication between flexible loop regions involved in RNA recognition.
  • Mutations within this core network significantly affect protein stability and RNA-binding capabilities.

Conclusions:

  • The conserved core residue network is critical for the stability and plasticity of the nucleocapsid NTD.
  • This network underpins the protein's selective RNA interactions and versatile RNA processing roles.
  • The findings provide insights into the evolutionary robustness of the nucleocapsid NTD in Betacoronaviruses.