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SARS-CoV2 Nsp1 is a metal-dependent DNA and RNA endonuclease

Bruno A Salgueiro1, Margarida Saramago1, Mark D Tully2

  • 1ITQB-NOVA, Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avenida da República, 2780-157, Oeiras, Portugal.

Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
|March 28, 2024
PubMed

Insights

Severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) Nsp1 protein exhibits metal-dependent nuclease activity on RNA and DNA. This discovery reveals Nsp1 as a novel coronavirus nuclease with potential implications for viral infection mechanisms.

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) causes a global pandemic.
  • The Non-structural protein 1 (Nsp1) is a key virulence factor in coronaviruses, suppressing host protein translation.
  • Understanding SARS-CoV2 Nsp1 mechanisms is crucial for combating viral infections.

Purpose of the Study:

  • To investigate the biochemical and biophysical properties of SARS-CoV2 Nsp1.
  • To explore the influence of metal ions (calcium, magnesium, manganese) on Nsp1 activity.
  • To elucidate the molecular mechanisms underlying Nsp1's role in viral propagation.

Main Methods:

  • Biochemical and biophysical characterization of purified SARS-CoV2 Nsp1.
  • Assessment of Nsp1 binding affinities for manganese and calcium ions.
  • Enzymatic assays to determine Nsp1's nuclease activity on RNA and DNA, including a double variant (R124A/K125A).

Main Results:

  • SARS-CoV2 Nsp1 exists as a monomer in solution and binds strongly to manganese and calcium.
  • Nsp1 displays intrinsic metal-dependent endonucleolytic activity against both RNA and DNA.
  • A specific Nsp1 variant (R124A/K125A) shows abolished RNA but retained DNA nuclease activity, suggesting distinct substrate binding sites.

Conclusions:

  • SARS-CoV2 Nsp1 is identified as a novel nuclease within the coronavirus family.
  • Nsp1's nuclease activity is modulated by metal ions, highlighting their importance in viral infection.
  • These findings offer new insights into the multifaceted mechanisms of coronavirus pathogenesis.
Keywords:
BiophysicsCoronavirusMagnesiumManganeseNucleaseSAXS

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