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Structure-function mapping and mechanistic insights on the SARS CoV2 Nsp1.

Bruno A Salgueiro1, Margarida Saramago1, Mark D Tully2

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

Protein Science : a Publication of the Protein Society
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Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV2) Nsp1 protein

Keywords:
SDSbiophysical characterizationfluorescence spectroscopymetalsnucleasetyrosyl radical

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Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV2) non-structural protein 1 (Nsp1) is crucial for COVID-19 pathogenesis.
  • Previous research identified Nsp1 as a metal-dependent DNA and RNA endonuclease, active independently of the ribosome.

Purpose of the Study:

  • To delineate the distinct functional roles of the N-terminal domain (NTD) and C-terminal domain (CTD) of SARS-CoV2 Nsp1.
  • To investigate the involvement of a specific residue, Y136, in the nuclease activity of Nsp1.

Main Methods:

  • Generation and analysis of four truncated Nsp1 constructs (NTD-only and CTD-only).
  • Biochemical assays to assess nuclease activity of wild-type and Y136F mutant Nsp1 variants.
  • Characterization of the Nsp1 CTD's interaction with hydrophobic environments.

Main Results:

  • The NTD is implicated in nucleotide binding and regulation, while the CTD functions as the catalytic domain.
  • A tyrosyl radical is detected during nuclease activity, with Y136 specifically required for DNA but not RNA degradation.
  • The Nsp1 CTD exhibits affinity for hydrophobic environments, suggesting potential membrane association.

Conclusions:

  • SARS-CoV2 Nsp1 possesses distinct functional domains (NTD for regulation, CTD for catalysis) essential for its nuclease activity.
  • The Y136 residue plays a critical role in Nsp1's DNA degradation function.
  • The CTD's hydrophobic interactions may indicate a role in viral-host cell membrane interactions.