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Structural basis for the multimerization of nonstructural protein nsp9 from SARS-CoV-2.

Changhui Zhang1, Yiping Chen1, Li Li1

  • 1State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, and Collaborative Innovation Center for Biotherapy, Chengdu, 610041 PR China.

Molecular Biomedicine
|November 12, 2021
PubMed
Summary

Researchers determined the structure of SARS-CoV-2 nonstructural protein 9 (nsp9), an essential RNA-binding protein for coronavirus replication. This finding provides a structural basis for understanding viral RNA replication and transcription regulation.

Keywords:
COVID-19SARS-CoV-2Tetramernsp9

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) causes the COVID-19 pandemic, a major global health concern.
  • Coronaviruses (CoVs) possess large RNA genomes that rely on a replication/transcription complex for duplication.
  • Nonstructural proteins (Nsps) are crucial for assembling this complex and facilitating viral genomic replication.

Purpose of the Study:

  • To determine the three-dimensional structure of SARS-CoV-2 nonstructural protein 9 (nsp9).
  • To elucidate the structural basis for nsp9's self-assembly and its role in viral RNA replication.

Main Methods:

  • X-ray crystallography was used to determine the structure of SARS-CoV-2 nsp9.
  • Analysis of the protein's quaternary structure and interfaces.

Main Results:

  • The structure of SARS-CoV-2 nsp9 was determined.
  • Nsp9 forms a homotetrameric structure characterized by two stable dimeric interfaces.
  • This structure offers insights into the self-assembly mechanisms of RNA-binding proteins.

Conclusions:

  • The homotetrameric structure of SARS-CoV-2 nsp9 provides a structural foundation for understanding its function.
  • Understanding nsp9's self-assembly is critical for regulating viral RNA replication and transcription.
  • This research contributes to the broader understanding of coronavirus replication mechanisms.