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Atomic structure of the open SARS-CoV-2 E viroporin.

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Area of Science:

  • Structural Biology
  • Virology
  • Biophysics

Background:

  • The SARS-CoV-2 envelope (E) protein forms cation channels in infected cells.
  • E protein's calcium channel activity is linked to COVID-19-induced inflammation.

Purpose of the Study:

  • To determine the open-state structure of the ETM in lipid bilayers.
  • To understand the mechanism of ion permeation through the ETM.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (ssNMR) spectroscopy was used.
  • The study analyzed the ETM's structure within lipid bilayers.

Main Results:

  • The open ETM structure features an amino-terminal chamber, a phenylalanine aromatic belt, and a constricted carboxyl-terminal pore.
  • Specific residues (glutamate, threonine, phenylalanine, arginine) are crucial for channel function and ion selectivity.
  • The structure elucidates how protons and calcium ions are selected and transported.

Conclusions:

  • The determined open-state ETM structure provides critical insights into viroporin ion channel function.
  • This structural information aids in understanding the molecular basis of SARS-CoV-2 pathogenesis and inflammation.
  • The findings may inform the development of antiviral strategies targeting E protein channels.