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In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
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Integral membrane proteins are proteins adhered to the lipid bilayer of a cell organelle or membrane. They can be of two types: transmembrane integral proteins that span the lipid bilayer and monotopic proteins that are attached to either side of the membrane but do not pass through it.
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Dimeric Transmembrane Structure of the SARS-CoV-2 E Protein.

Rongfu Zhang1,2, Huajun Qin1, Ramesh Prasad3

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, FL, 32306, USA.

Communications Biology
|November 2, 2023
PubMed
Summary

The SARS-CoV-2 E protein is a dimer, not a pentamer, and lacks ion channel activity. Its structure reveals a potential drug-binding site, suggesting diverse functional roles for viral proteins.

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Area of Science:

  • Structural Biology
  • Virology
  • Biophysics

Background:

  • The SARS-CoV-2 E protein is a transmembrane protein with debated oligomeric state and function.
  • Previous studies suggested a pentameric structure with ion channel activity.

Purpose of the Study:

  • To characterize the transmembrane structure of the SARS-CoV-2 E protein.
  • To resolve the oligomeric state and functional implications of the E protein.

Main Methods:

  • Oriented sample and magic angle spinning solid-state NMR spectroscopy in lipid bilayers.
  • Molecular dynamics simulations for structural refinement.

Main Results:

  • Identified a symmetric helix-helix interface, forming a dimeric structure.
  • The dimeric structure does not support ion channel activity.
  • Discovered a water-filled pocket lined by Asn15, a potential drug-binding site.

Conclusions:

  • The SARS-CoV-2 E protein exists as a dimer, challenging previous pentameric models.
  • The dimeric structure suggests alternative functions beyond ion channel activity.
  • The identified drug-binding pocket offers a target for therapeutic intervention.