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Viroporins: Structure, function, and their role in the life cycle of SARS-CoV-2

Ulrike Breitinger1, Noha S Farag2, Heinrich Sticht3

  • 1Department of Biochemistry, German University in Cairo, New Cairo, Egypt.

The International Journal of Biochemistry & Cell Biology
|February 27, 2022
PubMed

Insights

Viroporins, viral ion channels, are key to virus replication and COVID-19 pathogenesis. Understanding SARS-CoV-2 viroporins like E and ORF3a offers new antiviral drug targets.

Area of Science:

  • Virology
  • Molecular Biology
  • Biophysics

Background:

  • Viroporins are viral proteins forming ion channels essential for viral replication.
  • They disrupt cellular pH gradients and calcium homeostasis, influencing host-pathogen interactions.
  • Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) viroporins, E and ORF3a, are implicated in COVID-19's inflammatory cytokine storm.

Purpose of the Study:

  • To elucidate the structure, function, and role of viroporins in viral replication and inflammasome activation.
  • To discuss the contribution of SARS-CoV-2 viroporins to viral infection and pathogenesis.
  • To review potential impacts of viroporin sequence variations in SARS-CoV-2 variants of concern.

Main Methods:

  • Review of existing literature on viroporin structure and function.
  • Focus on cellular and electrophysiological assays for studying viroporin activity.
  • Analysis of SARS-CoV-2 viroporin sequences in variants of concern.

Main Results:

  • Viroporins modulate organelle pH and Ca2+ flux, interacting with host proteins and pathways.
  • SARS-CoV-2 E and ORF3a proteins act as viroporins, contributing to inflammatory responses in COVID-19.
  • Sequence variations in SARS-CoV-2 variants may alter E and ORF3a viroporin function.

Conclusions:

  • Viroporins are critical targets for antiviral drug development due to their essential role in viral replication.
  • Understanding SARS-CoV-2 viroporin mechanisms is crucial for combating the COVID-19 pandemic.
  • Further research into viroporin variants may inform therapeutic strategies against emerging SARS-CoV-2 strains.
Keywords:
ReviewSARSCoV-2Structure-function relationsViroporin activityViroporin assaysViroporins

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