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Updated: Oct 30, 2025

Visualization of SARS-CoV-2 using Immuno RNA-Fluorescence In Situ Hybridization
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Visualization of SARS-CoV-2 using Immuno RNA-Fluorescence In Situ Hybridization

Published on: December 23, 2020

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The Role of Coronavirus RNA-Processing Enzymes in Innate Immune Evasion

Georgia Mandilara1, Marianna A Koutsi2, Marios Agelopoulos2

  • 1National Reference Centre for Salmonella and Shigella, School of Public Health, University of West Attica, 11521 Athens, Greece.

Life (Basel, Switzerland)
|July 2, 2021
PubMed

Insights

Coronaviruses evade human antiviral defenses using enzymes like Nsp15 and Nsp16 to process viral RNA. Understanding these viral RNA processing mechanisms is key to developing new antiviral therapies.

Area of Science:

  • Virology
  • Immunology
  • Molecular Biology

Background:

  • Human innate immunity detects viral RNA, triggering antiviral responses like interferon production.
  • RNA viruses, including coronaviruses, possess mechanisms to evade these immune defenses.
  • Coronaviruses utilize enzymes such as Nsp15 and Nsp16 for viral RNA synthesis, modification, and processing.

Purpose of the Study:

  • To review human RNA-sensing mechanisms.
  • To discuss structural, functional, and evolutionary aspects of coronavirus Nsp15 and Nsp16.
  • To explore potential antiviral strategies targeting these viral RNA processing enzymes.

Main Methods:

  • Literature review of RNA sensing pathways.
  • Analysis of structural and functional data for Nsp15 and Nsp16.
  • Examination of evolutionary studies on Nidovirus genome expansion and RNA processing activities.

Main Results:

  • Nsp15 and Nsp16 are critical for coronavirus immune evasion through dsRNA degradation and RNA capping.
  • Evolutionary analysis links Nsp14-ExoN activity to genome expansion and acquisition of Nsp15/Nsp16 functions.
  • These enzymes are central to the coronavirus lifecycle and immune suppression.

Conclusions:

  • Coronavirus Nsp15 and Nsp16 play vital roles in evading host immune surveillance.
  • Targeting these essential viral RNA processing enzymes offers a promising avenue for antiviral drug development.
  • Further research into the structure-function relationships of Nsp15 and Nsp16 can guide the design of novel therapeutics.
Keywords:
SARS-CoV-2coronavirusimmune evasioninnate immunityviral RNA sensing

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