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Related Experiment Video

Updated: Aug 24, 2025

Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE

Monitoring Activation of the Antiviral Pattern Recognition Receptors RIG-I And PKR By Limited Protease Digestion and Native PAGE

Published on: July 29, 2014

Nsp16 shields SARS-CoV-2 from efficient MDA5 sensing and IFIT1-mediated restriction.

Alina Russ¹, Sabine Wittmann¹, Yuta Tsukamoto²

¹Institute of Clinical and Molecular Virology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany.

|October 26, 2022

Summary

SARS-CoV-2

Keywords:

2′-O-methyltransferase IFIT1 MDA5 Nsp16 SARS-CoV-2

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Published on: November 1, 2011

Area of Science:

Virology
Immunology
Molecular Biology

Background:

Cellular methyltransferases cap mRNA 5' ends for translation and immune evasion.
Coronaviruses utilize viral 2'-O-methyltransferases to protect their RNA from host defenses.

Purpose of the Study:

To investigate the role of SARS-CoV-2's 2'-O-methyltransferase (Nsp16) in viral replication and immunogenicity.
To assess the potential of Nsp16 as a target for developing attenuated and immunogenic SARS-CoV-2 strains.

Main Methods:

Generation of recombinant SARS-CoV-2 with catalytically inactive Nsp16 (Nsp16mut).
Analysis of viral replication and immunogenicity in human lung epithelial cells.
Investigation of the roles of MDA5, type I interferon (IFN), and IFIT1 in the Nsp16mut response.

Main Results:

SARS-CoV-2 Nsp16mut showed slightly attenuated replication but significantly enhanced immunogenicity, with increased type I IFN release.
The heightened immunogenicity of Nsp16mut was dependent on the RNA sensor MDA5.
Nsp16mut was sensitive to type I IFN treatment, with IFIT1 mediating the antiviral effect.

Conclusions:

SARS-CoV-2 Nsp16 plays a dual role in evading MDA5 recognition and interferon-induced antiviral responses.
Nsp16 is a promising target for creating attenuated, highly immunogenic SARS-CoV-2 strains and for therapeutic intervention.