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Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination

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Ubiquitination: A Double-Edged Mechanism in Coronavirus Infections.

Sijie Liu¹, Chuhan Shao², Yina Ding³

¹Department of Cell Biology, School of Life Sciences, Central South University, Changsha, China.

Journal of Medical Virology

|September 15, 2025

Summary

Coronaviruses, including SARS-CoV-2, manipulate ubiquitination, a protein modification, to advance infection. Understanding this interaction is key to developing new antiviral therapies targeting ubiquitination regulation.

Keywords:

coronavirus deubiquitination innate immunity protein posttranslational modification ubiquitination virus immune escape

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Area of Science:

Virology
Molecular Biology
Biochemistry

Background:

The COVID-19 pandemic, caused by SARS-CoV-2, has increased research into coronavirus pathogenesis.
Ubiquitination is a critical posttranslational modification involved in protein regulation.

Purpose of the Study:

To comprehensively examine the regulatory role of ubiquitination in coronavirus infections.
To explore how ubiquitination influences host-virus interactions during infection.
To identify potential therapeutic targets related to ubiquitination for controlling coronavirus infections.

Main Methods:

Literature review and analysis of existing research on ubiquitination and coronavirus interactions.
Examination of the host's and virus's manipulation of ubiquitination pathways.
Discussion of the implications for antiviral drug development.

Main Results:

Both host organisms and coronaviruses strategically utilize ubiquitination.
Hosts employ ubiquitination to activate immune responses and degrade viral proteins.
Coronaviruses subvert ubiquitination to evade host defenses and promote viral replication.

Conclusions:

Ubiquitination plays a dual role in coronavirus infections, influencing both host defense and viral pathogenesis.
Targeting ubiquitination pathways, potentially with PROTACs, offers a promising strategy for novel antiviral therapies against coronaviruses like SARS-CoV-2.