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Related Experiment Video

Updated: Sep 2, 2025

A Fluorogenic Peptide Cleavage Assay to Screen for Proteolytic Activity: Applications for coronavirus spike protein activation

A Fluorogenic Peptide Cleavage Assay to Screen for Proteolytic Activity: Applications for coronavirus spike protein activation

Published on: January 9, 2019

Coronaviruses exploit a host cysteine-aspartic protease for replication.

Hin Chu^1,2,3,4, Yuxin Hou⁵, Dong Yang⁵

¹State Key Laboratory of Emerging Infectious Diseases, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, China. hinchu@hku.hk.

|August 3, 2022

Summary

This summary is machine-generated.

Coronaviruses exploit the host apoptosis pathway by using caspase-6 to cleave viral proteins. This process generates fragments that block the immune response, enhancing virus replication and pathogenesis.

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Last Updated: Sep 2, 2025

A Fluorogenic Peptide Cleavage Assay to Screen for Proteolytic Activity: Applications for coronavirus spike protein activation

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Analysis of Group IV Viral SSHHPS Using In Vitro and In Silico Methods

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Published on: December 21, 2019

Area of Science:

Virology
Molecular Biology
Immunology

Background:

Highly pathogenic coronaviruses like SARS-CoV-2, MERS-CoV, and SARS-CoV-1 cause significant apoptosis.
Apoptosis is linked to the pathogenesis of these severe respiratory viruses.

Purpose of the Study:

To investigate the role of caspase-6, a key apoptosis protease, in coronavirus replication.
To elucidate the mechanism by which coronaviruses interact with the host apoptosis cascade.

Main Methods:

Enzyme assays to demonstrate caspase-6 cleavage of viral nucleocapsid proteins.
In vivo studies using animal models (hamsters and mice) to assess the effect of caspase-6 inhibition on viral infection and pathology.

Main Results:

Caspase-6 cleaves coronavirus nucleocapsid proteins into fragments that act as interferon antagonists.
Inhibition of caspase-6 significantly reduced lung pathology and weight loss in SARS-CoV-2 infected hamsters.
Caspase-6 inhibition improved survival in MERS-CoV infected mice.

Conclusions:

Caspase-6 is a critical host factor that facilitates efficient coronavirus replication.
Coronaviruses hijack the host apoptosis machinery, specifically caspase-6, to evade immune responses and promote viral spread.