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A Fluorogenic Peptide Cleavage Assay to Screen for Proteolytic Activity: Applications for coronavirus spike protein activation
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A novel method for synthesizing authentic SARS-CoV-2 main protease.

Cheng Zhao1, Yi Rong1, Shuyuan Shi1

  • 1College of Biomedical Engineering, Taiyuan University of Technology, Taiyuan, 030024, People's Republic of China.

Protein Expression and Purification
|June 9, 2024
PubMed
Summary

A new method simplifies producing authentic SARS-CoV-2 main protease (Mpro) via single digestion. This efficient process yields highly active Mpro, crucial for developing new antiviral drugs against coronavirus infections.

Keywords:
AuthenticEnzyme activityMain proteaseSARS-CoV-2Specificity

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Area of Science:

  • Biochemistry
  • Virology
  • Drug Discovery

Background:

  • The SARS-CoV-2 main protease (Mpro) is essential for viral replication and a key target for antiviral therapies.
  • Current methods for obtaining authentic Mpro involve complex, multi-step proteolytic cleavage processes.

Purpose of the Study:

  • To develop a streamlined, single-digestion method for producing active SARS-CoV-2 Mpro.
  • To investigate the substrate specificity of Mpro to inform antiviral drug design.

Main Methods:

  • Engineered a recombinant protein with an N-terminal His tag containing TEV protease cleavage sites.
  • Utilized TEV protease for single-step digestion to release authentic Mpro.
  • Assessed protein activity and molecular weight post-digestion.
  • Analyzed Mpro substrate specificity, focusing on the P2 position.

Main Results:

  • Successfully produced authentic SARS-CoV-2 Mpro using a single TEV protease digestion step.
  • The resulting Mpro exhibited significantly increased activity and a reduced molecular weight compared to uncleaved protein.
  • Identified a strong preference for Phenylalanine (Phe) at the P2 substrate position, indicating the S2 subsite as a promising target for inhibitor development.

Conclusions:

  • The novel single-digestion method provides an efficient means to obtain active SARS-CoV-2 Mpro.
  • Understanding Mpro substrate specificity, particularly the S2 subsite, is vital for designing effective antiviral agents.
  • This preparation method serves as a valuable reference for future research on coronavirus infections.