Spying on SARS-CoV-2 with Fluorescent Tags and Protease Reporters

Area of Science:

• Virology
• Microscopy
• Biotechnology

Background:

• The COVID-19 pandemic highlights the significant impact of viruses, such as SARS-CoV-2, on global health.
• Understanding viral life cycles and host cell interactions is crucial for developing antiviral strategies.
• Fluorescence microscopy is essential for virus imaging due to its high resolution, sensitivity, and spectroscopic capabilities.

Purpose of the Study:

• To review recent advancements in virus imaging techniques.
• To discuss the application of novel reporters for monitoring viral processes and protease activity.
• To highlight the potential of these tools in antiviral drug discovery and diagnostics.

Main Methods:

• In situ imaging of viral RNA translation and assembly using SunTag and StayGold techniques.
• Development and application of genetically encoded fluorogenic protease reporters (e.g., FlipGFP) for monitoring SARS-CoV-2 proteases (Mpro and PLpro).
• Utilizing these assays for high-throughput screening to identify potential antiviral compounds.

Main Results:

• SunTag and StayGold enable detailed visualization of viral RNA translation and assembly.
• Fluorogenic protease reporters effectively monitor the activity of SARS-CoV-2 Mpro and PLpro.
• These reporter assays have successfully identified potential antiviral agents through screening.

Conclusions:

• Advanced imaging techniques and fluorogenic reporters provide powerful platforms for virological research.
• These tools are instrumental in understanding viral mechanisms and accelerating the discovery of antivirals.
• Fluorogenic viral protease reporters show significant promise for future viral disease diagnostics and therapeutics.