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Processing of the SARS-CoV pp1a/ab nsp7-10 region
Boris Krichel1, Sven Falke2, Rolf Hilgenfeld3,4
1Heinrich Pette Institute, Leibniz Institute for Experimental Virology, Martinistraße 52, 20251 Hamburg, Germany.
The Biochemical Journal
|February 22, 2020
Summary
Native mass spectrometry reveals the dynamic processing of coronavirus polyproteins. This study identified a specific cleavage order and a predominant nsp7+8 hetero-tetramer, offering insights for antiviral development.
Area of Science:
- Virology
- Biochemistry
- Structural Biology
Background:
- Severe acute respiratory syndrome coronavirus (SARS-CoV) causes severe respiratory illness.
- Viral replication relies on the processing of polyproteins by proteases.
- Understanding these processes is crucial for developing antiviral therapies.
Purpose of the Study:
- To analyze the processing dynamics of the SARS-CoV nsp7-10 polyprotein region.
- To investigate the protein interactions and complex formation during polyprotein processing.
- To explore the utility of native mass spectrometry in studying viral polyprotein dynamics.
Main Methods:
- Native mass spectrometry was employed to analyze the nsp7-10 polyprotein processing.
- Monitoring of substrate consumption, intermediate product formation, and complexation was performed.
- Analysis focused on cleavage efficiencies and resulting protein complexes.
Main Results:
- Demonstrated sequential cleavage efficiencies influenced by polyprotein tertiary structure.
- Identified a predominant nsp7+8(2:2) hetero-tetramer with nsp8 acting as a scaffold.
- Observed substrate consumption and the rise and fall of intermediate products.
Conclusions:
- Native mass spectrometry provides a comprehensive view of viral polyprotein processing dynamics and interactions.
- The findings offer new insights into the formation of viral replication complexes.
- This research has implications for the development of novel antiviral strategies targeting viral proteases.
