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Comprehensive analysis of SARS-CoV-2 Spike evolution: epitope classification and immune escape prediction
Natália Fagundes Borges Teruel1, Matthew Crown2, Ricardo Rajsbaum3
1Department of Pharmacology and Physiology, Faculty of Medicine, Université de Montréal, Montreal, Canada.
Virus Evolution
|June 13, 2025
Summary
Analyzing 1560 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) Spike protein structures reveals two evolutionary trade-offs driving immune escape in COVID-19 variants. Mutations impact ACE2 binding and conformational dynamics for immune evasion.
Area of Science:
- Virology
- Structural Biology
- Evolutionary Biology
Background:
- The COVID-19 pandemic, caused by SARS-CoV-2, has led to extensive structural studies of its Spike protein.
- Understanding Spike protein evolution is crucial for predicting and combating new variants.
Purpose of the Study:
- To comprehensively analyze SARS-CoV-2 Spike protein structures and identify distinct epitopes.
- To investigate the evolutionary trade-offs driving viral immune escape.
Main Methods:
- Analysis of 1560 published SARS-CoV-2 Spike protein structures using interaction-energy-informed geometric clustering.
- Integration of longitudinal genomic data from nearly 3 million viral sequences.
- Per-residue interaction evaluations and deep mutational scanning data correlation.
Main Results:
- Identification of 14 structurally distinct epitopes based on conformational specificity, ACE2 interface, and glycosylation.
- Prediction of antibody recognition sites and immune escape correlated with deep mutational scanning.
- Discovery of an enthalpic trade-off (mutations weakening ACE2 binding) and an entropic trade-off (mutations altering conformational equilibrium).
Conclusions:
- SARS-CoV-2 Spike protein evolution is shaped by distinct enthalpic and entropic trade-offs influencing immune escape.
- Mutations outside the receptor-binding motif can evade immune detection by modulating Spike's conformational dynamics.
- This study provides insights into the complex evolutionary mechanisms of SARS-CoV-2 variants.
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