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A physical model for M1-mediated influenza A virus assembly
Julia Peukes1, Serge Dmitrieff2, François J Nédélec3
1Structural Studies Division, Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom; California Institute for Quantitative Biology (QB3), University of California, Berkeley, Berkeley, California.
Biophysical Journal
|November 22, 2024
Summary
Influenza A virus assembly is explained by a new model of matrix protein 1 (M1) polymerization. This helical M1 structure optimizes efficient virus production and growth.
Area of Science:
- Virology
- Biophysics
- Structural Biology
Background:
- Influenza A virus assembly occurs at the host cell plasma membrane.
- Viral components coordinate to form new, enveloped virus particles.
- The matrix protein 1 (M1) plays a crucial role in virus assembly.
Purpose of the Study:
- To integrate molecular insights of influenza virus assembly into a theoretical mechanical framework.
- To model the polymerization of M1 and membrane protrusion formation.
- To understand the physical factors controlling M1 helix architecture and its evolutionary advantage.
Main Methods:
- Theoretical modeling of virus assembly mechanics.
- Integration of recent molecular insights on M1 structure.
- Analysis of M1 polymerization and membrane deformation.
- Consideration of viral filament growth force and speed.
Main Results:
- A model describing M1 polymerization and membrane protrusion formation was developed.
- The efficiency of M1 forming long strands assembling into helices in filamentous virions is explained.
- Physical properties of viral proteins and host cell membrane control M1 helix architecture.
- The helical geometry of M1 strands is proposed to optimize virus assembly and growth.
Conclusions:
- The study provides a theoretical framework for understanding influenza A virus assembly mechanics.
- M1 helix architecture is determined by physical interactions between viral and host factors.
- Helical M1 structures likely evolved to enhance the speed and efficiency of virus production.
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