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Insights into the specific feature of the electrostatic recognition binding mechanism between BM2 and BM1: a
Guixuan Xing1, Qingchuan Zheng2,1
1Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China.
Abstract:
Matrix protein 2 (M2) and matrix protein 1 (M1) of the influenza B virus are two important proteins, and the interactions between BM2 and BM1 play an important role in the process of virus assembly and replication. However, the interaction details between BM2 and BM1 are still unclear at the atomic level. Here, we constructed the BM2-BM1 complex system using homology modelling and molecular docking methods. Molecular dynamics (MD) simulations were used to illustrate the binding mechanism between BM2 and BM1. The results identify that the eight polar residues (E88B, E89B, H119BM1, E94B, R101BM1, K102BM1, R105BM1, and E104B) play an important role in stabilizing the binding through the formation of hydrogen bond networks and salt-bridge interactions at the binding interface. Furthermore, based on the simulation results and the experimental facts, the mutation experiments were designed to verify the influence of the mutation of residues both within and outside the effector domain. The mutations directly or indirectly disrupt interactions between polar residues, thus affecting viral assembly and replication. The results could help us understand the details of the interactions between BM2 and BM1 and provide useful information for the anti-influenza drug design.
Insights
Interactions between influenza B virus matrix proteins BM2 and BM1 are crucial for viral replication. This study reveals key polar residues stabilizing their binding, offering insights for antiviral drug design.
Area of Science:
- Virology
- Structural Biology
- Computational Biology
Background:
- Matrix protein 2 (BM2) and matrix protein 1 (BM1) are essential components of the influenza B virus.
- Their interactions are vital for virus assembly and replication, but atomic-level details remain elusive.
Purpose of the Study:
- To elucidate the atomic-level binding mechanism between influenza B virus BM2 and BM1 proteins.
- To identify key residues involved in the BM2-BM1 interaction and their role in viral processes.
- To provide a foundation for designing novel anti-influenza therapeutics.
Main Methods:
- Homology modeling and molecular docking were employed to construct the BM2-BM1 complex.
- Molecular dynamics (MD) simulations were utilized to analyze the binding mechanism.
- Site-directed mutagenesis experiments were performed to validate simulation findings.
Main Results:
- Eight polar residues (E88B, E89B, H119BM1, E94B, R101BM1, K102BM1, R105BM1, E104B) were identified as critical for stabilizing the BM2-BM1 interaction via hydrogen bonds and salt bridges.
- Mutations affecting these polar residues disrupted the BM2-BM1 complex, impacting viral assembly and replication.
- Both effector domain and non-effector domain mutations demonstrated significant effects.
Conclusions:
- The study provides a detailed atomic-level understanding of the BM2-BM1 interaction in influenza B virus.
- Key polar residues and their interactions are crucial for maintaining viral integrity and function.
- These findings offer valuable targets for the development of new anti-influenza drugs.
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