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Transmembrane Domain Length of Influenza a Virus M2 Does Not Determine Its Non-Lipid Raft Localization.

Rashid Manzoor1, Kosuke Okuya2, Reiko Yoshida3

  • 1Faculty of Health Sciences, Higher Colleges of Technology, Sharjah P.O. Box 7946, United Arab Emirates.

Viruses
|January 28, 2026
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Summary

Altering the transmembrane domain (TMD) length of influenza A virus matrix protein 2 (M2) did not change its lipid raft association. However, increased M2-TMD length impaired virus replication.

Keywords:
M2 proteininfluenza viruslipid rafttransmembrane domain

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Influenza A virus envelope proteins hemagglutinin (HA), neuraminidase (NA), and matrix protein 2 (M2) have distinct localizations.
  • HA and NA associate with lipid rafts due to longer transmembrane domains (TMDs) compared to M2.
  • M2 localizes in peri-raft regions despite some lipid raft-targeting features.

Purpose of the Study:

  • To investigate the role of M2 TMD length in lipid raft association and its impact on influenza A virus replication.
  • To determine if increasing M2 TMD length alters its localization within cellular membranes.
  • To assess the functional consequences of modified M2 TMD length on virus replication.

Main Methods:

  • Introduction of amino acid insertions into the M2 N-terminal region to create mutants with increased TMD lengths (22, 25, and 27 residues).
  • Confocal microscopy, immunoprecipitation, and cell cytotoxicity assays to evaluate M2-TMD mutant expression and function.
  • Triton X-100 solubility assays and colocalization analysis to determine M2-TMD mutant localization relative to lipid rafts.

Main Results:

  • M2-TMD mutants exhibited cell surface expression and cytotoxic potential comparable to wildtype M2.
  • Despite increased TMD length, M2-TMD mutants predominantly localized in non-raft domains, similar to wildtype M2.
  • Increased M2-TMD length negatively impacted influenza A virus replication.

Conclusions:

  • M2-TMD length is not the primary determinant of its association with lipid raft domains.
  • The TMD length of M2 is optimized for its proper function within the virus replication cycle.
  • Findings suggest a complex interplay of factors, beyond TMD length, governs M2 localization and function.