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How does influenza virus a escape from amantadine?

Guangrong Qin1, Kunqian Yu, Ting Shi

  • 1Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China.

The Journal of Physical Chemistry. B
|June 5, 2010
PubMed

Insights

Amantadine (AMT) resistance in influenza A is linked to M2 protein mutations. This study reveals AMT binding within the M2 channel pore disrupts water flow, inhibiting viral function and clarifying drug resistance mechanisms.

Area of Science:

  • Virology
  • Structural Biology
  • Computational Chemistry

Background:

  • Antiviral drugs like amantadine (AMT) have shown reduced efficacy against influenza A virus.
  • The M2 protein's transmembrane domain, particularly the S31N mutation, is implicated in AMT resistance.

Purpose of the Study:

  • To elucidate the structural and mechanistic basis of amantadine resistance in influenza A virus M2 protein.
  • To investigate the role of M2 protein structure and amantadine binding in channel function.

Main Methods:

  • Utilized molecular dynamics (MD) simulations to model wild-type and S31N mutant M2 proteins.
  • Employed quantum mechanics/molecular mechanics (QM/MM) calculations to analyze amantadine binding modes and interactions.
  • Investigated the formation and modulation of water wires within the M2 channel.

Main Results:

  • MD simulations showed amantadine binding at various positions within the M2 channel pore.
  • QM/MM calculations confirmed these binding modes and their impact on channel function.
  • Disruption of a critical water wire by amantadine binding was identified as essential for M2 channel inhibition.
  • The S31N mutation prevents effective channel blocking, leading to amantadine resistance.

Conclusions:

  • Amantadine binds within the pore of the M2 channel, supporting specific binding site hypotheses.
  • The mechanism of amantadine resistance involves the failure to block the essential water wire in the S31N mutant.
  • Findings provide insights into influenza A virus drug resistance and can aid in developing new antiviral therapies.

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