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Modeling the membrane environment has implications for membrane protein structure and function: influenza A M2

Huan-Xiang Zhou1, Timothy A Cross

  • 1Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.

Protein Science : a Publication of the Protein Society
|February 8, 2013
PubMed

Insights

Structural studies of the Influenza A M2 proton channel reveal significant backbone variations influenced by membrane environments. These findings offer insights into drug binding and the channel's proton transport mechanism.

Area of Science:

  • Structural Biology
  • Biophysics
  • Virology

Background:

  • The M2 protein of Influenza A is a critical proton channel and a key drug target.
  • Understanding its structure is essential for developing antiviral therapies.
  • Previous structural studies have provided insights but lacked detail on environmental influences.

Purpose of the Study:

  • To structurally characterize the Influenza A M2 protein in various membrane mimetic environments.
  • To elucidate the functional mechanism of proton selectivity, conductance, and gating.
  • To investigate how membrane environments affect M2 protein structure and drug binding.

Main Methods:

  • X-ray diffraction and Nuclear Magnetic Resonance (NMR) spectroscopy (solution and solid-state).
  • Studies conducted in diverse membrane mimetic environments.
  • Computational integration for functional mechanism analysis.

Main Results:

  • Observed substantial backbone differences in M2 protein structures across environments.
  • Identified a conserved left-handed tetrameric helical bundle in the transmembrane domain.
  • Demonstrated unique histidine tetrad chemistry in lipid bilayers, enhancing tetramer stability and influencing proton binding.

Conclusions:

  • Membrane mimetic environments significantly influence M2 protein structure, particularly helix tilt and histidine tetrad chemistry.
  • The observed structural variations impact drug binding sites and the proton transport mechanism.
  • Detailed understanding of M2 protein's functional mechanism provides a basis for rational drug design against Influenza A.

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