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Computational studies of proton transport through the M2 channel
Author(s) -
Wu Yujie,
Voth Gregory A
Publication year - 2003
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(03)00779-8
Subject(s) - conductance , helix (gastropod) , chemistry , proton , ion channel , side chain , solid state nuclear magnetic resonance , selectivity , crystallography , nuclear magnetic resonance , physics , polymer , biology , ecology , biochemistry , receptor , organic chemistry , quantum mechanics , snail , catalysis , condensed matter physics
The M2 ion channel is an essential component of the influenza A virus. This low‐pH gated channel has a high selectivity for protons. Evidence from various experimental data has indicated that the essential structure responsible for the channel is a parallel homo‐tetrameric α‐helix bundle having a left‐handed twist with each helix tilted with respect to the membrane normal. A backbone structure has been determined by solid state nuclear magnetic resonance (NMR). Though detailed structures for the side chains are not available yet, evidence has indicated that His37 and Trp41 in the α‐helix are implicated in the local molecular structure responsible for the selectivity and channel gate. More definitive conformations for the two residues were recently suggested based on the known backbone structure and recently obtained NMR data. While two competitive proton‐conductance mechanisms have been proposed, the actual proton‐conductance mechanism remains an unsolved problem. Computer simulations of an excess proton in the channel and computational studies of the His37/Trp41 conformations have provided insights into these structural and mechanism issues.