Biochemistry. 2009 Oct 27;48(42):9949-51.

Simulations of the BM2 proton channel transmembrane domain from influenza virus B.

Rouse SL, Carpenter T, Stansfeld PJ, Sansom MS.

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Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.

Abstract

BM2 is a small integral membrane protein from influenza B virus which forms proton-permeable channels. Coarse-grained (CG) molecular dynamics simulations have been used to produce a model of the BM2 channel by self-assembly of a tetrameric bundle of BM2 transmembrane helices in a lipid bilayer. The BM2 channel model is conformationally stable on a 5 mus time scale. This CG model was converted to atomistic resolution to refine interhelix and channel-water interactions. Atomistic molecular dynamics simulations indicate that the BM2 channel is closed when no more than two of the four His19 residues are protonated. Protonating a third His19 side chain initiates a conformational change that opens the channel. In summary, our simulations suggest a common mechanism for BM2 and A/M2, whereby changes in helix packing play a functional role in channel gating.

PMID:: 19780586; [PubMed - indexed for MEDLINE]

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