Journal
BIOCHEMISTRY
Volume 48, Issue 31, Pages 7356-7364Publisher
AMER CHEMICAL SOC
DOI: 10.1021/bi9008837
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Funding
- NIGMS NIH HHS [R01 GM088204-01, R01 GM088204] Funding Source: Medline
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The M2 protein of influenza A viruses forms a tetrameric pH-activated proton-selective channel that is targeted by the amantadine class of antiviral drugs. Its ion channel function has been extensively studied by electrophysiology and mutagenesis; however, the molecular mechanism of proton transport is still elusive, and the mechanism of inhibition by amantadine is controversial. We review the functional data on proton channel activity, molecular dynamics simulations of the proton conduction mechanism, and high-resolution structural and dynamical information of this membrane protein in lipid bilayers and lipid-mimetic detergents. These studies indicate that elucidation of the structural basis of M2 channel activity and inhibition requires thorough examination of the complex dynamics and conformational plasticity of the protein in different lipid bilayers and lipid-mimetic environments.
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