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Pubmed ID :28107633
Publication Date : //

Binding and Proton Blockage by Amantadine Variants of the Influenza M2 and M2 Explained.


While aminoadamantanes are well-established inhibitors of the influenza A M2 proton channel, the mechanisms by which they are rendered ineffective against M2 are unclear. Solid state NMR, isothermal titration calorimetry, electrophysiology, antiviral assays, and molecular dynamics simulations suggest stronger binding interactions for aminoadamantanes to M2 compared to negligible or weak binding to M2. This is due to reshaping of the M2 pore when N31 is present, which, in contrast to wild-type (WT), leads (A) to the loss of the V27 pocket for the adamantyl cage and to a predominant orientation of the ligand's ammonium group toward the N-terminus and (B) to the lack of a helical kink upon ligand binding. The kink, which reduces the tilt of the C-terminal helical domain relative to the bilayer normal, includes the W41 primary gate for proton conductance and may prevent the gate from opening, representing an alternative view for how these drugs prevent proton conductance.

Authors : Tzitzoglaki Christina , Wright Anna , Freudenberger Kathrin , Hoffmann Anja , Tietjen Ian , Stylianakis Ioannis , Kolarov Felix , Fedida David , Schmidtke Michaela , Gauglitz Günter , Cross Timothy A , Kolocouris Antonios ,

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