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Channel gating and proton conductance of the influenza A virus M2 channel result from complex pH-dependent interactions involving the pore-lining residues His37, Trp41, and Asp44. Protons diffusing from the outside of the virus protonate His37, which opens the Trp41 gate and allows one or more protons to move into the virus interior. The Trp41 gate gives rise to a strong asymmetry in the conductance,...
We report the solution NMR structure of a designed dimetal-binding protein, di-Zn(II) DFsc, along with a secondary refinement step employing molecular dynamics techniques. Calculation of the initial NMR structural ensemble by standard methods led to distortions in the metal-ligand geometries at the active site. Unrestrained molecular dynamics using a nonbonded force field for the metal shell, followed...
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