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The nucleotide-induced structural rearrangements in ATP binding cassette (ABC) transporters, leading to substrate translocation, are largely unknown. We have modeled nucleotide binding and release in the vitamin B12 importer BtuCD using perturbed elastic network calculations and biased molecular dynamics simulations. Both models predict that nucleotide release decreases the tilt between the two transmembrane...
Protonated networks of internal water molecules appear to be involved in proton transfer in various integral membrane proteins. High-resolution x-ray studies of protein crystals at low temperature deliver mean positions of most internal waters, but only limited information about fluctuations within such H-bonded networks formed by water and residues. The question arises as to how water molecules behave...
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