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. 2015 Jul 24;54(39):11536–11539. doi: 10.1002/anie.201504549

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© 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

© 2015 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution Non-Commercial NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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UV/Vis absorption spectra of a) WT KR2, b) N112A, c) Q123A, d) Q123V, and e) D116N. The spectra of the mutants (solid blue line) are overlaid with that of the WT (dotted line). Axis labels and scales in (a–e) are the same as given in (e). f) The ion-transport activity of Q123V in E. coli cells in 100 mm NaCl (blue) or KCl (red). The green line shows the pH change in a 100 mm NaCl suspension with 10 μm CCCP. One division (div.) in the vertical axis in (f) represents 0.1 units of pH change.