BIOPHYSICS AND COMPUTATIONAL BIOLOGY, CHEMISTRY
Correction for “Protons migrate along interfacial water without significant contributions from jumps between ionizable groups on the membrane surface,” by Andreas Springer, Volker Hagen, Dmitry A. Cherepanov, Yuri N. Antonenko, and Peter Pohl, which appeared in issue 35, August 30, 2011, of Proc Natl Acad Sci USA (108:14461–14466; first published August 22, 2011; 10.1073/pnas.1107476108).
The authors note that Fig. 2 appeared incorrectly. The corrected figure and its legend appear below. This error does not affect the conclusions of the article.
Fig. 2.
Kinetics of fluorescence changes on top of three different lipid bilayers due to lateral proton migration. The observation area was located at a distance of 70 μm from the area of proton release. Because all FPE molecules are surrounded by DPhPC or DPhPE molecules, they are anticipated to accept protons, which are released from these molecules. GMO does not possess ionizable moieties so that in case of two-dimensional diffusion, proton release from one FPE molecule seems to be required before the next FPE molecule may pick up the proton. Despite the huge differences in proton release rates from the different lipids, τmax for all three lipid bilayers was similar. That is, lateral proton diffusivity is independent of the choice of the lipid. The buffer contained 0.1 mM Capso (pH 9.0) and 100 mM NaCl.