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Retraction of "Orientation-Dependent Electron Transport in a Single Redox Protein".

This article, which was the subject of a Perspective article, contains an error in Figure 4. In the caption to Figure 4, it is stated that the I(z) (conductance vs distance) traces displayed in Figure 4a−d were measured on specific molecules of the protein cyt b562, labeled with arrows in the corresponding inset images. We have since discovered that the inset images of Figure 4a−d were recorded on different experimental equipment at an earlier time to the I(z) traces and do not correspond to the specific protein molecules described in the Figure 4 caption. Furthermore, we cannot confirm unambiguously that the I(z) data presented were obtained from the specific protein variants stated. Three of the authors (M.E., D.D.J., and J.E.M.) wish, therefore, to retract the article, particularly based on the findings reported regarding the I(z) data and analysis. E.A.D.P. accepts the error in the imaging figures of Figure 4, but stands by the associated I(z) data. Further experiments using the published methods are being undertaken. Measurements to date show that similar I(z) curves can be acquired above single molecules, but histograms with features of the form published have not been observed. In conclusion, our original claims regarding the values of conductance observed over individual molecules of the three types studied is not sufficiently supported by the available experimental data. This retraction request was initiated as part of an investigation by M.E., D.D.J., and J.E.M., together with the School of Physics and Astronomy at Cardiff University.