Nature Communications 8: Article number: 7093 (2015); Published: 12 May 2015; Updated: 29 September 2017

An error was inadvertently introduced into the fifth sentence of the Abstract in the original version of this Article. The sentence should have stated ‘Force spectra determined that the S4 transmembrane domain is mechanically coupled to S5 in the open state, but S3 in the closed state’ and not ‘Force spectra determined that the S4 transmembrane domain is mechanically coupled to S5 in the closed state, but S3 in the open state’. This has now been corrected in both the PDF and HTML versions of the Article.