Nature Communications 5: Article number: 3207 doi: 10.1038/ncomms4207 (2014); Published: 4 February 2014; Updated 11 November 2014.

This Article contains errors in Fig. 3c that were introduced during the production process. In the lower half of the panel, the labels ‘Outer EF’, ‘Inner membrane PF’ and ‘Outer membrane EF’ should have been ‘Outer PF’, ‘Inner membrane EF’ and ‘Outer membrane PF’, respectively. The correct version of this figure follows.