Nature Cell Biology 19, 1358–1370 (2017); published online 23 October 2017; corrected after print 13 November 2017.

In the version of this Article originally published, an amino acid (aa) range in Fig. 2a incorrectly read 390–53 aa. The correct range is 390–531 aa. In addition, two labels from Fig. 8j were displaced during production and instead appeared over Fig. 8g. These errors have now been corrected in the online version of the Article.