Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-019-0370-3, published online 3 February 2020.

In the version of this article initially published online, in Fig. 6d, the third and fourth bars were incorrectly labeled “DMSO + cytochrome D” and “MLN4924 + cytochrome D,” respectively. They should have been labeled “DMSO + cytochalasin D” and “MLN4924 + cytochalasin D,” respectively. The errors have been corrected in the print, PDF and HTML versions of the article.