Correction to: Nature Communications; https://doi.org/10.1038/s41467-018-05631-5; published online 08 August 2018

The previously published version of this Article contained an error in Fig. 3. In Fig. 3a, the residues His667 and Asp669 were incorrectly labelled as His627 and Asp629. The error has been corrected in both the PDF and HTML versions of the Article.