Correction to: Nature Structural & Molecular Biology https://www.nature.com/articles/s41594-019-0227-9, published online 20 May 2019.

In the version of this article initially published, the genus and species were named incorrectly (H. sapiens) in the third sentence of the fifth paragraph of the third subsection of Results (‘Pan2 contacts the ribophosphate backbone of poly(A) RNA’) and in the first sentence of the legend to Supplementary Fig. 3. The correct genus and species are S. pombe. Also, the designation CAF1 is incorrect in the fourth sentence of the second paragraph and throughout the fifth paragraph of that subsection of Results, as well as in Supplementary Figs. 3 and 4 and their titles and legends. The correct designation in those places is Caf1.The errors have been corrected in the HTML and PDF versions of the article.