Correction to: Nature Structural & Molecular Biology https://doi.org/10.1038/s41594-022-00727-5, published online 24 February 2022.

In the version of this article initially published, in the penultimate sentence of the Methods “BRET-based assays” section, there was a typographical error in the sentence now reading, in part, “Ten minutes after the addition of ligand, plates were read using a SpectraMax iD5 plate reader using 410 and 515 nm emission filters,” where 410 and 515 replace the original “585 and 525 nm” listed. Further, in the original version, the captions for Fig. 2a,b were interchanged. The errors have been corrected in the HTML and PDF versions of the article.