Nat. Struct. Mol. Biol. 14, 841–846 (2007); published online 26 August 2007; corrected after print 17 September 2007

In the version of this article initially published, the proposed model for coupling the rotation and catalysis of the F1 β subunits to the concerted activity of their active sites shown in Figure 4 was incorrectly drawn. A corrected version is depicted here. The error has been corrected in the HTML and PDF versions of the article.