Rhodopsin and 9-demethyl-retinal analog: effect of a partial agonist on displacement of transmembrane helix 6 in class A G protein-coupled receptors. VOLUME 283 (2008) PAGES 4967-4974

On Page 4967 in the Abstract, lines 12-15 should read as follows: “Earlier site-directed spin labeling studies of rhodopsin identified a rigid-body tilt of the cytoplasmic segment of transmembrane helix 6 (TM6) by ∼6 Å as a central event in rhodopsin activation.” Lines 18-20 should read as follows: “This fraction can be increased by increasing proton concentration or by anticipation of the activating protonation step by the mutation E134Q in 9-dm-rhodopsin.”