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. Author manuscript; available in PMC: 2010 Oct 28.
Published in final edited form as: J Am Chem Soc. 2009 Oct 28;131(42):15160–15169. doi: 10.1021/ja9034768

Figure 1.

Figure 1

Molecular structures of the 11-cis retinal PSB chromophore in rhodopsin (A) and the all-trans retinal unprotonated SB chromophore in Meta II (B). 15N CP MAS spectra of rhodopsin (C) and Meta II (D) labeled with 15Nε-lysine. The 15Nε-Lys296 is observed as a distinct narrow peak at 155.4 ppm in rhodopsin and shifts ~127 ppm downfield to 282.8 ppm in Meta II. The 15Nε resonances of the free lysines in rhodopsin are observed as a broad peak around 8.7 ppm.