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. Author manuscript; available in PMC: 2009 Jun 11.
Published in final edited form as: J Magn Reson. 2007 Sep 20;189(2):251–279. doi: 10.1016/j.jmr.2007.09.013

Figure 1.

Figure 1

Nomenclature of 13C sites of the retinal chromophore and the Lys 216 side chain to which it is covalently attached. The arrow indicates that during the bR photocycle there is isomerization about the C13–C14 bond. In light-adapted bR the retinal is in an all-trans conformation and the Schiff base nitrogen is protonated, whereas in dark adapted bR, three retinal conformations are present as shown by the DNP enhanced spectra in Figure 2 (vide infra).