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Chromophore conformations and electron densities in Slr1393g3. (A) Pr state, (B) hybrid state (back isomerized chromophore) showing a highly distorted Z,Z,Z,s,s,a configuration, and (C) Pg photoproduct showing the chromophore in Z,Z,E,s,s,a configuration. Note the changed relative orientation of the PCB molecule in B and C with respect to helix α4 and β-sheets β5, β6. Electron densities are shown for the chromophore and the covalently bound Cys528, contoured at 1σ.
