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A detailed conformational analysis of the known crystal structures of vitamin A, carotenoid, and xanthenoid derivatives has been made. These studies suggest that the visual chromophore 11-cis retinal and its isomers may each occur in several different conformational states, which would be expected to have different lightabsorbing characteristics. The presence of such states for 11-cis retinal and all-trans retinal may contribute to the observed rhodopsin intermediates that have been characterized by different lambda(max) values, and to the breadth of spectral response in scotopic and color vision.

Structures of the Visual Chromophores and Related Pigments: A Conformational Basis of Visual Excitation