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  • Title: A vibrational analysis of rhodopsin and bacteriorhodopsin chromophore analogues: resonance Raman and infrared spectroscopy of chemically modified retinals and Schiff bases.
    Author: Cookingham RE, Lewis A, Lemley AT.
    Journal: Biochemistry; 1978 Oct 31; 17(22):4699-711. PubMed ID: 728379.
    Abstract:
    Resonance Raman spectroscopy has been used to study chemically modified retinal analogues involving chain substitutions, ring substitutions, or Schiff-base linkages. In addition, retinal fragments and fully deuterated retinals were investigated, and infrared spectra of the four isomers of retinal were obtained. Low-frequency resonance Raman spectra are also reported for all of the isomers of retinal, for the protonated and unprotonated Schiff bases of trans-retinal, for beta-ionone, and for trans-3-dehydroretinal. Band assignments were made to specific vibrational motions, and these assignments have led to a detailed understanding of the spectral features observed in the resonance raman spectra of the retinylidene chromophore in rhodopsin and bacteriorhodopsin.
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