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  • Title: Resonance Raman studies of bovine metarhodopsin I and metarhodopsin II.
    Author: Doukas AG, Aton B, Callender RH, Ebrey TG.
    Journal: Biochemistry; 1978 Jun 13; 17(12):2430-5. PubMed ID: 678522.
    Abstract:
    The resonance Raman spectra of bovine metarhodopsin I and metarhodopsin II have been measured. The spectra are compared with model chromophore resonance Raman data. It was found that metarhodopsin I is linked to opsin via a protonated Schiff base linkage, whereas metarhodopsin II is linked by an unprotonated Schiff base. A recent suggestion that the chromophore of metarhodopsin II is retinal is explicitly disproved. The chromophores of both metarhodopsins are found to have an essentially all-trans conformation. The basic mechanism for color regulation in both forms appears to be electron delocalization. The data tend to support the model of cis-trans isomerization as the primary mechanism for vision. Also, the conclusions and inferences of this work on energy uses and storage by rhodopsin in neural generation are discussed.
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