Modeling the resonance Raman spectrum of a metarhodopsin: implications for the color of visual pigments.

AUTOR(ES)

Sulkes, M

RESUMO

Resonance Raman spectra of an invertebrate rhodopsin are reported. The spectrum of squid acid metarhodopsin is compared with the spectra of model compounds of the retinylidene chromophore in the all-trans conformation. Correlations made between acid metarhodopsin and these crystalline model compounds with known x-ray structures indicate that the chromophore in this intermediate is an all-trans protonated Schiff base. The data suggest a mechanism for the red shift in rhodopsin.

Documentos Relacionados

• Why are blue visual pigments blue? A resonance Raman microprobe study.
• Primary structures of chicken cone visual pigments: vertebrate rhodopsins have evolved out of cone visual pigments.
• Charge stabilization mechanism in the visual and purple membrane pigments.
• The pKa of the protonated Schiff bases of gecko cone and octopus visual pigments.
• Heme synthesis in the rhizobium-legume symbiosis: a palette for bacterial and eukaryotic pigments.