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Biophysical Journal 55: 725-729 (1989)
© 1989 the Biophysical Society

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Wavelength regulation in iodopsin, a cone pigment.

J G Chen, T Nakamura, T G Ebrey, H Ok, K Konno, F Derguini, K Nakanishi and B Honig

University of Illinois, Department of Physiology and Biophysics, Urbana 61801.

ABSTRACT

The opsin shift, the difference in wavenumber between the absorption peak of a visual pigment and the protonated Schiff base of the chromophore, represents the influence of the opsin binding site on the chromophore. The opsin shift for the chicken cone pigment iodopsin is much larger than that for rhodopsin. To understand the origin of this opsin shift and the mechanism of wavelength regulation in iodopsin, a series of synthetic 9-cis and 11-cis dehydro- and dihydro-retinals was used to regenerate iodopsin-based pigments. The opsin shifts of these pigments are quite similar to those found in bacteriorhodopsin-based artificial pigments. On the basis of these studies, a tentative model of wavelength regulation in iodopsin is proposed.






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Copyright © 1989 by the Biophysical Society.