Comparative studies on the late bleaching processes of four kinds of cone visual pigments and rod visual pigment

Biochemistry
Keita SatoY Shichida

Abstract

Visual pigments in rod and cone photoreceptor cells of vertebrate retinas are highly diversified photoreceptive proteins that consist of a protein moiety opsin and a light-absorbing chromophore 11-cis-retinal. There are four types of cone visual pigments and a single type of rod visual pigment. The reaction process of the rod visual pigment, rhodopsin, has been extensively investigated, whereas there have been few studies of cone visual pigments. Here we comprehensively investigated the reaction processes of cone visual pigments on a time scale of milliseconds to minutes, using flash photolysis equipment optimized for cone visual pigment photochemistry. We used chicken violet (L-group), chicken blue (M1-group), chicken green (M2-group), and monkey green (L-group) visual pigments as representatives of the respective groups of the phylogenetic tree of cone pigments. The S, M1, and M2 pigments showed the formation of a pH-dependent mixture of meta intermediates, similar to that formed from rhodopsin. Although monkey green (L-group) also formed a mixture of meta intermediates, pH dependency of meta intermediates was not observed. However, meta intermediates of monkey green became pH dependent when the chloride ion bound to the monk...Continue Reading

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Citations

Jun 6, 2012·Journal of the American Chemical Society·Sivakumar SekharanKeiji Morokuma
Oct 12, 2013·Biochemical and Biophysical Research Communications·Kei TsutsuiSatoru Kawamura
Sep 12, 2013·Biochimica Et Biophysica Acta·Yasushi Imamoto, Yoshinori Shichida
Jan 1, 2014·The Journal of Biological Chemistry·Keiichi KojimaYoshinori Shichida
May 24, 2017·Proceedings of the National Academy of Sciences of the United States of America·Keiichi KojimaYoshinori Shichida
Apr 11, 2013·Biochemistry·Yasushi ImamotoYoshinori Shichida

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