By Hitoshi Shichi (Auth.)
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Additional info for Biochemistry of Vision
02 m M . T h e antioxidant scavenges the reactive o x y g e n species and radicals. During the conversation of a-tocopherol to α-tocopherol quinone two electrons are released. α-Tocopherol principally inactivates the singlet o x y g e n . Exposure of frog rod outer segments to light results in the accumulation of lipid hydroperoxide in the membrane and the wavelength dependence of hydroperoxide production is similar to the absorption spectrum of rhodopsin (49). α-Tocopherol inhibits the light-induced accumulation of lipid peroxide.
DOCOSAHEXAENOIC ACID 6 Fig. 8. Chemical structure of all-c/s-docosahexaenoic acid ( C 2 2, Δ ) . 1 Others a From F. J. M. Daemen. Vertebrate rod outer segment membranes. Biochim. Biophys. Acta 300, 2 5 5 - 2 8 8 (1973); and R. E. Anderson and L. D. Andrews. Biochemistry of retinal photoreceptor membranes in vertebrates and invertebrates. In "Visual Cells in Evolution" 0- A . ), pp. 1-22. Raven Press, New York, 1982. PC, phosphatidylcholine; PE, phospatidylethanolamine; PS, phosphatidylserine. The number of carbon atoms and the number of double bonds define the type of fatty acid.
In other words, the distance c a n be estimated from the efficiency of energy transfer. Other types of probes may Rl + HS-Protein = R-S-Protein + Absorption Λ. m HI ax = 350nm Fluorescence \ max = 495nm N H - C H 2C H 2- N H - C - C H 2 - I Rl: SO3- Fig. 4. An example of fluorescence probe that reacts with sulfhydryl groups of rhodopsin. 41 II. Disposition of Rhodopsin in the Membrane be attached to the sugar moiety and a second site of the pigment. In this case, a distance between the sugar moiety and the second probe c a n be determined as long as energy transfer occurs between the donor and a c c e p tor probes.
Biochemistry of Vision by Hitoshi Shichi (Auth.)