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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The photoconversion of lumirhodopsin at 77 degrees K. Estimation of the quantum efficiency.

Evidence is presented that lumirhodopsin (containing all-trans retinal) is not directly photoconverted to bathorhodopsin (all-trans) at 77 degrees K as previously suggested (Yoshizawa and Wald. 1963. Nature (Lond.) 197:1279-1286). Rather, lumirhodopsin is converted to a new species, L' (11-cis and/or 9-cis retinal) which, on warming to room temperature, is indistinguishable from rhodopsin or isorhodopsin. The quantum efficiency for the conversion of lumirhodopsin to L' is estimated to be 0.5 +/- 0. 1. This value is significantly higher than that of other all-trans to cis conversions for bovine rhodopsin intermediates, indicating that the opsin conformation has a significant effect on a pigment's quantum efficiency.[1]


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