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Bacteriorhodopsin (bR) in the native purple membrane, in wild type expressed in E. coli and reconstituted in lipid vesicles, and its constituted mutants with substitutions of Tyr-185 by Phe all are found to have different visible retinal CD spectra. The results strongly suggest that the environment of the retinal in bR determines the sign and heterogeneity of its visible retinal CD spectrum. This...
The application of a successive annealing procedure to the scanning calorimetric endotherm of the purple membrane from Halobacterium halobium in phosphate buffer, pH 7.5, leads to five thermal transitions beneath the overall endotherm. Circular dichroism and fluorescence experiments have also been carried out with the native membrane heated at the same scan rate as in calorimetric runs (1 o ...
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