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- W2009804533 abstract "The emission spectrum of intact purple membranes of Halobacterium halobium has a very short wavelength position (the main maximum at 314 nm) and can be fitted by two spectral components, one of which (component A) corresponds to the fluorescence of buried tryptophan residues located in a highly hydrophobic rigid environment (like the single tryptophan residue in azurin), the other (component I) being due to the emission of buried tryptophan residues located in a rather polar environment. Treatment of bacteriorhodopsin by NaBH4, fragmentation of the membranes and thermal formation of vesicles result in a decrease in the contribution of component A, an increase in that of component I and the appearance of spectral components corresponding to the emission of surface tryptophan residues. Temperature induces at least two distinct changes of the fluorescence parameters of the protein: one change occurs from 45 to 65°C. the other from 65 to 90°C. The spectral changes correlate with the peaks of heat sorption caused by thermal transitions in the purple membrane structure and conformational changes in the protein structure. Alkaline denaturation of bacteriorhodopsin registered by tryptophan fluorescence begins at pH > 11.0." @default.
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- W2009804533 title "A spectrofluorometric study of the environment of tryptophans in bacteriorhodopsin" @default.
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- W2009804533 doi "https://doi.org/10.1016/0301-4622(83)85009-1" @default.
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