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• W2077504744 abstract "Abstract The biliprotein, phycocyanin 612, was purified from the cryptomonad, Hemiselmis virescens , and its chromophore content confirmed by an analysis of its tryptic peptides. Chromatography of a tryptic digest indicated that the isolated protein has three different phycocyanobilin chromopeptides and a single cryptoviolin chromopeptide. Spectroscopic data indicated that each different chromopeptide occurs twice for a total of eight chromophores on each oligomer. The tryptic digest data and the results from earlier experiments suggest that the protein may have two identical sets of four chromophores that comprise an energy-transfer unit within the protein. CD spectroscopy on phycocyanin 612 in the visible region of the spectrum was used to obtain information on the topography of these chromophores. Two chemicals, potassium permanganate and sodium thiocyanate, were used to alter the CD spectrum. The effects of both these chemicals suggested a close relationship between two of the four observed components in the visible CD spectrum of this biliprotein. This chromophore relationship is assigned to strong coupling of the dipoles of the two lowest-energy chromophores and produce exciton delocalization between these chromophores. Each dimeric protein has two identical delocalized pairs that produce spectral splitting and are the fluorescence emitters of the isolated protein. Based on this evidence and data from the literature, a tentative model is presented that shows the exciton migration route for phycocyanin 612. After excitation of the highest-energy chromophore, cryptoviolin, excitons are transferred by very weak dipole coupling to the highest-energy phycocyanobilin and from there by the same mechanism to the strongly coupled pair of phycocyanobilins. The identical process occurs on both halves of the protein." @default.
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• W2077504744 date "1988-07-01" @default.
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• W2077504744 title "The route of exciton migration in phycocyanin 612" @default.
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• W2077504744 doi "https://doi.org/10.1016/0005-2728(88)90087-4" @default.
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