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• W1968156940 endingPage "2637" @default.
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• W1968156940 abstract "The efficiency of triplet energy transfer from the special pair (P) to the carotenoid (C) in photosynthetic reaction centers (RCs) from a large family of mutant strains has been investigated. The mutants carry substitutions at positions L181 and/or M208 near chlorophyll-based cofactors on the inactive and active sides of the complex, respectively. Light-modulated electron paramagnetic resonance at 10 K, where triplet energy transfer is thermally prohibited, reveals that the mutations do not perturb the electronic distribution of P. At temperatures ≥ 70 K, we observe reduced signals from the carotenoid in most of the RCs with L181 substitutions. In particular, triplet transfer efficiency is reduced in all RCs in which a lysine at L181 donates a sixth ligand to the monomeric bacteriochlorophyll BB. Replacement of the native Tyr at M208 on the active side of the complex with several polar residues increased transfer efficiency. The difference in the efficiencies of transfer in the RCs demonstrates the ability of the protein environment to influence the electronic overlap of the chromophores and thus the thermal barrier for triplet energy transfer." @default.
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• W1968156940 date "1998-05-01" @default.
• W1968156940 modified "2023-10-11" @default.
• W1968156940 title "Protein Modifications Affecting Triplet Energy Transfer in Bacterial Photosynthetic Reaction Centers" @default.
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• W1968156940 doi "https://doi.org/10.1016/s0006-3495(98)77968-8" @default.
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