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- W2023217635 abstract "Bacteriochlorophyll–histidine complexes are ubiquitous in nature and are essential structural motifs supporting the conversion of solar energy into chemically useful compounds in a wide range of photosynthesis processes. A systematic density functional theory study of the NMR chemical shifts for histidine and for bacteriochlorophyll-a–histidine complexes in the light-harvesting complex II (LH2) is performed using the BLYP functional in combination with the 6-311++G(d,p) basis set. The computed chemical shift patterns are consistent with available experimental data for positive and neutralτ (Nτ protonated) crystalline histidines. The results for the bacteriochlorophyll-a–histidine complexes in LH2 provide evidence that the protein environment is stabilizing the histidine close to the Mg ion, thereby inducing a large charge transfer of ∼0.5 electronic equivalent. Due to this protein-induced geometric constraint, the Mg-coordinated histidine in LH2 appears to be in a frustrated state very different from the formal neutralπ (Nπ protonated) form. This finding could be important for the understanding of basic functional mechanisms involved in tuning the electronic properties and exciton coupling in LH2." @default.
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- W2023217635 date "2008-01-01" @default.
- W2023217635 modified "2023-10-11" @default.
- W2023217635 title "Protein-induced geometric constraints and charge transfer in bacteriochlorophyll–histidine complexes in LH2" @default.
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- W2023217635 doi "https://doi.org/10.1039/b810457c" @default.
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