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  • primary donor  (1)
  • water ligation  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Pulsed ENDOR of the photoexcited triplet states of bacteriochlorophyll a and of the primary donor P865 in reaction centers of Rhodobacter sphaeroides R-26 (1998)
    Springer
    Photosynthesis research 55 (1998), S. 189-197 
    Details
    ISSN: 1573-5079
    Schlagwort(e): bacterial reaction center ; charge transfer ; excitation delocalization ; ENDOR ; primary donor ; triplet states
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract The photoexcited triplet states of bacteriochlorophyll a, 3BChl a, and of the primary donor in reaction centers of Rhodobacter sphaeroides R-26, 3P865, are investigated by pulsed EPR and ENDOR spectroscopy. In 3P865 a splitting of ENDOR lines and reduction of corresponding positive and negative hyperfine couplings as compared with the monomeric 3BChl a is observed. This indicates an asymmetric distribution of the triplet excitation over the two BChl a moieties, PL and PM, forming 3P865. Based on the signs of the hyperfine couplings and on a comparison with the cation and anion radical of BChl a an assignment to nuclei in the different dimer halves is proposed. This yields an estimate for the extent of delocalization of the triplet excitation over PL and PM and for the charge transfer contribution of 3P865.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006030221445
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  • 2
    Digitale Medien
    Digitale Medien
    EPR and ENDOR studies of the water oxidizing complex of Photosystem II (1996)
    Springer
    Photosynthesis research 48 (1996), S. 227-237 
    Details
    ISSN: 1573-5079
    Schlagwort(e): manganese cluster ; multiline signal ; oxygen evolution ; S-states ; water ligation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract A comparative study of X-band EPR and ENDOR of the S2 state of photosystem II membrane fragments and core complexes in the frozen state is presented. The S2 state was generated either by continuous illumination at T=200 K or by a single turn-over light flash at T=273 K yielding entirely the same S2 state EPR signals at 10 K. In membrane fragments and core complex preparations both the multiline and the g=4.1 signals were detected with comparable relative intensity. The absence of the 17 and 23 kDa proteins in the core complex preparation has no effect on the appearance of the EPR signals. 1H-ENDOR experiments performed at two different field positions of the S2 state multiline signal of core complexes permitted the resolution of four hyperfine (hf) splittings. The hf coupling constants obtained are 4.0, 2.3, 1.1 and 0.6 MHz, in good agreement with results that were previously reported (Tang et al. (1993) J Am Chem Soc 115: 2382–2389). The intensities of all four line pairs belonging to these hf couplings are diminished in D2O. A novel model is presented and on the basis of the two largest hfc's distances between the manganese ions and the exchangeable protons are deduced. The interpretation of the ENDOR data indicates that these hf couplings might arise from water which is directly ligated to the manganese of the water oxidizing complex in redox state S2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00041013
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