Bacteriochlorophyll/imidazole and chlorophyll/imidazole complexes are negatively charged in an apolar environment

被引:9
作者
Alia
Matysik, J
Erkelens, C
Hulsbergen, FB
Gast, P
Lugtenburg, J
de Groot, HJM
机构
[1] Leiden Univ, Gorlaeus Labs, Leiden Inst Chem, NL-2300 RA Leiden, Netherlands
[2] Leiden Univ, Huygens Lab, Dept Biophys, NL-2300 RA Leiden, Netherlands
关键词
D O I
10.1016/S0009-2614(00)01117-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
600 MHz N-15-NMR and 2D homonuclear H-1-H-1 and heteronuclear H-1-N-15-NMR data for bacteriochlorophyll a/imidazole and chlorophyll a/imidazole have been recorded. Unambiguous assignments of the N-15 signals of the two nitrogens of imidazole ligated to the Mg of the bacteriochlorophyll a or chlorophyll a were obtained. It follows that the imidazole in complex is deprotonated, which implies that the chlorophyll/imidazole carries a full negative charge in the apolar solvent environment. This information is potentially useful in characterizing the nature of the magnesium-histidine interaction and the charge state of chlorophylls coordinated by histidine in photosynthetic pigment protein complexes. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:325 / 330
页数:6
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