Plant and Cell Physiology Supplement
Abstract of the Annual Meeting of JSPP 2009
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Structural Analysis of Stacking of Bacteriochlorophyll c Macrocycles in Chlorosome of Green Photosynthetic Bacterium
*Yoshinori KakitaniYasushi KoyamaYuichi ShimoikedaToshihito NakaiHiroaki UtsumiTadashi ShimizuHiroyoshi Nagae
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Pages 0400

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Abstract
The stacking of the bacteriochlorophyll (BChl) c and the role of water in forming an aggregate, in chlorosome, were examined by 13C-NMR and 25Mg-NMR spectroscopies and X-ray diffraction: (1) "The weakly-overlapped dimers forming displaced layers" was selected out of six different stackings so far identified in the smaller aggregates of isomeric BChl c and the solid aggregate of an isomeric mixture of BChl c. The selection was based on the comparison between the intermolecular 13C magnetic-dipole correlations and the nearest-neighbor carbon-to-carbon close contacts. (2) The crucial role of water in stabilizing the aggregate was shown by tracing the dehydration processes and by comparison with the solid-aggregate X-ray diffraction pattern. Possible binding sites of water were located by structural simulation. (3) The dimer-based stacking was evidenced by 25Mg-NMR, which exhibited a pair of signals showing different quadrupole couplings, due to the presence or absence of water in the axial position.
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© 2009 by The Japanese Society of Plant Physiologists
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