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Macromolecular organization of chlorophyll a in aggregated chlorophyll ab protein complex as shown by circular dichroism at room and cryogenic temperatures
Authors:Richard PF Gregory  Sándor Demeter  Ágnes Faludi-Dániel
Institution:Institute of Plant Physiology, Biological Research Center, Hungarian Academy of Sciences, H-6701, Szeged Hungary
Abstract:This report concerns the large circular dichroic (CD) signal of intact chloroplasts of higher plants. The CD spectra of chloroplasts are compared with the aggregated form of the light-harvesting chlorophyll ab complex at 25°C and ?250°C. The light-harvesting chlorophyll aggregate has a CD of magnitude equal to or greater than chloroplasts, but of opposite sign, and it is not related to the CD of the unaggregated form, and hence its arrangement is an artefact compared to the arrangement in the chloroplast. We suggest that this preparation, which has pseudo-lamellar structure, is a clear example of a large CD signal being generated by macromolecular association. The asymmetry of organization in the chloroplast has an opposite sense to that of the aggregate, but affects only chlorophyll a, not chlorophyll b.
Keywords:Chlorophyll organization  Carotenoid  Circular dichroism  Light-harvesting chlorophyll-protein complex  (Chloroplast)
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