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Light and Heat Induced Denaturation of Photosystem Ⅱ Core Antenna Complex CP47
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Light and heat induced denaturation of CP47, the core antenna complex of photosystem Ⅱ purified from spinach, were investigated using absorption and circular dichroism spectra.Light caused the destruction of chlorophyll a and excitonic interaction of chlorophyll a in CP47, while the protein secondary structure was not apparently changed.Heat induced the destruction of protein secondary structure and excitonic interaction of chlorophyll a, but the chlorophyll a molecule was not damaged.The results suggest that both the chlorophyll a molecular structure and the protein native conformation are necessary for excitonic interaction of chlorophyll a and the energy transfer function of the chlorophyll a binding protein.
photosystem Ⅱcore antennaCP47circular dichroism
WANG Jushuo、SHAN Jixiu、XU Qiang、GONG Yandao、KUANG Tingyun
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Department of Biological Sciences and Biotechnology,State Key Laboratory of Biomembrane and Membrane Biotechnology,Tsinghua University,Beijing 100084
Photosynthesis Research Center,Institute of Botany,Chinese Academy of Sciences,Beijing 100093
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