KMID : 0368419970400020125
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Journal of Plant Biology 1997 Volume.40 No. 2 p.125 ~ p.131
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Studies on Structure and Function of Photosystem 2 in Oxygenic Photosynthesis
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Cha Hyeon-Cheol
Tae Gun-Sik
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Abstract
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Cytochrome b-559 is an integral protein of the photosystem ¥± (PS¥±) reaction center from both plants and cyanobacteria. Cytochrome b-559 has the unique structure of a heme cross linked ¥á- and ¥â-subunit heterodimer. The stoichiometry of cytochrome b-559 (one or two copies) per the PS¥± reaction center has been the subject of controversy and the molar ratio of the heme group to the special chlorophyII P-680 has a number of significant implications on our understanding of the functional role of cytochrome b-559, the mechanism of electron donation in PS¥±, and the stoichiometry of the other redox-active reaction center components. In order to determine the number of the cytochrome b-559 heme in the PS¥± reaction center of Synechocystis sp. PCC 6803, the ¥á- and ¥â-subunits are covalently linked by use of the molecular genetic techniques. The resulting psbEF fusion mutant was able to grow photoautotrophically, implying that the PS¥± complexes are assembled and functional in thylakoids. This result supports the fact that there are two set of cytochrome b-559 in the PS¥± reaction center of Synechocystis sp. PCC 6803.
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