Molecular Structure of a High-Potential Form of Thylakoid Cytochrome b-559 as Determined by Radiation Inactivation
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概要
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Cytochrome b-559 in photosystem II can be characteristically converted from a high- to a low-potential form. Taking this response of Cyt b-559 as evidence for the denaturation of protein molecules, the sizes of the structures that stabilize the high-potential form of Cyt b-559 in PS II membranes and thylakoids from spinach were determined by radiation inactivation. When a target of 26 kDa was inactivated in PS II membranes. Cyt b-559 was converted to the low-potential form. The size was consistent with a molecular weight of Cyt b-559 in a proposed tetrameric structure that consists of two sets of 9.2-kDa and 4.3-kDa subunits [Widger et al. (1985) FEBS Lett. 191: 186-190]. In contrast to the functional size of 26 kDa in the PS II membranes, the functional size was 116 kDa in thylakoid membranes. The results suggest the presence of an extra 90-kDa electron carrier between a redox titrator outside the membranes and the Cyt b-559, which may not expose its active site to the surface of the thylakoids.
- 日本植物生理学会の論文
著者
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Asada Kozi
Research Institute for Food Science, Kyoto University
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Takahashi Masaaki
Department of Pharmacy, National Hospital Organization Nagoya Medical Center
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Asada Kozi
Research Institute For Food Science Kyoto University
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Takahashi Masaaki
Department Of Orthopaedic Surgery Hamamatsu University School Of Medicine
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Takahashi Masaaki
Department Of Applied Biological Sciences Graduate School Of Life And Environmental Sciences Osaka P
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Takahashi Masaaki
Department Of Applied Biological Chemistry Faculty Of Agriculture Osaka Prefecture University
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