Putative Second Binding Site of DCMU on the Oxidizing Side of Photosystem II in Photosystem II Membranes Depleted of Functional Mn
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概要
- 論文の詳細を見る
The effects of DCMU on the oxidizing side of PS II were studied with Triton-solubilized PS II membranes depleted of functional Mn. 3-(3,4-dichlorophenyl)- 1,1-dimethylurea (DCMU) non-competitively inhibited the diphenylcarbazide-supported (DPC-supported) photoreduction of silicomolybdate (SiMo) at concentrations more than ten times higher than that required for inhibition of the DPC-supported photoreduction of 2,6-dichlorophenolindophenol (DCIP). The maximum fluorescence intensity was also reduced by DCMU at a similar concentration to that required for the inhibition of the SiMo photoreduction. These findings suggest two inhibitory sites of action of DCMU in PS II: one on the reducing side and one on the oxidizing side of PS II. The inhibition constant for DCMU in the DPC-supported SiMo-photoreduction was 10μM in every examination. The extent of inhibition was attenuated by modifications of the PS II oxidizing side by the presence of functional Mn, by photoinhibition and by chemical modifications of histidine residues and acidic amino acid residues. Our results suggest that DCMU binds to the PS II oxidizing side near Z, D and the high-affinity Mn-binding sites.
- 日本植物生理学会の論文
著者
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INOUE Hiroshi
Department of Internal Medicine, University of Toyama
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Kamachi Hiroyuki
Department of Environmental Biology and Chemistry, Faculty of science, Toyama University
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Tamura N
Faculty Of Human Environmental Science Fukuoka Women's University
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Tamura Noriaki
Department Of Biology Faculty Of Science Kyushu University 33:(present)department Of Agronomy Univer
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Inoue H
Department Of General Thoracic Surgery Tokai University School Of Medicine
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KAMACHI Hiroyuki
Graduate School of Science and Engineering, University of Toyama
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Kamachi Hiroyuki
Graduate School Of Science And Engineering University Of Toyama
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Kamachi Hiroyuki
Department Of Environmental Biology And Chemistry Faculty Of Science Toyama University
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Inoue Hiroshi
Department Of Electrical And Electronic Engineering Akita University
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Kamachi Hiroyuki
Department Of Environmental Biology And Chemistry Faculty Of Science University Of Toyama
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Inoue H
Univ. Electro‐communications Chofu Jpn
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Inoue Hiroshi
Departmcnt Of Biology Faculty Of Science Kyushu University:(present)department Of Biology Kyushu Den
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Inoue Hiroshi
Department Of Thoracic Surgery Tokai University
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Inoue Hiroshi
Deparment of Neurosurgery, Gunma University School of Medicine and Gamma Unit Center, Hidaka Hospital
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