Mar 1, 1976

Organization of Electron Transport in Photosystem II of Spinach Chloroplasts According to Chelator Inhibition Sites

Plant Physiology
R Barr, F L Crane


The organization of electron transport in photosystem II of spinach (Spinacia oleracea) chloroplasts was studied by means of various chelators and uncouplers. The partial reactions used included H(2)O-->methyl viologen, H(2)O-->silicomolybdic acid H(2)O-->ferricyanide, and H(2)O-->dimethylbenzoquinone. Three types of chelator inhibition were found (a) inhibition common to all pathways and presumably affecting the Mn or water oxidation site in photosystem II (salicylaldoxime, dithizone, acridine, 4,4,4-trifluoro-1-(2-thienyl)-1,1-butanedione, 4,4,4-trifluoro-0-(2-furyl)-1,3-butanedione; (b) strong inhibition of the H(2)O-->silicomolybdic acid pathway in presence of 3(3,4-dichlorophenyl)-1,1-dimethylurea by lipophilic chelators (bathocuproine, tertoctylcatechol) but stimulation by orthophenanthroline; and (c) 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone-insensitive dimethylbenzoquinone reduction inhibited by all phenanthrolines while ferricyanide reduction was remarkably stimulated by bathophenanthroline but inhibited by orthophenanthroline and bathocuproine. The action of lipophilic chelators on silicomolybdic acid reduction presumes the presence of a metallo protein in photosystem II. The differential action of bathophenanth...Continue Reading

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Mentioned in this Paper

Spinach preparation
Biochemical Pathway
Spinacia oleracea antigen
Spinacia oleracea
Electron Transport
Chelator (genus)
Chelating Agents

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