Two modes of inhibition by 2-heptyl-4-hydroxyquinoline-N-oxide of electron transport associated with photosystem 2 in spinach chloroplasts
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概要
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2-Heptyl-4-hydroxyquinoline-N-oxide (HOQNO) exerted two modes of inhibition on the Hill reaction in spinach chloroplasts. The first mode of inhibition by HOQNO, which developed rapidly and reversibly on addition of the inhibitor to chloroplasts, was observed in the Hill reaction with various electron acceptors and in photoreduction of methyl viologen with ascorbate as electron donor, but was not observed in methyl viologen photoreduction supported by reduced DPIP. Fifty percent inhibition of the Hill reaction was obtained with HOQNO at a low concentration of the order of 10^<-6> M. Besides the fast-developing inhibition, HOQNO caused a progressive decrease in the Hill activity during the reaction when ferrricyanide was used as electron acceptor. Similar time-dependent inactivation occurred when chloroplasts were incubated with HOQNO and ferricyanide in the dark. Chloroplasts, thus inactivated, showed lowered activity for ascorbate-supported methyl viologen photoreduction but had unchanged activity for photoreduction with reduced DPIP as electron donor. Progress of the time-dependent inhibition was accelerated by increasing the concentration of HOQNO or ferricyanide and was suppressed by addition of ferrocyanide. On changing the ratio of ferri- to ferrocyanide in the reaction medium, fifty percent protection of the Hill activity was obtained with a ferri- and ferrocyanide mixture giving the redox-potential of 560 mv. A simple kinetic model for the second time-dependent inhibition by HOQNO is presented.
- 日本植物生理学会の論文
著者
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Takamiya Atusi
Department Of Biophysics And Biochemistry Faculty Of Science University Of Tokyo:(present)department
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Takamiya Atusi
Department Of Biochemistry Faculty Of Science University Of Tokyo
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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