Role of the photosynthetic electron transfer chain in electrogenic activity of cyanobacteria

2011 ◽  
Vol 91 (2) ◽  
pp. 377-385 ◽  
Author(s):  
John M. Pisciotta ◽  
YongJin Zou ◽  
Ilia V. Baskakov
Keyword(s):  
Electron Transfer ◽  
Electron Transfer Chain ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer

The Use of O2-Evolving Subchloroplast Particles to Study Acceptor and Inhibitor Sites on the Reducing Side of Photosystem II

1983 ◽  
Vol 38 (9-10) ◽  
pp. 793-798 ◽  
Author(s):  
W. S. Cohen ◽  
J. R. Barton
Keyword(s):  
Electron Transfer ◽  
Electron Transport ◽  
Photosystem Ii ◽  
Differential Sensitivity ◽  
Electron Transfer Chain ◽  
Plastoquinone Pool ◽  
Photosystem Ii Activity ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer ◽  
Photosystem Ii Particles

Photosystem II particles that retain the ability to evolve O2 have been used to examine acceptor and inhibitor sites in the photosynthetic electron transfer chain between Q and plastoquinone. Employing the water to dichlorobenzoquinone reaction to assay photosystem II activity, we have demonstrated that electron transport in thylakoids and particles is equally sensitive to inhibition by DCMU. dinoseb, metribuzin, HQNO and DBMIB. Based on differential sensitivity to inhibition by DCMU vs. HQNO or DBMIB, we suggest that when synthetic quinones, e.g. 2,6-dichlorobenzoquinone operate as Hill reagents in particles they are reduced primarily by the plastoquinone pool. When synthetic quinones, e.g. 5,6-methylenedioxy-2,3-dimethyl benzoquinone act as autoxidizable acceptors they accept electron from the Q/B complex at a point that is located between the DCMU and HQNO (DBMIB) inhibition sites.

scholarly journals Chlororespiration

2000 ◽  
Vol 355 (1402) ◽  
pp. 1541-1547 ◽  
Author(s):  
Peter J. Nixon
Keyword(s):  
Electron Transfer ◽  
Thylakoid Membrane ◽  
Redox State ◽  
Original Model ◽  
Current Status ◽  
Electrochemical Gradient ◽  
Electron Transfer Chain ◽  
Plastoquinone Pool ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer

The term ‘chlororespiration’ is used to describe the activity of a putative respiratory electron transfer chain within the thylakoid membrane of chloroplasts and was originally proposed by Bennoun in 1982 to explain effects on the redox state of the plastoquinone pool in green algae in the absence of photosynthetic electron transfer. In his original model, Bennoun suggested that the plastoquinone pool could be reduced through the action of a NAD(P)H dehydrogenase and could be oxidized by oxygen at an oxidase. At the same time an electrochemical gradient would be generated across the thylakoid membrane. This review describes the current status of the chlororespiration model in light of the recent discoveries of novel respiratory components within the chloroplast thylakoid membrane.

Reactions of Isocytochromec2in the Photosynthetic Electron Transfer Chain ofRhodobacter sphaeroides†

Biochemistry ◽  
1997 ◽  
Vol 36 (4) ◽  
pp. 903-911 ◽  
Author(s):  
Vernon C. Witthuhn, ◽  
Jiliang Gao ◽  
Sangjin Hong ◽  
Steven Halls ◽  
Marc A. Rott ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Electron Transfer Chain ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer

An active photosynthetic electron transfer chain required for mcyD transcription and microcystin synthesis in Microcystis aeruginosa PCC7806

Ecotoxicology ◽  
2011 ◽  
Vol 21 (3) ◽  
pp. 811-819 ◽  
Author(s):  
Emma Sevilla ◽  
Beatriz Martin-Luna ◽  
M. Teresa Bes ◽  
Maria F. Fillat ◽  
M. Luisa Peleato
Keyword(s):  
Electron Transfer ◽  
Microcystis Aeruginosa ◽  
Electron Transfer Chain ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer

Recent Advances in the Mode of Action of Diphenyl Ethers and Related Herbicides

1990 ◽  
Vol 45 (5) ◽  
pp. 503-511 ◽  
Author(s):  
René Scalla ◽  
Michel Matringe ◽  
Jean-Michel Camadro ◽  
Pierre Labbe
Keyword(s):  
Electron Transfer ◽  
Singlet Oxygen ◽  
Mode Of Action ◽  
Membrane Lipids ◽  
Protoporphyrin Ix ◽  
Protoporphyrinogen Oxidase ◽  
Electron Transfer Chain ◽  
Diphenyl Ethers ◽  
Transfer Chain ◽  
Photosynthetic Electron Transfer

Several hypotheses have been proposed to explain the light-dependent phytotoxicity of diphenyl ethers and related herbicides: inhibition of photosynthesis; activation of herbicides by light, by the photosynthetic electron transfer chain or by excited forms of carotenoids; and interaction with the biosynthesis of tetrapyrrole pigments. It is shown that the most likely mode of action consists in inhibiting the enzyme protoporphyrinogen oxidase. As a consequence, protoporphyrinogen is oxidized non-enzymatically to protoporphyrin IX. The latter molecule is a powerful photosensitizer, able to generate singlet oxygen in the light and thus to induce peroxidative destruction of membrane lipids.

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