scholarly journals Chemiosmotic Energy Conservation in Dinoroseobacter shibae: Proton Translocation Driven by Aerobic Respiration, Denitrification, and Photosynthetic Light Reaction

2018 ◽  
Vol 9 ◽  
Author(s):  
Christian Kirchhoff ◽  
Matthias Ebert ◽  
Dieter Jahn ◽  
Heribert Cypionka
Keyword(s):  
Energy Conservation ◽  
Proton Translocation ◽  
Aerobic Respiration ◽  
Light Reaction ◽  
Dinoroseobacter Shibae ◽  
Photosynthetic Light Reaction

Artificial Energy Conservation in Bacterial Photosynthetic Electron Transport

1976 ◽  
Vol 31 (3-4) ◽  
pp. 152-156 ◽  
Author(s):  
Achim Trebst
Keyword(s):  
Electron Transport ◽  
Energy Conservation ◽  
Proton Pump ◽  
Redox Reaction ◽  
Electron Flow ◽  
Proton Translocation ◽  
Photosynthetic Electron Transport ◽  
Reaction Cycle ◽  
Atp Formation ◽  
Internal Electron

Abstract In photosynthesis of chloroplasts and bacterial chromatophores an induced artificial electron flow bypass may restore the inhibition of electron flow and of coupled ATP formation by two possible mechanisms. An artificial transmembrane electron flow bypass will lead to artificial energy conservation, when the redox reaction cycle of the added mediator across the membrane acts as proton pump. In an artificial internal electron flow bypass an inhibited native energy conservation may be reactivated; here an electron flow bypass induced by the mediator in the inside space restores the native proton translocation. The inhibition and the restoration of electron flow by antimycin, dibromothymoquinone and valinomycin is compared.

scholarly journals Respiration-driven proton translocation in Escherichia coli (Short Communication)

1973 ◽  
Vol 136 (1) ◽  
pp. 217-220 ◽  
Author(s):  
Hugh G. Lawford ◽  
Bruce A. Haddock
Keyword(s):  
Escherichia Coli ◽  
Energy Conservation ◽  
Respiratory Chain ◽  
Short Communication ◽  
Proton Translocation ◽  
Exponential Phase ◽  
Glycerol Oxidation ◽  
Intact Cells ◽  
E Coli

Measurements were made of the stoicheiometry of respiration-driven proton translocation coupled to the oxidation of NAD(P)-linked or flavin-linked substrates in intact cells of Escherichia coli. Observed stoicheiometries (→H+/O quotient; Mitchell, 1966) were approx. 4 with l-malate as substrate and approx. 2 for succinate, d-lactate and glycerol oxidation. It is concluded that the potential number of equivalent energy-conservation sites associated with the respiratory chain is 2 in aerobically grown cells of E. coli harvested during the exponential phase of growth.

scholarly journals Oxygen consumption of individual cable bacteria

2021 ◽  
Vol 7 (7) ◽  
pp. eabe1870
Author(s):  
Stefano Scilipoti ◽  
Klaus Koren ◽  
Nils Risgaard-Petersen ◽  
Andreas Schramm ◽  
Lars Peter Nielsen
Keyword(s):  
Oxidative Stress ◽  
Oxygen Consumption ◽  
Energy Conservation ◽  
Electron Donor ◽  
Aerobic Respiration ◽  
Aquatic Sediments ◽  
Consumption Rates ◽  
Electrical Signaling

The electric wires of cable bacteria possibly support a unique respiration mode with a few oxygen-reducing cells flaring off electrons, while oxidation of the electron donor and the associated energy conservation and growth is allocated to other cells not exposed to oxygen. Cable bacteria are centimeter-long, multicellular, filamentous Desulfobulbaceae that transport electrons across oxic-anoxic interfaces in aquatic sediments. From observed distortions of the oxic-anoxic interface, we derived oxygen consumption rates of individual cable bacteria and found biomass-specific rates of unheard magnitude in biology. Tightly controlled behavior, possibly involving intercellular electrical signaling, was found to generally keep <10% of individual filaments exposed to oxygen. The results strengthen the hypothesis that cable bacteria indeed have evolved an exceptional way to take the full energetic advantages of aerobic respiration and let >90% of the cells metabolize in the convenient absence of oxidative stress.

Effects of soil moisture on the photosynthetic light reaction ofRosa xanthinaL. in a loess hilly region

2016 ◽  
Vol 36 (16) ◽  
Author(s):  
夏宣宣 XIA Xuanxuan ◽  
张淑勇 ZHANG Shuyong ◽  
张光灿 ZHANG Guangcan ◽  
方立东 FANG Lidong ◽  
张松松 ZHANG Songsong ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Light Reaction ◽  
Hilly Region ◽  
Photosynthetic Light Reaction ◽  
Loess Hilly Region

scholarly journals Respiration-driven proton translocation by yeast mitochondria with differing efficiencies of oxidative phosphorylation

1973 ◽  
Vol 134 (4) ◽  
pp. 1045-1049 ◽  
Author(s):  
J. A. Downie ◽  
P. B. Garland
Keyword(s):  
Oxidative Phosphorylation ◽  
Energy Conservation ◽  
Candida Utilis ◽  
Proton Translocation ◽  
Yeast Mitochondria

Measurements were made of the stoicheiometry of proton translocation coupled to respiration in mitochondria from Candida utilis where the number of functional energy-conservation sites between intramitochondrial NADH and oxygen was one in a mutant with a novel oxidase (Downie & Garland, 1972), two in sulphate-deficient cells (Haddock & Garland, 1971) or three in glycerol-limited cells (Light & Garland, 1971). The stoicheiometries of protons translocated per atom of oxygen utilized (i.e. →H+/2e− ratio; Mitchell, 1966) were close to 2.0, 4.0 and 6.0 respectively. Thus by using the same substrate (intramitochondrial NADH) and oxygen throughout, the →H+/2e− ratio is shown to be 2.0 per energy-conservation site when the number of such sites is varied from one to three.

scholarly journals The Acclimation of Phaeodactylum tricornutum to Blue and Red Light Does Not Influence the Photosynthetic Light Reaction but Strongly Disturbs the Carbon Allocation Pattern

PLoS ONE ◽  
2014 ◽  
Vol 9 (8) ◽  
pp. e99727 ◽  
Author(s):  
Anne Jungandreas ◽  
Benjamin Schellenberger Costa ◽  
Torsten Jakob ◽  
Martin von Bergen ◽  
Sven Baumann ◽  
...  
Keyword(s):  
Phaeodactylum Tricornutum ◽  
Carbon Allocation ◽  
Red Light ◽  
Allocation Pattern ◽  
Light Reaction ◽  
Photosynthetic Light Reaction

scholarly journals Two Tyrosyl Radicals Stabilize High Oxidation States in Cytochrome C Oxidase for Efficient Energy Conservation and Proton Translocation

2012 ◽  
Vol 102 (3) ◽  
pp. 466a
Author(s):  
Denis L. Rousseau ◽  
Michelle A. Yu ◽  
Tsuyoshi Egawa ◽  
Kyoko Shinzawa-Itoh ◽  
Shinya Yoshikawa ◽  
...  
Keyword(s):  
Cytochrome C ◽  
Energy Conservation ◽  
Cytochrome C Oxidase ◽  
Proton Translocation ◽  
Oxidation States ◽  
Efficient Energy ◽  
Tyrosyl Radicals ◽  
High Oxidation
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