scholarly journals Functional Redundancy in Perchlorate and Nitrate Electron Transport Chains and Rewiring Respiratory Pathways to Alter Terminal Electron Acceptor Preference

2018 ◽  
Vol 9 ◽  
Author(s):  
Ouwei Wang ◽  
Ryan A. Melnyk ◽  
Misha G. Mehta-Kolte ◽  
Matthew D. Youngblut ◽  
Hans K. Carlson ◽  
...  
Keyword(s):  
Electron Transport ◽  
Electron Acceptor ◽  
Functional Redundancy ◽  
Terminal Electron Acceptor ◽  
Electron Transport Chains

scholarly journals Functional anaerobic electron transport linked to the reduction of nitrate and fumarate in membranes from Escherichia coli as demonstrated by quenching of atebrin fluorescence

1975 ◽  
Vol 152 (3) ◽  
pp. 655-659 ◽  
Author(s):  
B A Haddock ◽  
M W Kendall-Tobias
Keyword(s):  
Escherichia Coli ◽  
Electron Transport ◽  
Carbon Source ◽  
Electron Acceptor ◽  
Functional Organization ◽  
Terminal Electron Acceptor ◽  
Membrane Particles ◽  
Electron Transport Chains ◽  
Anaerobic Electron Transport ◽  
Energy Dependent

Measurements were made of energy-dependent quenching of atebrin fluorescence in membrane particles prepared from Escherichia coli grown anaerobically with glycerol as carbon source in the presence of either nitrate or fumarate. It is concluded that this technique can be used to study the functional organization of the anaerobic proton-translocating electron-transport chains that use nitrate or fumarate as terminal electron acceptor.

scholarly journals Lactobacillus plantarum WCFS1 Electron Transport Chains

2009 ◽  
Vol 75 (11) ◽  
pp. 3580-3585 ◽  
Author(s):  
R. J. W. Brooijmans ◽  
W. M. de Vos ◽  
J. Hugenholtz
Keyword(s):  
Electron Transport ◽  
Lactobacillus Plantarum ◽  
Consumption Rate ◽  
Growth Media ◽  
Terminal Electron Acceptor ◽  
Glucose Levels ◽  
Transport Chain ◽  
Electron Transport Chains ◽  
Cofactor Biosynthesis ◽  
Isogenic Mutants

ABSTRACT Lactobacillus plantarum WCFS1 requires both heme and menaquinone to induce respiration-like behavior under aerobic conditions. The addition of these compounds enhanced both biomass production, without progressive acidification, and the oxygen consumption rate. When both heme and menaquinone were present, L. plantarum WCFS1 was also able to reduce nitrate. The ability to reduce nitrate was severely inhibited by the glucose levels that are typically found in L. plantarum growth media (1 to 2% [vol/vol] glucose). In contrast, comparable mannitol levels did not inhibit the reduction of nitrate. L. plantarum reduced nitrate with concomitant formation of nitrite and ammonia. Genes that encode a bd-type cytochrome (cydABCD) and a nitrate reductase (narGHJI) were identified in the genome of L. plantarum. The narGHJI operon is part of a cluster of genes that includes the molybdopterin cofactor biosynthesis genes and narK. Besides a menaquinone source, isogenic mutants revealed that cydA and ndh1 are required for the aerobic-respiration-like response and narG for nitrate reduction. The ndh1 mutant was still able to reduce nitrate. The existence of a nonredundant branched electron transport chain in L. plantarum WCFS1 that is capable of using oxygen or nitrate as a terminal electron acceptor is proposed.

Fumarate is a terminal electron acceptor in the mammalian electron transport chain

Science ◽  
2021 ◽  
Vol 374 (6572) ◽  
pp. 1227-1237
Author(s):  
Jessica B. Spinelli ◽  
Paul C. Rosen ◽  
Hans-Georg Sprenger ◽  
Anna M. Puszynska ◽  
Jessica L. Mann ◽  
...  
Keyword(s):  
Electron Transport ◽  
Electron Acceptor ◽  
Electron Transport Chain ◽  
Terminal Electron Acceptor ◽  
Transport Chain

Effects of Difenzoquat on Photoreactions and Respiration in Wheat (Triticum aestivum) and Wild Oat (Avena fatua)

Weed Science ◽  
1983 ◽  
Vol 31 (5) ◽  
pp. 693-699 ◽  
Author(s):  
Blaik P. Halling ◽  
Richard Behrens
Keyword(s):  
Triticum Aestivum ◽  
Electron Transport ◽  
Electron Acceptor ◽  
Photosynthetic Electron Transport ◽  
Significant Inhibition ◽  
Avena Fatua ◽  
Wild Oat ◽  
Leaf Chlorosis ◽  
Acceptor Activity ◽  
Proton Uptake

Experiments were conducted with isolated protoplasts of wild oat (Avena fatuaL. # AVEFA) and isolated chloroplasts of wild oat and wheat (Triticum aestivumL.), to determine if the methyl sulfate salt of difenzoquat (1,2-dimethyl-3,5-diphenyl-1H-pyrazolium) might influence photoreactions in these species. Difenzoquat did not affect CO2fixation, uncoupled electron transport, or proton uptake. At concentrations of 0.5 mM and 1 mM, difenzoquat caused a slight, but statistically significant, inhibition of photophosphorylation. Experiments assaying coupled electron transport indicated that inhibition of photophosphorylation occurred not through uncoupling, but by an energy-transfer inhibition. This same effect was observed in isolated mitocondria of both species, with about 50% inhibition of state 3 respiration rates occurring with 10 μM difenzoquat. However, no important differentials were observed in the relative susceptibilities of wheat and wild oat mitochondria. Difenzoquat also functioned as a weak autooxidizing electron acceptor in photosynthetic electron transport. Therefore, difenzoquat-induced leaf chlorosis and necrosis may result from a bipyridilium-type electron acceptor activity if sufficient herbicide is absorbed.

Effects of terminal electron acceptor strength on film morphology and ternary memory performance of triphenylamine donor based devices

2013 ◽  
Vol 1 (24) ◽  
pp. 3816 ◽  
Author(s):  
Hao Zhuang ◽  
Qijian Zhang ◽  
Yongxiang Zhu ◽  
Xufeng Xu ◽  
Haifeng Liu ◽  
...  
Keyword(s):  
Electron Acceptor ◽  
Memory Performance ◽  
Film Morphology ◽  
Terminal Electron Acceptor

Electron transport pathways for the oxidation of endogenous substrate(s) in Acidithiobacillus ferrooxidans

2006 ◽  
Vol 52 (4) ◽  
pp. 317-327 ◽  
Author(s):  
Yongqiang Chen ◽  
Isamu Suzuki
Keyword(s):  
Electron Transport ◽  
Electron Acceptor ◽  
Acidithiobacillus Ferrooxidans ◽  
Complex I ◽  
Iron Chelators ◽  
Endogenous Respiration ◽  
Sugar Alcohols ◽  
Transport Pathways ◽  
Endogenous Substrate ◽  
Transport Inhibitors

Oxidation of endogenous substrate(s) of Acidithiobacillus ferrooxidans with O2 or Fe3+ as electron acceptor was studied in the presence of uncouplers and electron transport inhibitors. Endogenous substrate was oxidized with a respiratory quotient (CO2 produced/O2 consumed) of 1.0, indicating its carbohydrate nature. The oxidation was inhibited by complex I inhibitors (rotenone, amytal, and piericidin A) only partially, but piericidin A inhibited the oxidation with Fe3+ nearly completely. The oxidation was stimulated by uncouplers, and the stimulated activity was more sensitive to inhibition by complex I inhibitors. HQNO (2-heptyl-4-hydroxyquinoline N-oxide) also stimulated the oxidation, and the stimulated respiration was more sensitive to KCN inhibition than uncoupler stimulated respiration. Fructose, among 20 sugars and sugar alcohols including glucose and mannose, was oxidized with a CO2/O2 ratio of 1.0 by the organism. Iron chelators in general stimulated endogenous respiration, but some of them reduced Fe3+ chemically, introducing complications. The results are discussed in view of a branched electron transport system of the organism and its possible control.Key words: Acidithiobacillus ferrooxidans, endogenous respiration, uncouplers, electron transport.

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