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Interaction of quinones with Arabidopsis thaliana thioredoxin reductase.

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In view of the ubiquitous role of the thioredoxin/thioredoxin reductase (TRX/TR) system in living cells, the interaction of Arabidopsis thaliana NADPH-thioredoxin reductase (EC 1.6.4.5) with quinones, an important class of redox cycling and alkylating xenobiotics, was studied. The steady-state

Analytical ultracentrifugation and preliminary X-ray studies of the chloroplast envelope quinone oxidoreductase homologue from Arabidopsis thaliana.

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Quinone oxidoreductases reduce a broad range of quinones and are widely distributed among living organisms. The chloroplast envelope quinone oxidoreductase homologue (ceQORH) from Arabidopsis thaliana binds NADPH, lacks a classical N-terminal and cleavable chloroplast transit peptide, and is

Overexpression of quinone reductase from Salix matsudana Koidz enhances salt tolerance in transgenic Arabidopsis thaliana.

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Quinone reductase (QR) is an oxidative-related gene and few studies have focused on its roles concerning salt stress tolerance in plants. In this study, we cloned and analyzed the QR gene from Salix matsudana, a willow with tolerance of moderate salinity. The 612-bp cDNA corresponding to SmQR

Quinone- and nitroreductase reactions of Thermotoga maritima thioredoxin reductase.

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The Thermotoga maritima NADH:thioredoxin reductase (TmTR) contains FAD and a catalytic disulfide in the active center, and uses a relatively poorly studied physiological oxidant Grx-1-type glutaredoxin. In order to further assess the redox properties of TmTR, we used series of quinoidal and

Nitroreductase reactions of Arabidopsis thaliana thioredoxin reductase.

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Arabidopsis thaliana NADPH:thioredoxin reductase (TR, EC 1.6.4.5) catalyzed redox cycling of aromatic nitrocompounds, including the explosives 2,4,6-trinitrotoluene and tetryl, and the herbicide 3,5-dinitro-o-cresol. The yield of nitro anion radicals was equal to 70-90%. Redox cycling of tetryl was

Functional detection of chemopreventive glucosinolates in Arabidopsis thaliana.

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Natural isothiocyanates, derived from glucosinolates by myrosinase-catalyzed hydrolysis, are potent chemopreventive agents that favorably modify carcinogen metabolism in mammals by inhibiting metabolic activation of carcinogens and/or by inducing carcinogen-detoxifying enzymes. Methylsulfinylalkyl

Mitochondria-targeted quinones suppress the generation of reactive oxygen species, programmed cell death and senescence in plants.

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This work focuses on the effect of mitochondria-targeted quinones (SkQs) on plants. SkQs with antioxidant properties are accumulated in the mitochondria of pea cells and suppress the generation of reactive oxygen species. At nanomolar concentrations, SkQs prevented the death of pea leaf epidermal or

The pea SAD short-chain dehydrogenase/reductase: quinone reduction, tissue distribution, and heterologous expression.

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The pea (Pisum sativum) tetrameric short-chain alcohol dehydrogenase-like protein (SAD) family consists of at least three highly similar members (SAD-A, -B, and -C). According to mRNA data, environmental stimuli induce SAD expression. The aim of this study was to characterize the SAD proteins by

A novel NADPH:diamide oxidoreductase activity in arabidopsis thaliana P1 zeta-crystallin.

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The zeta-crystallin (ZCr) gene P1 of Arabidopsis thaliana, known to confer tolerance toward the oxidizing drug 1,1'-azobis(N, N-dimethylformamide) (diamide) to yeast [Babiychuk, E., Kushnir, S., Belles-Boix, E., Van Montagu, M. & Inzé, D. (1995) J. Biol. Chem. 270, 26224], was expressed in

Chitinophaga taiwanensis sp. nov., isolated from the rhizosphere of Arabidopsis thaliana.

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An aerobic, Gram-stain-negative, rod-shaped bacterium (strain CC-ALB-1(T)) was isolated from the rhizosphere of Arabidopsis thaliana. Strain CC-ALB-1(T) was able to grow at 20-30 °C, pH 5.0-8.0 and with up to 1.0% (w/v) NaCl. 16S rRNA gene sequence analysis showed that strain CC-ALB-1(T) had the

Cloning and heterologous expression of NAD(P)H:quinone reductase of Arabidopsis thaliana, a functional homologue of animal DT-diaphorase.

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In higher plants, NAD(P)H:quinone reductase (NQR) is the only flavoreductase known to reduce quinone substrates directly to hydroquinones by a two-electron reaction mechanism. This enzymatic activity is believed to protect aerobic organisms from the oxidative action of semiquinones. For this reason

Electron transfer reactivity of the Arabidopsis thaliana sulfhydryl oxidase AtErv1.

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The redox reactivity of the three disulfide bridges and the flavin present in each protomer of the wild-type Arabidopsis thaliana mitochondrial sulfhydryl oxidase (AtErv1) homodimer has been investigated. Pulse radiolytically produced CO2- radical ions were found to reduce the disulfide bridges to

Crystal Structure of the Chloroplastic Oxoene Reductase ceQORH from Arabidopsis thaliana.

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Enzymatic and non-enzymatic peroxidation of polyunsaturated fatty acids give rise to accumulation of aldehydes, ketones, and α,β-unsaturated carbonyls of various lengths, known as oxylipins. Oxylipins with α,β-unsaturated carbonyls are reactive electrophile species and are toxic. Cells have evolved

Abolition of photosystem I cyclic electron flow in Arabidopsis thaliana following thermal-stress.

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Heat tolerance of Arabidopsis thaliana (WT) and its mutants, crr2-2, lacking NADPH-dehydrogenase (Ndh-pathway), and pgr5, deficient in proton gradient regulation and/or ferredoxin-quinone-reductase (FQR-pathway), was studied from 30 to 46°C. Chlorophyll fluorescence revealed that thermal damage to

Novosphingobium arabidopsis sp. nov., a DDT-resistant bacterium isolated from the rhizosphere of Arabidopsis thaliana.

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An aerobic, Gram-stain-negative, rod-shaped, DDT-resistant bacterium, designated strain CC-ALB-2(T), was isolated from the Arabidopsis thaliana rhizosphere. Strain CC-ALB-2(T) was able to grow at 25-37 °C, at pH 5.0-8.0, with 1.0% (w/v) NaCl and tolerate up to 200 mg l(-1) DDT. 16S rRNA gene

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