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Puslapis 1 nuo 58 rezultatus
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
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
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
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
A dual role for plant quinone reductases in host-fungus interaction.
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Quinone reductases (QR, EC 1.5.6.2) are flavoproteins that protect organisms from oxidative stress. The function of plant QRs has not as yet been addressed in vivo despite biochemical evidence for their involvement in redox reactions. Here, using knock-out (KO) and overexpressing lines, we studied
Quinone perception in plants via leucine-rich-repeat receptor-like kinases
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Quinones are produced and sensed in all kingdoms of life1-4. Plants are primary producers of quinone1,2, but the role of quinone as a signalling agent in plants remains largely unknown. One well-documented role of quinone is in the induction of haustoria (specialized feeding
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
Inactivation of the open reading frame slr0399 in Synechocystis sp. PCC 6803 functionally complements mutations near the Q(A) niche of photosystem II. A possible role of Slr0399 as a chaperone for quinone binding.
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The Synechocystis sp. PCC 6803 triple mutant D2R8 with V247M/A249T/M329I mutations in the D2 subunit of the photosystem II is impaired in Q(A) function, has an apparently mobile Q(A), and is unable to grow photoautotrophically. Several photoautotrophic pseudorevertants of this mutant have been
Deficiency in phylloquinone (vitamin K1) methylation affects prenyl quinone distribution, photosystem I abundance, and anthocyanin accumulation in the Arabidopsis AtmenG mutant.
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Phylloquinone (vitamin K(1)) is synthesized in cyanobacteria and in chloroplasts of plants, where it serves as electron carrier of photosystem I. The last step of phylloquinone synthesis in cyanobacteria is the methylation of 2-phytyl-1,4-naphthoquinone by the menG gene product. Here, we report that
Changes in the redox potential of primary and secondary electron-accepting quinones in photosystem II confer increased resistance to photoinhibition in low-temperature-acclimated Arabidopsis.
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Exposure of control (non-hardened) Arabidopsis leaves for 2 h at high irradiance at 5 degrees C resulted in a 55% decrease in photosystem II (PSII) photochemical efficiency as indicated by F(v)/F(m). In contrast, cold-acclimated leaves exposed to the same conditions showed only a 22% decrease in
Crystallization and preliminary X-ray crystallographic analysis of NADPH: azodicarbonyl/quinone oxidoreductase, a plant zeta-crystallin.
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Arabidopsis thaliana P1 protein was crystallized using the hanging drop vapor-diffusion method in 0.1 M piperazine-1, 4-bis(2-ethanesulfonic acid) buffer, containing 14% polyethylene glycol 6000 and 0.2 M magnesium acetate at pH 6.5 and 20 degrees C. The crystals are orthorhombic and belong to the
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
Effects of low temperature on photoinhibition and singlet oxygen production in four natural accessions of Arabidopsis
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Low temperature decreases PSII damage in vivo, confirming earlier in vitro results. Susceptibility to photoinhibition differs among Arabidopsis accessions and moderately decreases after 2-week cold-treatment. Flavonols may alleviate photoinhibition. The rate of light-induced inactivation of
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