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Página 1 a partir de 98 resultados
Potato tuber succinate semialdehyde dehydrogenase: purification and characterization.
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Succinate semialdehyde dehydrogenase (SSADH) has been purified from potato tubers with 39% yield, 832-fold purification, and a specific activity of 6.5 units/mg protein. The final preparation was homogeneous as judged from native and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Gel
Cell-free synthesis of succinate dehydrogenase and mitochondrial adenosine triphosphatase of sweet potato.
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Polyadenylated mRNA was isolated from aged slices of sweet potato root tissue and translated in a wheat germ cell-free system. The synthesis of apoprotein of the flavoprotein subunit of succinate dehydrogenase and two of the subunits of mitochondrial adenosine triphosphatase were detected by
Nitric oxide inhibits succinate dehydrogenase-driven oxygen consumption in potato tuber mitochondria in an oxygen tension-independent manner.
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NO (nitric oxide) is described as an inhibitor of plant and mammalian respiratory chains owing to its high affinity for COX (cytochrome c oxidase), which hinders the reduction of oxygen to water. In the present study we show that in plant mitochondria NO may interfere with other respiratory
Citrate and succinate uptake by potato mitochondria.
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The uptake of [(14)C]citrate and [(14)C]succinate was studied in potato mitochondria (Solanum tuberosum var. Russet Burbank) using cellulose pore filtration and was found to occur by the same mechanisms as described for mammalian mitochondria. Potato mitochondria, in the absence of respiration, have
Transcription of succinate dehydrogenase subunit 4 (sdh4) gene in potato: detection of extensive RNA editing and co-transcription with cytochrome oxidase subunit III (cox3) gene.
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The potato (Solanum tuberosum L.) mitochondrial cox3/ sdh4 gene cluster was previously identified by heterologous hybridization using a Marchantia polymorpha sdh4 probe. In this work, this potato gene cluster was cloned, sequenced and its expression was evaluated. The gene sequence and gene locus
[Effect of antimycin A on succinate oxidase activity in potato tuber mitochondria, and the behavior of cytochromes b].
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Increase of membrane permeability of mitochondria isolated from water stress adapted potato cells.
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In order to gain some insight into mitochondria permeability under water stress, intact coupled mitochondria were isolated from water stress adapted potato cells and investigations were made of certain transport processes including the succinate/malate and ADP/ATP exchanges, the plant mitochondrial
Evidence for anion-translocating plant uncoupling mitochondrial protein in potato mitochondria.
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Transport properties of plant mitochondria from potato tubers were investigated using the swelling technique and membrane potential measurements. Proton-dependent swelling of fatty acid-depleted mitochondria in potassium acetate with valinomycin was possible only in the presence of fatty acids
Regulation of uncoupling protein activity in phosphorylating potato tuber mitochondria.
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In isolated potato tuber mitochondria, palmitic acid (PA) can induce a H+ leak inhibited by GTP in the phosphorylating (state 3) respiration but not in the resting (state 4) respiration. The PA-induced H+ leak is constant when state 3 respiration is decreased by an inhibition of the succinate uptake
Fatty acid-mediated uncoupling of potato tuber mitochondria.
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The present work examined whether the ATP/ADP carrier, other than the plant uncoupling mitochondrial protein, participates in free fatty acid-mediated uncoupling of potato tuber mitochondria. The basal respiration rate of succinate-energized mitochondria was stimulated by a low concentration of
Redox control of RNA synthesis in potato mitochondria.
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This study shows that the incorporation of radiolabelled UTP into RNA in Percoll-gadient-purified potato mitochondria is regulated by the redox state of the mitochondrial electron transport chain. An early indication that there might be a redox effect on RNA synthesis was a decrease in UTP
Regulation by magnesium of potato tuber mitochondrial respiratory activities.
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Dehydrogenase activities of potato tuber mitochondria and corresponding phosphorylation rates were measured for the dependence on external and mitochondrial matrix Mg2+. Magnesium stimulated state 3 and state 4 respiration, with significantly different concentrations of matrix Mg2+ required for
Cloning and characterization of the gene for the iron-sulfur subunit of succinate dehydrogenase from the violet root rot fungus, Helicobasidium mompa.
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The sdhB gene, encoding the iron-sulfur protein (Ip) subunit of succinate dehydrogenase (Sdh, EC 1.3.99.1), has been cloned from the violet root rot fungus, Helicobasidium mompa, and characterized. The promoter region contains a CCAAT box, TATA-like box, and CT-rich region. The gene is interrupted
Cyanide-resistant Respiration of Sweet Potato Mitochondria.
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The oxidation of malate and succinate by sweet potato mitochondria (Ipomoea batatas [L.] Lam.) was blocked only partly by inhibitors of complexes III (2-heptyl-4-hydroxyquinoline-N-oxide) and IV (cyanide and azide). The respiration insensitive to inhibitors of complexes III and IV was inhibited by
Ubiquinol-cytochrome c oxidoreductase of higher plants. Isolation and characterization of the bc1 complex from potato tuber mitochondria.
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A procedure is described for isolation of active ubiquinol-cytochrome c oxidoreductase (bc1 complex) from potato tuber mitochondria using dodecyl maltoside extraction and ion exchange chromatography. The same procedure works well with mitochondria from red beet and sweet potato. The potato complex
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