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Stranica 1 iz 30 rezultatima
Homologues of yeast and bacterial rotenone-insensitive NADH dehydrogenases in higher eukaryotes: two enzymes are present in potato mitochondria.
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Two different cDNAs, homologous to genes for rotenone-insensitive NADH dehydrogenases of bacteria and yeast, were isolated from potato. The encoded proteins, called NDA and NDB, have calculated molecular masses of 55 and 65 kDa, respectively. The N-terminal parts show similarity to mitochondrial
Specific interaction of cytokinins and their analogs with rotenone-sensitive internal NADH dehydrogenase in potato tuber mitochondria.
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Effects of cytokinins were studied on rotenone-sensitive NADH dehydrogenase in mitochondria from fresh potato tubers (Solanum tuberosum), in consideration of the operation of external and rotenone-insensitive internal NADH dehydrogenases that has not been fully accounted for in previous studies. In
Antimycin A treatment decreases respiratory internal rotenone-insensitive NADH oxidation capacity in potato leaves.
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BACKGROUND
The plant respiratory chain contains several energy-dissipating enzymes, these being type II NAD(P)H dehydrogenases and the alternative oxidase, not present in mammals. The physiological functions of type II NAD(P)H dehydrogenases are largely unclear and little is known about their
Oxidation of Reduced Nicotinamide Adenine Dinucleotide Phosphate by Potato Mitochondria: INHIBITION BY SULFHYDRYL REAGENTS.
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Potato tuber mitochondria oxidized exogenous NADH and exogenous NADPH at similar rates; the electron transfer inhibitor rotenone did not inhibit the oxidation of either substrate. Submitochondrial particles, prepared from potato tuber mitochondria, exhibited a greater capacity to oxidize NADH than
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
Sensitivities of the alternative respiratory components of potato tuber mitochondria to thiol reagents and Ca2+.
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Plant mitochondria differ from those of mammals, since they incorporate an alternative electron transport pathway, which branches at ubiquinol to an alternative oxidase (AOX), characteristically inhibited by salicylhydroxamic acid (SHAM). Another feature of plant mitochondria is that besides complex
Ubiquinone-1 Induces External Deamino-NADH Oxidation in Potato Tuber Mitochondria.
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The addition of ubiquinone-1 (UQ-1) induced Ca2+-independent oxidation of deamino-NADH and NADH by intact potato (Solanum tuberosum L. cv Bintje) tuber mitochondria. The induced oxidation was coupled to the generation of a membrane potential. Measurements of NAD+-malate dehydrogenase activity
Purification of the NADH:ubiquinone oxidoreductase (complex I) of the respiratory chain from the inner mitochondrial membrane of Solanum tuberosum.
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The plant NADH:ubiquinone oxidoreductase (or complex I) was isolated from potato (Solanum tuberosum) mitochondria. The multisubunit enzyme was solubilized with detergents, Triton X-100 and 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate (CHAPS), out of the inner mitochondrial membranes and
Structural factors of rotenone required for inhibition of various NADH-ubiquinone oxidoreductases.
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We performed a structure-activity study of a series of synthetic rotenone analogues to elucidate the structural factors of rotenone required for inhibition and to probe the structural properties of the rotenone binding site of various NADH-ubiquinone oxidoreductases (NDH), including both
Membrane-Associated NAD-Dependent Isocitrate Dehydrogenase in Potato Mitochondria.
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The oxidation isotherms for citrate and isocitrate by potato (Solanum tuberosum var. Russet Burbank) mitochondria in the presence of NAD differ markedly. Citrate oxidation shows positively cooperative kinetics with a sigmoid isotherm, whereas isocitrate oxidation shows Michaelis-Menten kinetics at
Comparison of the inhibitory action of natural rotenone and its stereoisomers with various NADH-ubiquinone reductases.
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Two stereoisomers of natural rotenone (5'alpha-epirotenone and 5'beta-epirotenone) were synthesized to identify the stereochemical factor of rotenone required for the inhibition and also to probe the structure of the rotenone binding site. The inhibitory action of the stereoisomers was compared with
Succinate-driven reverse electron transport in the respiratory chain of plant mitochondria. The effects of rotenone and adenylates in relation to malate and oxaloacetate metabolism.
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The effects of rotenone on the succinate-driven reduction of matrix nicotinamide nucleotides were investigated in Percoll-purified mitochondria from potato (Solanum tuberosum) tubers. Depending on the presence of ADP or ATP, rotenone caused an increase or a decrease in the level of reduction of the
Malate oxidation, rotenone-resistance, and alternative path activity in plant mitochondria.
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The effect of cyanide and rotenone on malate (pH 6.8), malate plus glutamate (pH 7.8), citrate, alpha-ketoglutarate, and succinate oxidation by cauliflower (Brassica oleracea L.) bud, sweet potato (Ipomoea batatis L.) tuber, and spinach (Spinacia oleracea and Kalanchoë daigremontiana leaf
Light-dependent gene expression for proteins in the respiratory chain of potato leaves.
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Expression of genes for respiratory chain dehydrogenases was investigated in potato (Solanum tuberosum L. cv. Desiree) leaves. The recently characterized nda1 and ndb1 genes, homologues to genes encoding the non-proton pumping respiratory chain NADH-dehydrogenases of Escherichia coli and yeast, were
Cold stress decreases the capacity for respiratory NADH oxidation in potato leaves.
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Cold stress effects on the expression of genes for respiratory chain enzymes were investigated in potato (Solanum tuberosum L., cv. Desiree) leaves. The nda1 and ndb1 genes, homologues to genes encoding the non-proton-pumping respiratory chain NADH dehydrogenases of Escherichia coli and yeast, were
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