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Seite 1 von 96 Ergebnisse
Malate Dehydrogenase and NAD Malic Enzyme in the Oxidation of Malate by Sweet Potato Mitochondria.
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Over a range of concentrations from less than 0.1 mm to more than 70 mm, sweet potato root mitochondria display a bimodal substrate saturation isotherm for malate. The high affinity portion of the isotherm has an apparent Km for malate of 0.85 mm and fits a rectangular hyperbolic function. The low
Structure and Physicochemical Properties of Malate Starches from Corn, Potato, and Wrinkled Pea Starches.
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In this study, corn, potato, and wrinkled pea starches were esterified with malic acid under high temperatures for different lengths of time. The degree of substitution (DS), granule morphology, crystal structure, gelatinization properties, and the digestibility of the malate starch were
Isolated durum wheat and potato cell mitochondria oxidize externally added NADH mostly via the malate/oxaloacetate shuttle with a rate that depends on the carrier-mediated transport.
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We investigated whether and how mitochondria from durum wheat (Triticum durum Desf.) and potato (Solanum tuberosum), isolated from etiolated shoots and a cell suspension culture, respectively, oxidize externally added NADH via the mitochondrial shuttles; in particular, we compared the shuttles and
The control of malate dehydrogenase activity by adenine nucleotides in purified potato tuber (Solanum tuberosum L.) mitochondria.
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The limiting factors of the involvement of malate dehydrogenase in mitochondrial malate oxidation were investigated by using Percoll-purified potato tuber mitochondria. The respective roles of reduced pyridine nucleotides, oxaloacetate, and adenine nucleotides were studied under conditions of high
Decreasing the mitochondrial synthesis of malate in potato tubers does not affect plastidial starch synthesis, suggesting that the physiological regulation of ADPglucose pyrophosphorylase is context dependent.
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Modulation of the malate content of tomato (Solanum lycopersicum) fruit by altering the expression of mitochondrially localized enzymes of the tricarboxylic acid cycle resulted in enhanced transitory starch accumulation and subsequent effects on postharvest fruit physiology. In this study, we
Malate as a key carbon source of leaf dark-respired CO2 across different environmental conditions in potato plants.
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Dissimilation of carbon sources during plant respiration in support of metabolic processes results in the continuous release of CO2. The carbon isotopic composition of leaf dark-respired CO2 (i.e. δ (13) C R ) shows daily enrichments up to 14.8‰ under different environmental conditions. However, the
Integration and expression of Sorghum C(4) phosphoenolpyruvate carboxylase and chloroplastic NADP(+)-malate dehydrogenase separately or together in C(3) potato plants(1).
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We have integrated two cDNAs expressing Sorghum photosynthetic phosphoenolpyruvate carboxylase (C(4)-PEPC) and NADP-malate dehydrogenase (cpMDH), two key enzymes involved in the primary carbon fixation pathway of NADP-malic enzyme-type C(4) plants, separately or together into a C(3) plant (potato).
[Effect of L-malate on oxidation of citrate and D-isocitrate in mitochondria of potato tubercles].
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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
Dynamic proteomic profile of potato tuber during its in vitro development.
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Potato tuberization is a complicated biochemical process, which is dependent on external environmental factors. Tuber development in potato consists of a series of biochemical and morphological processes at the stolon tip. Signal transduction proteins are involved in the source-sink transition
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
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
Effect of chloral hydrate and acetaldehyde on mitochondrial preparations from sweet potato.
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The inhibitory effects of chloral hydrate and acetaldehyde have been studied on oxidations performed by mitochondrial preparations of sweet potatoes (Ipomea batatas). With a variety of substrates, chloral acts very like amytal but only between a fifth and a tenth as effectively; it affects those
Rates and roles of cyclic and alternative electron flow in potato leaves.
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Measurements of 810 nm transmittance changes in leaves, simultaneously with Chl fluorescence, CO(2) uptake and O(2) evolution, were carried out on potato (Solanum tuberosum L.) leaves with altered expression of plastidic NADP-dependent malate dehydrogenase. Electron transport rates were calculated:
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