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Mechanisms of citrate oxidation by percoll-purified mitochondria from potato tuber.
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The mechanisms and accurate control of citrate oxidation by Percoll-purified potato (Solanum tuberosum) tuber mitochondria were characterized in various metabolic conditions by recording time course evolution of the citric acid cycle related intermediates and O(2) consumption. Intact potato tuber
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
Inhibition of flower formation by antisense repression of mitochondrial citrate synthase in transgenic potato plants leads to a specific disintegration of the ovary tissues of flowers.
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The tricarboxylic acid (TCA) cycle constitutes a major component of the mitochondrial metabolism of eucaryotes, including higher plants. To analyze the importance of this pathway, we down-regulated mitochondrial citrate synthase (mCS; EC 4.1.3.7), the first enzyme of the TCA cycle, in transgenic
Mitochondrial citrate synthase from potato: predominant expression in mature leaves and young flower buds.
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A cDNA clone encoding mitochondrial citrate synthase (EC 4.1.3.7), the first enzyme of the tricarboxylic-acid cycle, was isolated from potato (Solanum tuberosum L.) and expression of the enzyme analyzed. The deduced amino-acid sequence of the potato mitochondrial citrate synthase showed high
[Effect of L-malate on oxidation of citrate and D-isocitrate in mitochondria of potato tubercles].
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PHENOTYPIC AND MOLECULAR DIFFERENTIATION OF PECTOBACTERIUM AND DICKEYA SPP. CAUSING POTATO TUBER AND STEM ROT IN NORTH-WESTERN PROVINCES OF IRAN.
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Iran is one of the most important potato-producing countries in Asia and Oceania. Approximately 20 percent of potato cultivation in Iran occurs in the North-western provinces. Pectobacterium and Dickeya species cause important diseases in potato crop. They may incite blackleg and are responsible for
Specificity of starch synthase isoforms from potato.
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In higher plants several isoforms of starch synthase contribute to the extension of glucan chains in the synthesis of starch. Different isoforms are responsible for the synthesis of essentially linear amylose chains and branched, amylopectin chains. The activity of granule-bound starch synthase I
Size effects of potato waste on its treatment by microbial fuel cell.
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The performance of microbial fuel cell (MFC) in treating potato cubes with different sizes (the edge size of 3, 5 and 7 mm) was investigated. Current density was found lower as the size of potato cubes increased, even if the differences in their removal were less apparent. At the end of MFC
[Enzyme activities and substrate levels of carbohydrate metabolism in proliferating and suberin synthesizing potato tuber cells].
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Isolation of tissue fragments from the potato tuber can initiate either periderm formation including suberin synthesis or cell proliferation without cicatrization effects. TCA-cycle activity has been shown to develop only in causal correlation with suberin synthesis (Lange, 1970). Biochemical
Effect of potato on acid-base and mineral homeostasis in rats fed a high-sodium chloride diet.
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Excessive dietary NaCl in association with a paucity of plant foods, major sources of K alkaline salts, is a common feature in Western eating habits which may lead to acid-base disorders and to Ca and Mg wasting. In this context, to evaluate the effects of potato, rich in potassium citrate, on
The polysaccharide structure of potato cell walls: Chemical fractionation.
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Cell walls of potato tubers were fractionated by successive extraction with various reagents. A slightly degraded pectic fraction with 77% galacturonic acid was extracted in hot, oxalate-citrate buffer at pH 4. A further, major pectic fraction with 38% galacturonic acid was extracted in cold 0.1 M
Inhibition of potato starch phosphorylase by alpha-D-glucopyranose-1,2-cyclic phosphate.
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alpha-D-Glucopyranose-1.2-cyclic phosphate is a potent inhibitor of potato starch phosphorylase-catalyzed (1,4-alpha-D-glucan:orthophosphate alpha-glucosyltransferase, EC 2.4.1.1) starch elongation. The inhibition is competitive with respect to alpha-D-glucopyranose 1-phosphate (Glc-1-P) with Ki
Inhibition of potato polyphenol oxidase by anions and activity in various carboxylate buffers (pH 4.8) at constant ionic strength.
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The activity of potato polyphenol oxidase (tyrosinase) toward DL-3,4-dihydroxyphenylalanine (K(M) 5.39 mM) was studied using a variety of carboxylate buffers at a common pH and ionic strength. Enzyme activity, greatest in citrate and least in oxalate, correlated with increasing carboxyl
Effect of different pH conditions on the in vitro digestibility and physicochemical properties of citric acid-treated potato starch.
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The objective of this study was to investigate the influence of citric acid (CA) treatment (10, 20, and 30% of dry starch weight) under different pH conditions (3.5, 4.5, and 5.5) on the physicochemical properties, in vitro digestibility and prebiotic effects of potato starch. With the CA content
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
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