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Página 1 a partir de 68 resultados
Role of adenosine salvage in wound-induced adenylate biosynthesis in potato tuber slices.
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Levels of ATP and other nucleotides increased in wounded potato tuber slices, maintained on moist paper for 24 h after preparation. The relative expression intensity of genes encoding adenosine kinase (AK) and adenine phosphoribosyltransferase (APRT) in wounded slices was greater than the intensity
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
Purification and characterization of the soluble form of mitochondrial adenosine triphosphatase from sweet potato.
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The soluble form of mitochondrial adenosine triphosphatase was purified in an electrophoretically and immunologically pure form from sweet potato root tissue. The enzyme consisted of six kinds of subunits with different molecular weights (52,500, 51,500, 35,500, 26,000, 23,000, and 12,000), and its
Purification and characterization of adenosine diphosphate glucose pyrophosphorylase from maize/potato mosaics.
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Adenosine diphosphate glucose pyrophosphorylase (AGPase) catalyzes a rate-limiting step in starch biosynthesis. The reaction produces ADP-glucose and pyrophosphate from glucose-1-P and ATP. Investigations from a number of laboratories have shown that alterations in allosteric properties as well as
A cell wall-bound adenosine nucleosidase is involved in the salvage of extracellular ATP in Solanum tuberosum.
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Extracellular ATP (eATP) has recently been demonstrated to play a crucial role in plant development and growth. To investigate the fate of eATP within the apoplast, we used intact potato (Solanum tuberosum) tuber slices as an experimental system enabling access to the apoplast without interference
Contribution of adenosine 5'-diphosphoglucose pyrophosphorylase to the control of starch synthesis is decreased by water stress in growing potato tubers
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Water stress stimulates sucrose synthesis and inhibits starch and cell-wall synthesis in tissue slices of growing potato (Solanum tuberosum L. cv. Desiree) tubers. Based on the analysis of fluxes and metabolites, Geigenberger et al. (1997, Planta 201: 502-518) proposed that water deficits up to
The effect of exogenous sugars on the control of flux by adenosine 5'-diphosphoglucose pyrophosphorylase in potato tuber discs.
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The aim of this work was to investigate the effect of exogenous sugars on the extent to which starch synthesis in potato ( Solanum tuberosum L.) is controlled by adenosine 5'-diphosphoglucose pyrophosphorylase (EC 2.7.7.27; AGPase). Tuber discs were incubated in the presence of a range of
Adenosine 5'-diphosphate-glucose pyrophosphorylase from potato tuber. Significance of the N terminus of the small subunit for catalytic properties and heat stability.
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cDNAs encoding the large subunit and a possibly truncated small subunit of the potato tuber (Solanum tuberosum L.) adenosine 5'-diphosphate-glucose pyrophosphorylase have been expressed in Escherichia coli (A.A. Iglesias, G.F. Barry, C. Meyer, L. Bloksberg, P.A. Nakata, T. Greene, M.J. Laughlin,
Purple sweet potato anthocyanins attenuate hepatic lipid accumulation through activating adenosine monophosphate-activated protein kinase in human HepG2 cells and obese mice.
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Purple sweet potato is a functional food rich in anthocyanins that possess disease-preventive properties. Anthocyanins are known to possess potent antidiabetic properties. However, the effect of the anthocyanin fraction (AF) from purple sweet potato on hepatic lipid metabolism remains unclear. Our
Use of potato tuber nucleotide pyrophosphatase to synthesize adenosine 5'-monophosphate methyl ester: evidence that the solvolytic preferences of the enzyme are regulated by pH and temperature.
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Nucleotide alkyl esters are pharmacologically important as potential (ant)agonists of purinoceptors and inhibitors of enzymes. Potato nucleotide pyrophosphatase (PNP) was compared with snake venom phosphodiesterase (SVP) as a catalyst to synthesize nucleotide alkyl esters. In methanol-water
Reduction of water permeability in potato tuber slices by cyanide, ammonia, 2,4-dinitrophenol, and oligomycin and its reverse by adenosine 5'-triphosphate and cytidine 5'-triphosphate.
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Five millimolar KCN reduced water permeability in 1-millimeter thick slices of potato tuber (Solanum tuberosum L.). One-tenth millimolar ATP and CTP prevented or reversed the reduced permeability. UTP and GTP were not effective. Five millimolar ammonium carbonate or 0.1 millimolar 2,4-dinitrophenol
The contribution of adenosine 5'-diphosphoglucose pyrophosphorylase to the control of starch synthesis in potato tubers
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The aim of this work was to investigate the extent to which starch synthesis in potato (Solanum tuberosum L.) tubers is controlled by the activity of ADPglucose pyrophosphorylase (EC 2.7.7.27; AGPase). In order to do this, fluxes of carbohydrate metabolism were measured in tubers that had reduced
Inhibition of enzymic color formation in potato by adenosine triphosphate.
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Splitting of the terminal phosphate group of adenosine triphosphate by potato apyrase.
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The mechanism of hydrolysis of adenosine di- and tri-phosphate catalysed by potato apyrase.
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