nucleotidase/kentang

NTPDases (nucleoside triphosphate diphosphohydrolases) (also called in plants apyrases) hydrolyze nucleoside 5'-tri- and/or diphosphate bonds producing nucleosides di or monophosphate and inorganic phosphate. For years, studies have been carried out to use both plant and animal enzymes for medicine.

Higher-plant cyclic nucleotide phosphodiesterases. Resolution, partial purification and properties of three phosphodiesterases from potato tuber.

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1. Three phosphodiesterases that are capable of hydrolysing 3':5'-cyclic nucleotides were purified from potato tubers. 2. The phosphodiesterases were fractionated by (NH4)2SO4 precipitation and CM-cellulose chromatography. The phosphodiesterases were resolved from each other and further purified by

Purification and characterization of a cyclic nucleotide-regulated 5'-nucleotidase from potatoe.

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A procedure is presented for the rapid purification of a 5'-nucleotidase (5'-ribonucleotide phosphohydrolase, EC 3.1.3.5) from potato tubers, involving ammonium sulphate fractionation and chromatography on phosphocellulose, DEAE-cellulose and Sephadex G-75. Application of this procedure results in a

Stage-specific expression of P2Y receptors, ecto-apyrase, and ecto-5'-nucleotidase in myeloid leukocytes.

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The expression of P2 purinergic receptor subtypes in leukocytes varies with both lineage and developmental stage. Given the recent identification and cloning of at least seven distinct G protein-coupled ATP receptor subtypes (P2Y family), we investigated P2Y receptor subtype expression during

Comparison of the molecular species patterns of phosphatidic acid, CDP-diacylglycerols and phosphatidylinositol in potato tuber, pea leaf and soya-bean microsomes: consequences for the selectivity of the enzymes catalyzing phosphatidylinositol biosynthesis.

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Microsomes prepared from pea leaf, potato tuber or germinated soya-beans, were incubated for 30 min with [14C]glycerol 3-phosphate. In the three tissues, phosphatidic acid (PA), CDP-diacylglycerols (CMP-PA) and phosphatidylinositol (PI) were labelled and could be separated by TLC. After methylation

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

Mung bean nuclease: mode of action and specificity vs synthetic esters of 3'-nucleotides.

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Mung bean nuclease hydrolyzes synthetic esters of 3'-nucleotides to nucleosides and phosphate esters; esters of 2'-nucleotides, and 2'--> 5' internucleotide linkages, are resistant. Esters of ribonucleotides are cleaved at 100-fold the rate for deoxyribonucleotides, the increased rate being due to

Ectonucleotidases, purine nucleoside transporter, and function of the bile canalicular plasma membrane of the hepatocyte.

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Ectonucleotidases are enzymes that degrade extracellular nucleotides. Extracellular nucleotides (especially ATP) and their degradation products (particularly adenosine) have multiple effects on cell functions by acting through purinergic receptors. Adenosine nucleotides are present in bile, which

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