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Beta-Glycosidase of potato.

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Potato virus X coat protein: a glycoprotein.

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The coat protein (CP) genes of all the strains of potato virus X (PVX) code for a protein of 25 kDa. Analysis of the CP by SDS-PAGE shows a migration mobility of 27 to 29 kDa, depending of the strain. Amino acid identity between some strains is too high to explain such abnormal migration by

Electrophoretic determination of calystegines A3 and B2 in potato.

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Potatoes, members of the Solanaceae plant family, contain calystegines, water-soluble nortropane alkaloids, which are biologically active as glycosidase inhibitors. The content of calystegines A(3) and B(2) in different varieties of potato and in various parts of the tubers (whole potato, peel,

Cooperation of enzymes involved in carbohydrate digestion of Colorado potato beetle (Leptinotarsa decemlineata, Say).

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Colorado potato beetle (Leptinotarsa decemlineata, Say) is the main pest of Solanaceae and its survival is mainly dependent on the carbohydrate digestion. Characterizing the gut enzymes may help us with finding effective inhibitors for plant protection. Activity measurements revealed that gut

Production and Characteristics of Raw Starch-Digesting Glucoamylase O from a Protease-Negative, Glycosidase-Negative Aspergillus awamori var. kawachi Mutant.

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Production of a raw starch-digesting glucoamylase O (GA O) by protease-negative, glycosidase-negative mutant strain HF-15 of Aspergillus awamori var. kawachi was undertaken under submerged culture conditions. The purified GA O was electrophoretically homogeneous and similar to the parent

The N-glycosidase activity of the ribosome-inactivating protein ME1 targets single-stranded regions of nucleic acids independent of sequence or structural motifs.

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ME(1), a type I ribosome-inactivating protein (RIP), belongs to a family of enzymes long believed to possess rRNA N-glycosidase activity directed solely at the universally conserved residue A4324 in the sarcin/ricin loop of large eukaryotic and prokaryotic rRNAs. We have investigated the effect of

Enhancing monoterpene alcohols in sweet potato shochu using the diglycoside-specific β-primeverosidase.

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Monoterpene alcohols (MTAs) are characteristic flavour-imparting compounds in sweet potato shochu (Japanese distilled spirit) that are liberated following hydrolysis by specific enzymes during fermentation. In the present study, we evaluated the effect of an exogenously added diglycoside-specific

Unexpected mode of action of sweet potato β-amylase on maltooligomer substrates.

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β-Amylase (EC 3.2.1.2), one of the main protein of the sweet potato, is an exo-working enzyme catalyzing the hydrolysis of α(1,4) glycosidic linkages in polysaccharides and removes successively maltose units from the non-reducing ends. The enzyme belongs to glycoside hydrolase GH14 family and

Expression of a cDNA encoding Phytolacca insularis antiviral protein confers virus resistance on transgenic potato plants.

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To develop an antiviral agent and virus-resistant plants, a cDNA clone encoding Phytolacca insularis antiviral protein (PIP) was isolated from a cDNA library constructed with poly(A)+ RNA purified from leaves of P. insularis. The PIP cDNA contains an open reading frame encoding 307 amino acids. The

Putrescine N-methyltransferase in Solanum tuberosum L., a calystegine-forming plant.

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Putrescine N-methyltransferase (PMT, EC 2.1.1.53) catalyses the first specific step in the biosynthesis of tropane and nicotine alkaloids. Potato (Solanum tuberosum L.) contains neither nicotine nor the medicinal tropane alkaloids hyoscyamine or scopolamine, but calystegines. They are nortropane

Potato plants with genetically engineered tropane alkaloid precursors.

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UNASSIGNED Solanum tuberosum tropinone reductase I reduced tropinone in vivo. Suppression of tropinone reductase II strongly reduced calystegines in sprouts. Overexpression of putrescine N -methyltransferase did not alter calystegine accumulation. Calystegines are hydroxylated alkaloids formed by

The effects of calystegines isolated from edible fruits and vegetables on mammalian liver glycosidases.

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The polyhydroxylated nortropane alkaloids called calystegines occur in many plants of the Convolvulaceae, Solanaceae, and Moraceae families. Certain of these alkaloids exhibit potent inhibitory activities against glycosidases and the recently demonstrated occurrence of calystegines in the leaves,

Isolation methods of high glycosidase-producing mutants of Aspergillus luchuensis and its mutated genes.

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High glycosidase-producing strains of Aspergillus luchuensis were isolated from 2-deoxyglucose (2-DG) resistant mutants. α-Amylase, exo-α-1,4-glucosidase, β-glucosidase and β-xylosidase activity in the mutants was ~3, ~2, ~4 and ~2.5 times higher than the parental strain RIB2604 on

Glycoalkaloid and calystegine contents of eight potato cultivars.

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Diverse procedures have been reported for the separation and analysis by HPLC of the two major glycoalkaloids present in potatoes, alpha-chaconine and alpha-solanine. To further improve the usefulness of the HPLC method, studies were carried out on the influence of several salient parameters on the

Isolation and chemoenzymatic treatment of glycoalkaloids from green, sprouting and rotting Solanum tuberosum potatoes for solanidine recovery.

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The estimation of glycoalkaloids in the flesh of different types of decayed potatoes was evaluated. The results showed that turned green and also sprouting or rotting potato flesh contain high amounts of toxic solanine and chaconine, exceeding by 2-5-fold the recommended limit, and ranging from

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