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Arachidonic acid-related elicitors of the hypersensitive response in potato and enhancement of their activities by glucans from Phytophthora infestans (Mont.) deBary.

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The dose response for elicitation of the hypersensitive reaction in potato tuber discs by arachidonic acid (AA) suggested saturation at higher concentrations. Glucans from Phytophthora infestans, inactive themselves as elicitors of the hypersensitive reaction, enhanced sesquiterpene accumulation and

Synthesis and kinetic evaluation of 4-deoxymaltopentaose and 4-deoxymaltohexaose as inhibitors of muscle and potato alpha-glucan phosphorylases.

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alpha-Glucan phosphorylases degrade linear or branched oligosaccharides via a glycosyl transfer reaction, occurring with retention of configuration, to generate alpha-glucose-1-phosphate (G1P). We report here the chemoenzymic synthesis of two incompetent oligosaccharide substrate analogues,

Cyclic glucans produced by the intramolecular transglycosylation activity of potato D-enzyme on amylopectin.

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Potato D-enzyme catalyses an intramolecular transglycosylation reaction on amylose to produce cycloamylose, a novel cyclic alpha-1, 4 glucan. To determine if a similar activity could be observed with a high molecular weight branched substrate, recombinant potato D-enzyme was incubated with

Alpha-glucan binding of potato-tuber starch-branching enzyme I as determined by tryptophan fluorescence quenching, affinity electrophoresis and steady-state kinetics.

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The affinity of potato tuber starch-branching enzyme-I (PSBE-I) for various linear malto-oligosaccharides, cyclodextrins, (CDs) and macromolecular alpha-glucans was investigated by alpha-glucan induced fluorescence quenching of intrinsic PSBE-I tryptophan residues and by affinity electrophoresis.

Actions of Aspergillus oryzae alpha-amylase, potato phosphorylase, and rabbit muscle phosphorylase a and b on phosphorylated (1----4)-alpha-D-glucan.

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Aspergillus oryzae alpha-amylase [(1----4)-alpha-D-glucan glucanohydrolase, EC 3.2.1.1] produced O-(6-phosphoryl-alpha-D-glucopyranosyl)-(1----4)-O-alpha-D-glucopyran osy l-(1----4)-D-glucopyranose (6(3)-phosphorylmaltotriose) and

Cell wall alpha-1,3-glucans from a biocontrol isolate of Rhizoctonia: immunocytolocalization and relationship with alpha-glucanase activity from potato sprouts.

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The interface between plants and pathogens plays an important role in their interaction. Studies of fungal cell walls are scarce and previous results show the existence of alpha-1,3-glucans in addition to ss-glucans. In addition, alpha-1,3-glucans are not present in plant cell walls, and

Cumulative effect of amino acid replacements results in enhanced thermostability of potato type L alpha-glucan phosphorylase.

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The thermostability of potato type L alpha-glucan phosphorylase (EC 2.4.1.1) was enhanced by random and site-directed mutagenesis. We obtained three single-residue mutations-Phe39-->Leu (F39L), Asn135-->Ser (N135S), and Thr706-->Ile (T706I)-by random mutagenesis. Although the wild-type enzyme was

Measurement of active-site homology between potato and rabbit muscle alpha-glucan phosphorylases through use of a linear free energy relationship.

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The Michaelis-Menten parameters (Vmax and Km) for turnover of an extensive series of deoxy and deoxyfluoro derivatives of alpha-D-glucopyranosyl phosphate by the alpha-glucan phosphorylase from potato tuber have been determined. Very large rate reductions are observed as a consequence of each

Alpha-glucan phosphorylase from sweet potato: isolation and properties of the partially degraded enzyme.

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Alpha-Glucan phosphorylase (EC 2.4.1.1.) was purified from sweet potato roots. Apparently homogeneous preparations obtained are partially degraded products from phosphorylase, as judged from the results of molecular weight determination, NH-2-termini analysis and pyridoxal-5'-P assay. Phosphorylase

Photooxidation of alpha-glucan phosphorylases from rabbit muscle and potato tubers.

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Photooxidation of alpha-glucan phosphorylases from rabbit muscle and potato tubers in the presence of rose bengal leads to a rapid loss of enzymatic activity which follows first-order kinetics. The process is pH dependent, being more rapid at higher pH. The inactivation is closely related to the

Catalase and alternative oxidase cooperatively regulate programmed cell death induced by beta-glucan elicitor in potato suspension cultures.

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In potato (Solanum tuberosum L.) suspension cells, the expression of the gene encoding alternative oxidase (AOX) and H2O2 accumulation were induced by treatment with beta-glucan elicitor. The inhibition of catalase activity enhanced both AOX mRNA expression and the production of H2O2, whereas the

High expression of a synthetic gene encoding potato alpha-glucan phosphorylase in Aspergillus niger.

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We describe the successful heterologous expression of the Solanum tuberosum alpha-glucan phosphorylase (GP) gene in Aspergillus niger. Special attention was paid to the influence of different codon usage and A+T content in the coding region on GP protein expression. Use of A. niger-preferred codon

Functional domain organization of the potato alpha-glucan, water dikinase (GWD): evidence for separate site catalysis as revealed by limited proteolysis and deletion mutants.

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The potato tuber (Solanum tuberosum) GWD (alpha-glucan, water dikinase) catalyses the phosphorylation of starch by a dikinase-type reaction mechanism in which the beta-phosphate of ATP is transferred to the glucosyl residue of amylopectin. GWD shows sequence similarity to bacterial pyruvate, water

Phosphorylated alpha(1-->4)Glucans as substrate for potato starch-branching enzyme I

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The possible involvement of potato (Solanum tuberosum L.) starch-branching enzyme I (PSBE-I) in the in vivo synthesis of phosphorylated amylopectin was investigated in in vitro experiments with isolated PSBE-I using 33P-labeled phosphorylated and 3H end-labeled nonphosphorylated alpha(1-->4)glucans

Effects of glucans and eicosapentaenoic acid on differential regulation of phenylpropanoid and mevalonic pathways during potato response to Phytophthora infestans.

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The effects of Phytophthora infestans glucans, eicosapentaenoic acid (EPA) and isolates of this pathogen, on the differential expression of eight genes from the phenylpropanoid and the mevalonate (Ac-MVA) pathways were analyzed in potato by semi-quantitative RT-PCR and qRT-PCR. The application of

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