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Cyclic [beta]-1,6-1,3-Glucans of Bradyrhizobium japonicum USDA 110 Elicit Isoflavonoid Production in the Soybean (Glycine max) Host.
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High levels of cyclic [beta]-1,6-1,3-glucans (e.g. 0.1 mg mg-1 of total protein) are synthesized by free-living cells as well as by bacteroids of Bradyrhizobium japonicum USDA 110 (K.J. Miller, R.S. Gore, R. Johnson, A.J. Benesi, V.N. Reinhold [1990] J Bacteriol 172: 136-142; R.S. Gore and K.J.
Partial purification and immunological characterization of 1,3-β-glucan synthase from suspension cells of Glycine max.
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The plasma-membrane-localized 1,3-β-glucan synthase (EC 2.4.1.34) from suspension cultures of Glycine max (L.) Merr. was greatly enriched by a three-step purification procedure. Starting with a microsomal preparation, a six- to eightfold enrichment of the enzyme was achieved by isolating
Cyclic [beta]-1,6 -1,3 Glucans Are Synthesized by Bradyrhizobium japonicum Bacteroids within Soybean (Glycine max) Root Nodules.
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We have previously reported that free-living cultures of Bradyrhizobium species produce novel oligosaccharides that are cyclic, contain between 10 and 13 glucose residues, and are linked by [beta]-1,6 and [beta]-1,3 glycosidic bonds (K.J. Miller, R.S. Gore, R. Johnson, A.J. Benesi, V.N. Reinhold
Isolation of a French bean (Phaseolus vulgaris L.) homolog to the beta-glucan elicitor-binding protein of soybean (Glycine max L.).
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A high-affinity membrane-bound beta-glucan elicitor-binding protein has been purified from microsomal preparations of French bean (Phaseolus vulgaris L.) roots. A 5900-fold purification was achieved by affinity chromatography of functionally solubilized membrane proteins. The beta-glucan-binding
Specific binding of a fungal glucan phytoalexin elicitor to membrane fractions from soybean Glycine max.
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Treatment of soybean tissues with elicitors results in the production of phytoalexins, one of a number of inducible plant defense reactions against microbial infections. The present study uses a beta-1,3-[(3)H]glucan elicitor fraction from Phytophthora megasperma f. sp. glycinea, a fungal pathogen
High-affinity binding of fungal beta-glucan fragments to soybean (Glycine max L.) microsomal fractions and protoplasts.
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We have recently reported the existence of binding sites in soybean membranes for a beta-glucan fraction derived from the fungal pathogen Phytophthora megasperma f. sp. glycinea, which may play a role in the elicitor-mediated phytoalexin response of this plant [Schmidt, W. E. & Ebel, J. (1987) Proc.
One-step purification of the beta-glucan elicitor-binding protein from soybean (Glycine max L.) roots and characterization of an anti-peptide antiserum.
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A low abundance beta-glucan elicitor-binding protein from soybean was isolated by a rapid, simple and one-step purification method yielding about 9000-fold enrichment. The affinity-based purification technique was more efficient than a procedure that uses conventional methods and preserved the
Structural characterization of two water-soluble polysaccharides from black soybean (Glycine max (L.) Merr.).
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Black soybeans (Glycine max (L.) Merr.) have been widely used as a health food and medicinal herb in oriental medicine. In the present study, the chemical structures of two water-soluble polysaccharides (black soybean polysaccharide 1 (BSPS-1) and black soybean polysaccharide 3 (BSPS-3)) isolated
Rapid Accumulation of Anionic Peroxidases and Phenolic Polymers in Soybean Cotyledon Tissues following Treatment with Phytophthora megasperma f. sp. Glycinea Wall Glucan.
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Phytophthora megasperma Drechs. f. sp. glycinea Kuan & Erwin (PMG) cell wall glucan has been extensively characterized as an elicitor of the pterocarpan phytoalexins, the glyceollins in soybean (Glycine max L.). Just recently, this glucan was shown to be a potent elicitor of conjugates of the
Release of highly elicitor-active glucans by germinating zoospores of Phytophthora megasperma f. sp. glycinea.
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An in-vitro culture system allowing the simultaneous germination of cysts was used to study the early host-independent release of phytoalexin elicitors by Phytophthora megasperma f. sp. glycinea, a soybean pathogen. Significant elicitor activity could be detected in the culture medium as early as 2
Further studies of the role of cyclic beta-glucans in symbiosis. An NdvC mutant of Bradyrhizobium japonicum synthesizes cyclodecakis-(1-->3)-beta-glucosyl.
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The cyclic beta-(1-->3),beta-(1-->6)-D-glucan synthesis locus of Bradyrhizobium japonicum is composed of at least two genes, ndvB and ndvC. Mutation in either gene affects glucan synthesis, as well as the ability of the bacterium to establish a successful symbiotic interaction with the legume host
Catalytic properties of the bifunctional soybean beta-glucan-binding protein, a member of family 81 glycoside hydrolases.
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The beta-glucan-binding protein (GBP) of soybean (Glycine max L.) has been shown to contain two different activities. As part of the plasma membrane-localized pathogen receptor complex, it binds a microbial cell wall elicitor, triggering the activation of defence responses. Additionally, the GBP is
Cellulose and 1,3-glucan synthesis during the early stages of wall regeneration in soybean protoplasts.
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Protoplasts isolated from cultured soybean cells (Glycine max (L.) Merr., cv. Mandarin) were used to study polysaccharide biosynthesis during the initial stages of cell wall-regeneration. Within minutes after the protoplasts were transferred to a wall-regeneration medium containing [(14)C]glucose,
Synthesis of beta-(1-->3)-Glucan from Extracellular Uridine Diphosphate Glucose as a Wound Response in Suspension-cultured Soybean Cells.
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Soybean (Glycine max) suspension-cultured cells were incubated with 600 micromolar uridine diphosphate [(14)C]glucose, and the incorporation into alkali-insoluble material was studied. When the cells were kept in suspension by shaking on a linear shaker, the incorporation was very low. The
Differential mRNA degradation of two beta-tubulin isoforms correlates with cytosolic Ca2+ changes in glucan-elicited soybean cells.
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Transgenic soybean (Glycine max) culture cells expressing apoaequorin, a Ca2+ indicator, were exposed to glucan fragments derived from Phytophthora sojae or to chitin oligomers. The effects of these elicitors on cytosolic Ca2+ concentrations and on mRNA levels of two beta-tubulin isoforms, tubB1 and
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