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Purification and Properties of Mesophyll and Bundle Sheath Cell alpha-Glucan Phosphorylases from Zea mays L. : Equivalence of the Enzymes with the Cytosol and Plastid Phosphorylases from Spinach.

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Two major alpha-glucan phosphorylases (I and II) from leaves of the C(4) plant corn (Zea mays L.) were previously shown to be compartmented in mesophyll and bundle sheath cells, respectively (C Mateyka, C Schnarrenberger 1984 Plant Sci Lett 36: 119-123). The two enzymes were separated by

Transient Nature of a (1 --> 3), (1 --> 4)-beta-d-Glucan in Zea mays Coleoptile Cell Walls.

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Excised Zea mays L. embryos were cultured on Linsmaier and Skoog medium. Coleoptiles were sampled at regular intervals and the length, fresh weight, cell wall weight, and cell wall neutral sugar composition were determined. A specific beta-d-glucanase from Bacillus subtilis was used to determine the

Infection structure-specific expression of β-1,3-glucan synthase is essential for pathogenicity of Colletotrichum graminicola and evasion of β-glucan-triggered immunity in maize.

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β-1,3-Glucan and chitin are the most prominent polysaccharides of the fungal cell wall. Covalently linked, these polymers form a scaffold that determines the form and properties of vegetative and pathogenic hyphae. While the role of chitin in plant infection is well understood, the role of

Several thaumatin-like proteins bind to beta-1,3-glucans.

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Pathogenesis-related proteins from intercellular fluid washings of stressed barley (Hordeum vulgare L.) leaves were analyzed to determine their binding to various water-insoluble polysaccharides. Three proteins (19, 16, and 15 kD) bound specifically to several water-insoluble beta-1,3-glucans.

Transcriptional regulation of the genes encoding chitin and β-1,3-glucan synthases from Ustilago maydis.

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Transcriptional regulation of genes encoding chitin synthases (CHS) and β-1,3-glucan synthase (GLS) from Ustilago maydis was studied. Transcript levels were measured during the growth curve of yeast and mycelial forms, in response to ionic and osmotic stress, and during infection of maize plants.

Arrangement of mixed-linkage glucan and glucuronoarabinoxylan in the cell walls of growing maize roots.

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OBJECTIVE Plant cell enlargement is unambiguously coupled to changes in cell wall architecture, and as such various studies have examined the modification of the proportions and structures of glucuronoarabinoxylan and mixed-linkage glucan in the course of cell elongation in grasses. However, there

The maize mixed-linkage (1->3),(1->4)-beta-D-glucan polysaccharide is synthesized at the golgi membrane.

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With the exception of cellulose and callose, the cell wall polysaccharides are synthesized in Golgi membranes, packaged into vesicles, and exported to the plasma membrane where they are integrated into the microfibrillar structure. Consistent with this paradigm, several published reports have shown

Attenuation of PAMP-triggered immunity in maize requires down-regulation of the key β-1,6-glucan synthesis genes KRE5 and KRE6 in biotrophic hyphae of Colletotrichum graminicola.

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In plants, pathogen defense is initiated by recognition of pathogen-associated molecular patterns (PAMPs) via plasma membrane-localized pattern-recognition receptors (PRRs). Fungal structural cell wall polymers such as branched β-glucans are essential for infection structure rigidity and

Auxin-enhanced glucan autohydrolysis in maize coleoptile cell walls.

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Cell walls isolated from auxin-pretreated maize (Zea mays L.) coleoptile segments were assayed to disclose evidence for the existence of enhanced autolysis. To improve the sensitivity of the measurements and to facilitate kinetic analysis, isolated cell walls were consolidated within a small column,

Synthesis of (1-->3), (1-->4)-beta-D-glucan in the Golgi apparatus of maize coleoptiles.

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Membranes of the Golgi apparatus from maize (Zea mays L.) were used to synthesize in vitro the (1-->3), (1-->4)-beta-D-glucan (MG) that is unique to the cell wall of the Poaceae. The MG was about 250 kDa and was separated from a much larger (1-->3)-beta-D-glucan (callose) by gel-permeation

The mechanism of synthesis of a mixed-linkage (1-->3), (1-->4)beta-D-glucan in maize. Evidence for multiple sites of glucosyl transfer in the synthase complex

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We examined the mechanism of synthesis in vitro of (1-->3), (1-->4)beta-D-glucan (beta-glucan), a growth-specific cell wall polysaccharide found in grasses and cereals. beta-Glucan is composed primarily of cellotriosyl and cellotetraosyl units linked by single (1-->3)beta-linkages. The ratio of

Auxin controls Golgi-localized glucan synthetase activity in the maize mesocotyl.

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Decapitation or red light irradiation (R) inhibited growth and Golgi-localized glucan synthetase (GS I) activity in the mesocotyl of intact maize (Zea mays L.) seedlings. Applied auxin (indole-3-acetic acid) prevented the effects of R and of decapitation on both growth and GS I. Auxin applied

A partial characterization of an autolytically solubilized cell wall glucan.

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Incubation of purified cell wall fragments from corn (Zea mays) coleoptiles results in solubilization of some of the wall dry matter. The portion of the weight loss due to enzymatic autolysis is due mainly to solubilization of a glucan and, to a small extent, to liberation of free glucose. No other

Purification and Partial Characterization of a Glucan Containing Indole-3-acetic Acid.

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The "bound auxin" of Zea mays, first described by Berger and Avery (Amer. J. Bot. 1944; 31: 199-203) has been purified and partially characterized. It is an indole-3-acetic acid-containing, high molecular weight, lipophilic cellulosicglucan. The indole-3-acetic acid is in ester linkage as evidenced

Acid- and Enzyme-Mediated Solubilization of Cell-Wall beta-1.3,beta-1.4-d-Glucan in Maize Coleoptiles : Implications for Auxin-Mediated Growth.

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The release of soluble carbohydrates from isolated cell wall of maize (Zea mays L.) was investigated in the range of pH 1 to 8.5. The pH profile demonstrated two peaks, a broad peak at pH 6 due to enzymatic breakdown of beta-glucan to monosaccharides (wall autolysis) and a sharp peak at pH 2.5 due

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Herbal & Natural Medicine

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