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Hydroxyproline-rich glycoproteins in plant reproductive tissues: structure, functions and regulation.

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The plant reproductive process of pollination involves a series of interactions between the male gametophyte (the pollen grain or pollen tube) and extracellular matrix (ECM) molecules secreted by different cell types along the pollen tube growth pathway in the female organ, the pistil. These

A style-specific hydroxyproline-rich glycoprotein with properties of both extensins and arabinogalactan proteins.

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A basic, hydroxyproline-rich glycoprotein (molecular mass 120 kDa) has been purified from the styles of Nicotiana alata. An antibody, specific for the protein backbone (molecular mass 78 kDa) of the glycoprotein, was used to demonstrate that the glycoprotein is a soluble, style-specific component

Isolation and characterization of hydroxyproline-rich glycopeptide signals in black nightshade leaves.

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A gene encoding a preprohydroxyproline-rich systemin, SnpreproHypSys, was identified from the leaves of black nightshade (Solanum nigrum), which is a member of a small gene family of at least three genes that have orthologs in tobacco (Nicotiana tabacum; NtpreproHypSys), tomato (Solanum

Interaction of a hydroxyproline-rich glycoprotein from tobacco callus with potential pathogens.

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A hydroxyproline-rich glycoprotein was isolated from tobacco (Nicotiana tabacum L.) callus tissue cultures by an acidic-ethanol extraction procedure and purified to about 95% homogeneity by ion exchange chromatography on carboxymethyl cellulose. This glycoprotein agglutinated cells of an avirulent

Posttranslational processing of a new class of hydroxyproline-containing proteins. Prolyl hydroxylation and C-terminal cleavage of tobacco (Nicotiana tabacum) vacuolar chitinase.

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The fungicidal class I chitinases (EC 3.2.1.14) are believed to be important in defending plants against microbial pathogens. The vacuolar isoforms of tobacco (Nicotiana tabacum), chitinases A and B, are the first examples of a new type of hydroxyproline-containing protein with intracellular

The expression of the hydroxyproline-rich glycopeptide systemin precursor A in response to (a)biotic stress and elicitors is indicative of its role in the regulation of the wound response in tobacco (Nicotiana tabacum L.).

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Two hydroxyproline-rich glycopeptide systemin (TobHS) precursor proteins known as preproTobHypSys-A and B were recently discovered in tobacco (Nicotiana tabacum L.) [Pearce et al. in Nature 411:817-820, 2001]. In this work, the effect of elicitors, insect damage, and abiotic stress on the expression

Roles of hydroxyproline-rich glycoproteins in the pollen tube and style cell growth of tobacco (Nicotiana tabacum L.).

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Hydroxyproline-rich glycoproteins (HRGPs) are plant cell wall proteins related to plant growth and development, and extensins (EXTs) are a subfamily of HRGPs. In this study, the function of HRGPs, especially EXTs, was investigated in the pollen tube and style cell growth of Nicotiana tabacum L. By

Contiguous hydroxyproline residues direct hydroxyproline arabinosylation in Nicotiana tabacum.

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Hydroxyproline (Hyp) O-glycosylation characterizes the hydroxyproline-rich glycoprotein (HRGP) superfamily of the plant extracellular matrix. Hyp glycosylation occurs in two modes: Arabinosylation adds short oligoarabinosides (Hyp-arabinosides) while galactosylation leads to the addition of larger

Structure of a hydroxyproline (Hyp)-arabinogalactan polysaccharide from repetitive Ala-Hyp expressed in transgenic Nicotiana tabacum.

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A synthetic gene encoding the fusion protein (Ala-Hyp)(51)-enhanced green fluorescent protein expressed in Nicotiana tabacum cells produced a fusion glycoprotein with all proline residues hydroxylated and substituted with an arabinogalactan polysaccharide. Alkaline hydrolysis of the fusion

Silencing the hydroxyproline-rich glycopeptide systemin precursor in two accessions of Nicotiana attenuata alters flower morphology and rates of self-pollination.

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Systemins and their hydroxyproline-rich glycopeptide systemin (ppHS) subfamily members are known to mediate antiherbivore defenses in some solanaceous taxa but not others; functions other than in defense remain largely unexplored. Nicotiana attenuata's ppHS is known not to function in herbivore

The hydroxyproline-rich glycopeptide systemin precursor NapreproHypSys does not play a central role in Nicotiana attenuata's anti-herbivore defense responses.

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To determine whether the Nicotiana tabacum preproHypSys homolog in Nicotiana attenuata (NapreproHypSys) mediates anti-herbivore responses, we silenced (IRsys) and ectopically over-expressed (OVsys) NapreproHypSys in N. attenuata. Neither herbivore simulation nor methyl jasmonate (MeJA) application

Tomato LeAGP-1 is a plasma membrane-bound, glycosylphosphatidylinositol-anchored arabinogalactan-protein.

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Arabinogalactan-proteins (AGPs) are a class of highly glycosylated, hydroxyproline-rich glycoproteins that function in plant growth and development. Tomato LeAGP-1 represents a major AGP expressed in cultured cells and plants. Based on cDNA and amino acid sequence analyses along with carbohydrate

Composition of the cell walls of Nicotiana alata Link et Otto pollen tubes.

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Cell walls isolated from pollen of Nicotiana alata germinated in vitro contain glucose and arabinose as the predominant monosaccharides. Methylation analysis and cytochemical studies are consistent with the major polysaccharides being a (1→3)-β-D-glucan (callose) and an arabinan together with small

Glycosylation motifs that direct arabinogalactan addition to arabinogalactan-proteins.

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Hydroxyproline (Hyp)-rich glycoproteins (HRGPs) participate in all aspects of plant growth and development. HRGPs are generally highly O-glycosylated through the Hyp residues, which means carbohydrates help define the interactive molecular surface and, hence, HRGP function. The Hyp contiguity

A galactose-rich, cell-wall glycoprotein from styles of Nicotiana alata.

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A basic, galactose-rich style glycoprotein (GaRSGP) encoded by a previously characterized style-specific cDNA (NaPRP4) has been isolated from the styles of Nicotiana alata and structurally characterized. The glycoprotein is associated with cell walls in the transmitting tract and is composed of

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