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pectin/tupakat

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Identification and characterization of the first pectin methylesterase gene discovered in the root lesion nematode Pratylenchus penetrans.

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Similar to other plant-parasitic nematodes, root lesion nematodes possess an array of enzymes that are involved in the degradation of the plant cell wall. Here we report the identification of a gene encoding a cell wall-degrading enzyme, pectin methylesterase PME (EC 3.1.1.11), in the root lesion

Ultraviolet radiation drives methane emissions from terrestrial plant pectins.

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Recent studies demonstrating an in situ formation of methane (CH(4)) within foliage and separate observations that soil-derived CH(4) can be released from the stems of trees have continued the debate about the role of vegetation in CH(4) emissions to the atmosphere. Here, a study of the role of

Isolation of a flax pectin methylesterase promoter and its expression in transgenic tobacco.

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Pectin methylesterases (PME) catalyze the de-esterification of methoxylated pectins in plant cell walls. We have isolated a 1.9 kb regulatory region upstream from the Lupme3 coding sequence of Linum usitatissimum L. (flax) using a 'Polymerase Chain Reaction (PCR) walking' strategy. Two 5' truncated

A novel function for a ubiquitous plant enzyme pectin methylesterase: the host-cell receptor for the tobacco mosaic virus movement protein.

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Plant virus-encoded movement proteins promote viral spread between plant cells via plasmodesmata. The movement is assumed to require a plasmodesmata targeting signal to interact with still unidentified host factors presumably located on plasmodesmata and cell walls. The present work indicates that a

Expression of fungal pectin methylesterase in transgenic tobacco leads to alteration in cell wall metabolism and a dwarf phenotype.

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A transgenic tobacco plant (Nicotiana tabacum L.) expressing a fungal pectin methylesterase (PME; EC 3.1.1.11) gene derived from a black filamentous fungus, Aspergillus niger was created. Fungal PME should have a wider range of adaptability to substrate pectin compared with plant PME. As expected,

The pectin lyase-encoding gene (pnl) family from Glomerella cingulata: characterization of pnlA and its expression in yeast.

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Oligodeoxyribonucleotide primers were designed from conserved amino acid (aa) sequences between pectin lyase D (PNLD) from Aspergillus niger and pectate lyases A and E (PELA/E) from Erwinia chrysanthemi. The polymerase chain reaction (PCR) was used with these primers to amplify genomic DNA from the
Polygalacturonate 4-[alpha]-galacturonosyltransferase (EC 2.4.1.43) activity has been identified in microsomal membranes isolated from tobacco (Nicotiana tabacum L. cv Samsun) cell-suspension cultures. Incubation of UDP-[14C]galacturonic acid with tobacco membranes results in a time-dependent
Of the two commercially cultivated coffee (Coffea) species, C. arabica (arabica) is highly susceptible and C. canephora (robusta) is highly resistant to the insect pest Xylotrechus quadripes (Coleoptera: Cerambycidae), commonly known as coffee white stem borer (CWSB). We constructed a

Role of the leader sequence in tobacco pectin methylesterase secretion.

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We report that unprocessed tobacco pectin methylesterase (PME) contains N-terminal pro-sequence including the transmembrane (TM) domain and spacer segment preceding the mature PME. The mature portion of PME was replaced by green fluorescent protein (GFP) gene and various deletion mutants of

Methanol production is enhanced by expression of an Aspergillus niger pectin methylesterase in tobacco cells.

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Tobacco suspension culture cell (Nicotiana tabacum, BY2) was transformed with an Aspergillus niger pectin methylesterase (PME; EC 3.1.1.11) cDNA under the control of cauliflower mosaic virus (CaMV) 35S promoter. The transformant indicated a significant rise of PME and the level of methanol in the

Antisense transgenesis of tobacco with a flax pectin methylesterase affects pollen ornamentation.

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Antisense transgenesis of tobacco (Nicotiana tabacum) with a partial flax (Linum usitatissimum L.) pectin methylesterase (Lupme3) cDNA sequence yielded plants with altered pollen content. Moreover, the characteristically sculptured cell wall surrounding the pollen grains was modified in transgenic

Pectin methylesterase NaPME1 contributes to the emission of methanol during insect herbivory and to the elicitation of defence responses in Nicotiana attenuata.

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Pectin methylesterases (PMEs) catalyse the demethylation of pectin within plant cell walls, releasing methanol (MeOH) in the process. Thus far, PMEs have been found to be involved in diverse processes such as plant growth and development and defence responses against pathogens. Herbivore attack

Pectin methylesterase-generated methanol may be involved in tobacco leaf growth.

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Plant leaves undergo a sink-source modification of intercellular macromolecular transport during the transition from carbon import to carbon export. After assessing the role of metabolite signaling in gene regulation in Nicotiana tabacum sink and source leaves, we observed increased pectin

Characterization and functional expression of a ubiquitously expressed tomato pectin methylesterase.

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Pectin methylesterase (PME), a ubiquitous enzyme in plants, de-esterifies the methoxylated pectin in the plant cell wall. We have characterized a PME gene (designated as pmeu1) from tomato (Lycopersicon esculentum) with an expression that is higher in younger root, leaf, and fruit tissues than in

Detection and localization of pectin methylesterase isoforms in pollen tubes of Nicotiana tabacum L.

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Pectin methylesterases (PMEs) were detected in tobacco ( Nicotiana tabacum) pollen tubes grown in vitro. Seven PME isoforms exhibiting a wide isoelectric-point (pI) range (5.3-9.1) were found in crude extracts of pollen tubes. These isoforms were mainly retrieved in supernatants after low- and
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