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14 resultados
Characterization of the reversible taxol-induced polymerization of plant tubulin into microtubules.
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Taxol has been reported to induce the polymerization of plant tubulin into microtubules, albeit weakly when compared to that of mammalian tubulin [Morejohn, L.C., & Fosket, D.E. (1984) J. Cell Biol. 99, 141-147], suggesting that taxol, a product of plant secondary metabolism, may interact poorly
Plasma membrane-associated actin in bright yellow 2 tobacco cells. Evidence for interaction with microtubules
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Plasma membrane ghosts form when plant protoplasts attached to a substrate are lysed to leave a small patch of plasma membrane. We have identified several factors, including the use of a mildly acidic actin stabilization buffer and the inclusion of glutaraldehyde in the fixative, that allow
MAP20, a microtubule-associated protein in the secondary cell walls of hybrid aspen, is a target of the cellulose synthesis inhibitor 2,6-dichlorobenzonitrile.
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We have identified a gene, denoted PttMAP20, which is strongly up-regulated during secondary cell wall synthesis and tightly coregulated with the secondary wall-associated CESA genes in hybrid aspen (Populus tremula x tremuloides). Immunolocalization studies with affinity-purified antibodies
GTP is required for the microtubule catastrophe-inducing activity of MAP200, a tobacco homolog of XMAP215.
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Widely conserved among eukaryotes, the microtubule-associated protein 215 (MAP215) family enhances microtubule dynamic instability. The family member studied most extensively, Xenopus laevis XMAP215, has been reported to enhance both assembly and disassembly parameters, although the mechanism
Calcium Levels Affect the Ability to Immunolocalize Calmodulin to Cortical Microtubules.
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Calcium affects the stability of cortical microtubules (MTs) in lysed protoplasts. This calmodulin (CaM)-mediated interaction may provide a mechanism that serves to integrate cellular behavior with MT function. To test the hypothesis that CaM associates with these MTs, monoclonal antibodies were
Competitive Inhibition of High-Affinity Oryzalin Binding to Plant Tubulin by the Phosphoric Amide Herbicide Amiprophos-Methyl.
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Amiprophos-methyl (APM), a phosphoric amide herbicide, was previously reported to inhibit the in vitro polymerization of isolated plant tubulin (L.C. Morejohn, D.E. Fosket [1984] Science 224: 874-876), yet little other biochemical information exists concerning this compound. To characterize further
Chloroplastic metabolic engineering coupled with isoprenoid pool enhancement for committed taxanes biosynthesis in Nicotiana benthamiana.
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Production of the anticancer drug Taxol and its precursors in heterologous hosts is more sustainable than extraction from tissues of yew trees or chemical synthesis. Although attempts to engineer the Taxol pathway in microbes have made significant progress, challenges such as functional expression
Metabolic engineering of Nicotiana benthamiana for the increased production of taxadiene.
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We report the production of taxadiene by transformation of N. benthamiana with a taxadiene synthase gene. The production was significantly increased by an elicitor treatment or metabolic pathway shunting. Paclitaxel (Taxol(®)) was first isolated from the bark of the pacific yew tree as an anticancer
Disruption of microtubular cytoskeleton induced by cryptogein, an elicitor of hypersensitive response in tobacco cells.
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The dynamics of microtubular cytoskeleton were studied in tobacco (Nicotiana tabacum cv Xanthi) cells in response to two different plant defense elicitors: cryptogein, a protein secreted by Phytophthora cryptogea and oligogalacturonides (OGs), derived from the plant cell wall. In tobacco plants
Plant-specific microtubule-associated protein SPIRAL2 is required for anisotropic growth in Arabidopsis.
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In diffusely growing plant cells, cortical microtubules play an important role in regulating the direction of cell expansion. Arabidopsis (Arabidopsis thaliana) spiral2 (spr2) mutant is defective in directional cell elongation and exhibits right-handed helical growth in longitudinally expanding
Distribution of callose synthase, cellulose synthase, and sucrose synthase in tobacco pollen tube is controlled in dissimilar ways by actin filaments and microtubules.
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Callose and cellulose are fundamental components of the cell wall of pollen tubes and are probably synthesized by distinct enzymes, callose synthase and cellulose synthase, respectively. We examined the distribution of callose synthase and cellulose synthase in tobacco (Nicotiana tabacum) pollen
Affinity Purification and Characterization of Functional Tubulin from Cell Suspension Cultures of Arabidopsis and Tobacco.
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Microtubules assemble into several distinct arrays that play important roles in cell division and cell morphogenesis. To decipher the mechanisms that regulate the dynamics and organization of this versatile cytoskeletal component, it is essential to establish in vitro assays that use functional
Elucidating the mechanism of cortical microtubule reorientation in plant cells.
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Reorientation of the cortical microtubule array is an essential component of cellular development in plants. However, mechanistic details of this process are unknown. The cortical microtubule array of freshly isolated protoplasts (obtained from Nicotiana tabacum BY-2 suspension culture) is
Acetylated alpha-tubulin in the pollen tube microtubules.
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Three monoclonal alpha-tubulin antibodies YL 1/2 (Kilmartin et al., 1982), 6-11B-1 (Piperno and Fuller, 1985) and DM1A (Blose et al., 1984) were used in indirect immunofluorescence (IIF) microscopy of the microtubule (MT) cytoskeleton in tobacco (Nicotiana tabacum) pollen tubes. The majority of
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