l lysine/tubakas

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Identification of essential active-site residues in ornithine decarboxylase of Nicotiana glutinosa decarboxylating both L-ornithine and L-lysine.

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The cDNA encoding ornithine decarboxylase (ODC; EC 4.1.1.17), a key enzyme in putrescine and polyamine biosynthesis, has been cloned from Nicotiana glutinosa (GenBank AF 323910), and was expressed in Escherichia coli. The amino acid sequence of N. glutinosa ODC showed 90% identity with Datura

Immobilization of cells of Nicotiana tabacum L. on polyphenyleneoxide coated with poly-L-lysine.

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Cells of Nicotiana tabacum L. cv. Wisconsin 38 were immobilized on poly (2,6-dimethyl)-p-phenyleneoxide in powder form (Sorfix) coated with poly-L-lysine (molecular weight 40 000 daltons). The dependence of cell immobilization on the amount of bound polyL-lysine was estimated.

Changes in Membrane Potential as a Demonstration of Selective Pore Formation in the Plasmalemma by Poly-l-Lysine Treatment.

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A technique which allows determination of solute pool concentrations in the cytosol was developed exploiting the interaction between a polycation and the anionic sites of the plasmalemma. It was shown that treatment of Nicotiana tabacum, cv Xanthi, cells in suspension culture with an appropriate

Effects of ε-poly-l-lysine on vegetative growth, pathogenicity and gene expression of Alternaria alternata infecting Nicotiana tabacum.

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Microbial secondary metabolites produced by Streptomyces are applied to control plant diseases. ε-poly-l-lysine (ε-PL) is a non-toxic food preservative, but the potential application of ε-PL as a microbial fungicide in agriculture has rarely been reported. In this study, Alternaria alternata (A.

Stabilization of cortical microtubules by the cell wall in cultured tobacco cells : Effects of extensin on the cold-stability of cortical microtubules.

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Cortical microtubules (MTs) in protoplasts prepared from tobacco (Nicotiana tabacum L.) BY-2 cells were found to be sensitive to cold. However, as the protoplasts regenerated cell walls they became resistant to cold, indicating that the cell wall stabilizes cortical MTs against the effects of cold.

Phenolics production by encapsulated Nicotiana tabacum cells.

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Plant cells of tobacco (Nicotiana tabacum L.) were grown for several generations in suspension cultures. Cells were immobilized in continuous bioreactors in calcium alginate (Ca Alg) beads or in poly-L-lysine (PLL) encapsulated calcium alginatehydrogels. In each case, the cells were fed continuously

Reducing agents interfere with the detection of lettuce necrotic yellows virus in infected plants by immunoblotting with monoclonal antibodies.

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A procedure is described for the detection of lettuce necrotic yellows virus (LNYV) nucleocapsid protein (N) or envelope glycoprotein (G) by immuno-blotting with their respective monoclonal antibodies. The antigens can be detected in 1-10 mg of fresh tissue from systemically infected Nicotiana

Quantitative analysis of the fate of exogenous DNA in Nicotiana protoplasts.

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After a 5-hour incubation of protoplasts of Nicotiana tabacum L. ;Xanthi' with (3)H-DNA (7.26 mug/ml) from N. tabacum L. ;Xanthi nc' 3.5% of the initial radioactivity was found in acid-insoluble substances of the protoplasts. The addition of DEAE-dextran and poly-l-lysine to the incubation medium

Structure of dihydrodipicolinate synthase of Nicotiana sylvestris reveals novel quaternary structure.

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DHDPS is the first enzyme unique to the lysine biosynthetic pathway in plants and bacteria and catalyses the formation of (4S)-4-hydroxy-2,3,4,5-tetrahydro-(2S)-dipicolinic acid. It is feedback-regulated in plants by L-lysine. The crystal structure of Nicotiana sylvestris DHDPS with and without

Regulation of sulfate uptake by amino acids in cultured tobacco cells.

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The sulfur requirements of tobacco (Nicotiana tabacum L. var. Xanthi) XD cells grown in chemically defined liquid media can be satisfied by sulfate, thiosulfate, l-cyst(e)ine, l-methionine or glutathione, and somewhat less effectively by d-cyst (e) ine, d-methionine or dl-homocyst (e)ine. Sulfate

Lysine decarboxylase catalyzes the first step of quinolizidine alkaloid biosynthesis and coevolved with alkaloid production in leguminosae.

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Lysine decarboxylase (LDC) catalyzes the first-step in the biosynthetic pathway of quinolizidine alkaloids (QAs), which form a distinct, large family of plant alkaloids. A cDNA of lysine/ornithine decarboxylase (L/ODC) was isolated by differential transcript screening in QA-producing and

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