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Amino Acid Transport in Suspension-Cultured Plant Cells : VI. Influence of pH Buffers, Calcium, and Preincubation Media on l-Leucine Uptake.

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The rate at which l-leucine was transported into suspension-cultured Nicotiana tabacum cv Wisconsin 38 cells increased more than 2-fold over a period of hours when the cells were preincubated in a 1% sucrose solution. This increase in uptake rate was eliminated if certain tris buffers were included

Amino Acid Transport in Suspension-Cultured Plant Cells : III. COMMON CARRIER SYSTEM FOR THE UPTAKE OF l-ARGININE, l-ASPARTIC ACID, l-HISTIDINE, l-LEUCINE, AND l-PHENYLALANINE.

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The transport of l-arginine (l-Arg), l-aspartic acid (l-Asp), l-histidine (l-His), and l-phenylalanine (l-Phe) has been investigated in suspension cultures of Nicotiana tabacum cv. Wisconsin 38 cells. Uptake of these amino acids is pH- and energy-dependent, concentrative (except for l-Asp),

Amino Acid Transport in Suspension-cultured Plant Cells: II. CHARACTERIZATION OF l-LEUCINE UPTAKE.

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l-Leucine (l-Leu) transport into suspension cultured Nicotiana tabacum L. cv. Wisconsin 38 cells has been investigated. Cells were batch-cultured and routinely assayed 3.5 to 4 days after subculturing. Uptake rates were measured over the concentration range of 10 micromolar to 150 millimolar.

Soluble overexpression in Escherichia coli, and purification and characterization of wild-type recombinant tobacco acetolactate synthase.

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Acetolactate synthase (ALS) is the first common enzyme in the biosynthesis of L-leucine, L-isoleucine, and L-valine. The wild-type ALS gene from Nicotiana tabacum was cloned into the bacterial expression vector pGEX-2T. The resulting recombinant plasmid pGEX-ALS2 was used to transform Escherichia

Water and salt stresses, kinetin and protein synthesis in tobacco leaves.

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The capacity of tobacco (Nicotiana rustica) leaf discs to incorporate l-leucine (14)C into proteins was measured. Leaf discs were obtained from plants which experienced soil water depletion, or which were exposed to a saline or osmotic stress in the root medium. The stresses were brief of relatively

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

Inhibition of plant protein synthesis by the cyanobacterial hepatotoxin, cylindrospermopsin.

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Cylindrospermopsin, a cyanobacterial guanidine alkaloid hepatotoxin and protein synthesis-inhibitor, was assayed for its effects on the germination of pollen from tobacco (Nicotiana tabacum cv Samsun NN). Pollen germination, measured by Alcian Blue dye-binding, was inhibited by cylindrospermopsin

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