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Oldal 1 tól től 133 eredmények
Molecular characterization of fatty acid alpha-hydroperoxide-forming enzyme (alpha-oxygenase) in rice plants.
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Genes encoding an alpha-oxygenase, in Nicotiana tabacum and Arabidopsis thaliana, have been recently isolated. However, the reaction mechanism of the enzyme has not so far been elucidated. In this study, a cDNA encoding the fatty acid alpha-oxygenase gene in rice plants was isolated. The deduced
Silencing ribulose-1,5-bisphosphate carboxylase/oxygenase expression does not disrupt nitrogen allocation to defense after simulated herbivory in Nicotiana attenuata.
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Ribulose-1,5-bisphosphate carboxylase/ oxygenase (RuBisCO) is the most abundant protein on the planet and in addition to its central role in photosynthesis it is thought to function as a nitrogen (N)-storage protein and a potential source of N for defense biosynthesis in plants. In a recent study in
Influence of Plant Growth at High CO2 Concentrations on Leaf Content of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase and Intracellular Distribution of Soluble Carbohydrates in Tobacco, Snapdragon, and Parsley.
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We have examined the possible role of leaf cytosolic hexoses and the expression of mannitol metabolism as mechanisms that may affect the repression of photosynthetic capacity when plants are grown at 1000 versus 380 [mu]L L-1 CO2. In plants grown at high CO2, leaf ribulose-1,5-bisphosphate
Sequence of a genomic DNA clone for the small subunit of ribulose bis-phosphate carboxylase-oxygenase from tobacco.
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We have cloned and sequenced a gene for the small subunit (SS) of ribulose bis-phosphate carboxylase-oxygenase from Nicotiana tabacum. The tobacco gene is most closely related to the SS genes from the dicots soybean and pea, and less so to the monocots wheat and Lemna; the deduced amino acid
Photoaffinity labeling of ribulose-bisphosphate carboxylase/oxygenase with 8-azidoadenosine 5'-triphosphate.
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Photoaffinity labeling with [(32)P] 8-azidoadenosine 5'-triphosphate (8-N3ATP) was used to identify putative binding sites on tobacco (Nicotiana tabacum L. and N. rustica L.) leaf ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCase, EC 4.1.1.39). Incorporation of (32)P was observed in
Binding of a Phosphorylated Inhibitor to Ribulose Bisphosphate Carboxylase/Oxygenase during the Night.
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The activity of ribulose-1,5-bisphosphate carboxylase/oxygenase was measured at various times during the purification of the enzyme from leaves of Nicotiana tabacum which were collected either 1 hour before the start of the photoperiod (predawn) or in the middle of the photoperiod (midday). The
Regulation of ribulose-1,5-bisphosphate Carboxylase/Oxygenase by carbamylation and 2-carboxyarabinitol 1-phosphate in tobacco: insights from studies of antisense plants containing reduced amounts of rubisco activase
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The regulation of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) activity by 2-carboxyarabinitol 1-phosphate (CA1P) was investigated using gas-exchange analysis of antisense tobacco (Nicotiana tabacum) plants containing reduced levels of Rubisco activase. When an increase in light flux
Regulation of cyclic electron flow in C₃ plants: differential effects of limiting photosynthesis at ribulose-1,5-bisphosphate carboxylase/oxygenase and glyceraldehyde-3-phosphate dehydrogenase.
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Cyclic electron flow around photosystem I (CEF1) is thought to augment chloroplast ATP production to meet metabolic needs. Very little is known about the induction and regulation of CEF1. We investigated the effects on CEF1 of antisense suppression of the Calvin-Benson enzymes
In Vivo Photomodification of Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase Holoenzyme by Ultraviolet-B Radiation (Formation of a 66-Kilodalton Variant of the Large Subunit).
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Increased levels of solar ultraviolet (290-320 nm) (UV-B) radiation could have profound effects on plant proteins because the aromatic amino acids in proteins absorb strongly in this spectral region. We have investigated the effects of UV-B radiation on plant proteins and have observed a novel 66-kD
Use of Transgenic Plants with Ribulose-1,5-Bisphosphate Carboxylase/Oxygenase Antisense DNA to Evaluate the Rate Limitation of Photosynthesis under Water Stress.
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The biochemical lesion that causes impaired chloroplast metabolism (and, hence, photosynthetic capacity) in plants exposed to water deficits is still a subject of controversy. In this study we used tobacco (Nicotiana tabacum L.) transformed with "antisense" ribulose-1,5-bisphosphate
Species variation in the predawn inhibition of ribulose-1,5-bisphosphate carboxylase/oxygenase.
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The activity of ribulose-1,5-bisphosphate carboxylase/oxygenase was measured in extracts of leaves collected before dawn (predawn activity, pa) and at midday (midday activity, ma). Twenty-three of the 37 species examined showed a pa/ma ratio (
Crystallization and characterization of ribulose 1,5-bisphosphate carboxylase/oxygenase from eight plant species.
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Ribulose bisphosphate carboxylase/oxygenase was isolated and crystallized from eight plant species. Crystals grew from either of two similar sets of crystallizing conditions: crystals of the enzyme from alfalfa, corn, cotton, potato, spinach, tobacco, and tomato grew from solutions containing
Ribulose-1,5-bisphosphate Carboxylase/Oxygenase and Polyphenol Oxidase in the Tobacco Mutant Su/su and Three Green Revertant Plants.
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Ribulose-1,5-bisphosphate carboxylase/oxygenase (EC 4.1.1.39) was crystallized from a heterozygous tobacco (Nicotiana tabacum L.) aurea mutant (Su/su), its wild-type sibling (su/su), and green revertant plants regenerated from green spots found on leaves of haploid Su plants. No differences were
Crystal structure of the unactivated ribulose 1,5-bisphosphate carboxylase/oxygenase complexed with a transition state analog, 2-carboxy-D-arabinitol 1,5-bisphosphate.
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The crystal structure of unactivated ribulose 1,5-bisphosphate carboxylase/oxygenase from Nicotiana tabacum complexed with a transition state analog, 2-carboxy-D-arabinitol 1,5-bisphosphate, was determined to 2.7 A resolution by X-ray crystallography. The transition state analog binds at the active
Relationship of Ribulose-1,5-bisphosphate Carboxylase-Oxygenase Specific Activity to Subunit Composition.
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Ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBPCase, EC 4.1.1.39) was isolated from Nicotiana sylvestris and from two cultivars and three nuclear substitution lines of Nicotiana tabacum. Isoelectric focusing patterns, supported by amino acid analyses and tryptic peptide mapping, were used to
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