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molybdenum/duhan
Veza se sprema u međuspremnik
15 rezultati
Ntdin, a tobacco senescence-associated gene, is involved in molybdenum cofactor biosynthesis.
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To date, dozens of genes have been reported to be up-regulated with senescence in higher plants. Radish din1 and its ortholog sen1 of Arabidopsis are known as such, but their function is not clear yet. Here we have isolated their counterpart cDNA from tobacco and designated it as NTDIN: Its product,
Cloning and functional validation of molybdenum cofactor sulfurase gene from Ammopiptanthus nanus.
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CONCLUSIONS
The molybdenum cofactor sulfurase gene ( AnMCSU ) was cloned from xerophytic desert plant Ammopiptanthus nanus and validated for its function of tolerance toward abiotic stresses by heterologous expression in Arabidopsis thaliana. Molybdenum cofactor sulfurase participates in catalyzing
Repair in vitro of nitrate reductase-deficient tobacco mutants (cnxA) by molybdate and by molybdenum cofactor.
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Two nitrate reductase-deficient mutant cell lines (CnxA68/2, CnxA101) of Nicotiana tabacum are shown to be repairable under in-vitro conditions by (i) molybdate or (ii) by preparations of active molybdenum cofactor of homologous or heterologous origin, thereby yielding about 20% and 80%,
Identification by mutational analysis of four critical residues in the molybdenum cofactor domain of eukaryotic nitrate reductase.
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The nucleotide sequence of the nitrate reductase (NR) molybdenum cofactor (MoCo) domain was determined in four Nicotiana plumbaginifolia mutants affected in the NR apoenzyme gene. In each case, missense mutations were found in the MoCo domain which affected amino acids that were conserved not only
Medicago truncatula Molybdate Transporter type 1 (MtMOT1.3) is a plasma membrane molybdenum transporter required for nitrogenase activity in root nodules under molybdenum deficiency.
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Molybdenum, as a component of the iron-molybdenum cofactor of nitrogenase, is essential for symbiotic nitrogen fixation. This nutrient has to be provided by the host plant through molybdate transporters. Members of the molybdate transporter family Molybdate Transporter type 1 (MOT1) were identified
The molybdenum cofactor biosynthetic protein Cnx1 complements molybdate-repairable mutants, transfers molybdenum to the metal binding pterin, and is associated with the cytoskeleton.
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Molybdenum (Mo) plays an essential role in the active site of all eukaryotic Mo-containing enzymes. In plants, Mo enzymes are important for nitrate assimilation, phytohormone synthesis, and purine catabolism. Mo is bound to a unique metal binding pterin (molybdopterin [MPT]), thereby forming the
Tungstate, a molybdate analog inactivating nitrate reductase, deregulates the expression of the nitrate reductase structural gene.
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Nitrate reductase (NR, EC 1.6.6.1) from higher plants is a homodimeric enzyme carrying a molybdenum cofactor at the catalytic site. Tungsten can be substituted for molybdenum in the cofactor structure, resulting in an inactive enzyme. When nitratefed Nicotiana tabacum plants were grown on a nutrient
Reconstitution of plant nitrate reductase by Escherichia coli extracts and the molecular cloning of the chlA gene of Escherichia coli K12.
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Extracts from Escherichia coli, wild type and chlB, chlC, chlD, chlE, and chlG, but not chlA mutants, were able to reconstitute the nitrate reductase activity in Nicotiana tabacum cnx68 and Hyoscyamus muticus MA-2 mutant extracts. Because cnx68 and MA-2 lack the molybdenum cofactor required for
Characteristics of Nicotiana tabacum nitrate reductase protein produced in Saccharomyces cerevisiae.
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Tobacco nitrate reductase (NR) produced in yeast retains cytochrome c reductase activity, but not NR activity. Biochemical data suggest that the haem and FAD domains are functional, and that the molybdenum cofactor (MoCo) domain is inactive owing to the absence of MoCo in yeast. The native form of
Molecular cloning and characterisation of the two homologous genes coding for nitrate reductase in tobacco.
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The two structural genes encoding tobacco nitrate reductases (NR) were isolated from tobacco genomic libraries constructed in lambda EMBL phages. Two independent genomic clones of 12.6 and 13.5 kbp, respectively, cross-hybridizing with a partial tobacco NR cDNA probe, were further characterized.
Arabidopsis LOS5/ABA3 overexpression in transgenic tobacco (Nicotiana tabacum cv. Xanthi-nc) results in enhanced drought tolerance.
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Drought is a major environmental stress factor that affects growth and development of plants. Abscisic acid (ABA), osmotically active compounds, and synthesis of specific proteins, such as proteins that scavenge oxygen radicals, are crucial for plants to adapt to water deficit. LOS5/ABA3 (LOS5)
Isolation and characterization of Nicotiana plumbaginifolia nitrate reductase-deficient mutants: genetic and biochemical analysis of the NIA complementation group.
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Two hundred and eleven nitrate reductase-deficient mutants (NR-) were isolated from mutagenized Nicotiana plumbaginifolia protoplast cultures by chlorate selection and regenerated into plant. More than 40% of these clones were classified as cnx and presumed to be affected in the biosynthesis of the
Nitrate Reductase mRNA Regulation in Nicotiana plumbaginifolia Nitrate Reductase-Deficient Mutants.
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Light and substrate regulation of nitrate reductase (NR) expression were compared in wild type and mutant lines of Nicotiana plumbaginifolia. Mutants affected in the NR structural gene (nia) or in the biosynthesis of the NR molybdenum cofactor (cnx) were examined. nia mutants expressing a defective
Quantitative analysis of dynamic protein-protein interactions in planta by a floated-leaf luciferase complementation imaging (FLuCI) assay using binary Gateway vectors.
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Dynamic protein-protein interactions are essential in all cellular and developmental processes. Protein-fragment complementation assays allow such protein-protein interactions to be investigated in vivo. In contrast to other protein-fragment complementation assays, the split-luciferase (split-LUC)
T-DNA-insert-independent mutations induced in transformed plant cells during Agrobacterium co-cultivation.
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Transformation frequencies were determined for 1n, 2n, and 4n Nicotiana plumbaginifolia protoplast cultures in Agrobacterium-mediated gene transfer experiments. An unexpected large drop (50%) in plating efficiencies was observed in the non-selected (control) 1n populations after transformation
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