pyridine/arabidopsis

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The relationship between pyridine nucleotides and seed dormancy.

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To investigate the proposed role for NAD metabolism in regulating seed dormancy, NAD metabolites and associated enzyme activities were analysed in seed of Arabidopsis thaliana ecotypes ranging from Col-0, which has low seed dormancy, to Cvi, which is highly dormant. Seed poly(ADP-ribosyl)ation

Aldehyde Dehydrogenases Function in the Homeostasis of Pyridine Nucleotides in Arabidopsis thaliana.

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Aldehyde dehydrogenase enzymes (ALDHs) catalyze the oxidation of aliphatic and aromatic aldehydes to their corresponding carboxylic acids using NAD+ or NADP+ as cofactors and generating NADH or NADPH. Previous studies mainly focused on the ALDH role in detoxifying toxic aldehydes but their effect on

Extracellular pyridine nucleotides as immune elicitors in arabidopsis.

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The pyridine nucleotides nicotinamide adenine dinucleotide (NAD) and NAD phosphate (NADP) are coenzymes that function in both metabolic reactions and intracellular signaling. Emerging evidence from animal research indicates that NAD(P) also acts in the extracellular space (ECS). We have shown in the

Conformational change of Arabidopsis thaliana thioredoxin reductase after binding of pyridine nucleotide and thioredoxin.

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We have found that the binding of NADP+ (Kd = 0.86+/-0.11 microM) enhanced the FAD fluorescence of Arabidopsis thaliana NADPH:thioredoxin reductase (TR, EC 1.6.4.5) by 2 times, whereas the binding of 3-aminopyridine adenine dinucleotide phosphate (AADP+) (Kd < 0.1 microM) quenched the fluorescence

Pyridine nucleotides induce changes in cytosolic pools of calcium in Arabidopsis.

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NAD is a pyridine nucleotide that is involved in cell metabolism and signaling of plant growth and stress. Recently, we reported on the multifaceted nature of NAD-inducible immunity in Arabidopsis. We identified NAD as an integral regulator of multiple defense layers such as production of ROS,

Loss-of-function of an Arabidopsis NADPH pyrophosphohydrolase, AtNUDX19, impacts on the pyridine nucleotides status and confers photooxidative stress tolerance.

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The levels and redox states of pyridine nucleotides, such as NADP(H), regulate the cellular redox homeostasis, which is crucial for photooxidative stress response in plants. However, how they are controlled is poorly understood. An Arabidopsis Nudix hydrolase, AtNUDX19, was previously identified to

Pyridine nucleotide cycling and control of intracellular redox state in relation to poly (ADP-ribose) polymerase activity and nuclear localization of glutathione during exponential growth of Arabidopsis cells in culture.

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Pyridine nucleotides, ascorbate and glutathione are major redox metabolites in plant cells, with specific roles in cellular redox homeostasis and the regulation of the cell cycle. However, the regulation of these metabolite pools during exponential growth and their precise functions in the cell

Extracellular pyridine nucleotides induce PR gene expression and disease resistance in Arabidopsis.

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Although it is well known that the pyridine nucleotides NAD and NADP function inside the cell to regulate intracellular signaling processes, recent evidence from animal studies suggests that NAD(P) also functions in the extracellular compartment (ECC). Extracellular NAD(P) [eNAD(P)] can either

Extracellular pyridine nucleotides trigger plant systemic immunity through a lectin receptor kinase/BAK1 complex.

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Systemic acquired resistance (SAR) is a long-lasting broad-spectrum plant immunity induced by mobile signals produced in the local leaves where the initial infection occurs. Although multiple structurally unrelated signals have been proposed, the mechanisms responsible for perception of these

On the mode of action of the herbicides cinmethylin and 5-benzyloxymethyl-1, 2-isoxazolines: putative inhibitors of plant tyrosine aminotransferase.

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BACKGROUND The mode of action of the grass herbicides cinmethylin and 5-benzyloxymethyl-1,2-isoxazolines substituted with methylthiophene (methiozolin) or pyridine (ISO1, ISO2) was investigated. RESULTS Physiological profiling using a series of biotests and metabolic profiling in treated duckweed

Chemical rescue of proton transfer in catalysis by carbonic anhydrases in the beta- and gamma-class.

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Catalysis of the dehydration of HCO(3)(-) by carbonic anhydrase requires proton transfer from solution to the zinc-bound hydroxide. Carbonic anhydrases in each of the alpha, beta, and gamma classes, examples of convergent evolution, appear to have a side chain extending into the active site cavity

Crystallization and preliminary X-ray analysis of the catalytic core of the alkylhydroperoxide reductase component AhpF from Escherichia coli.

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Alkylhydroperoxide reductases (AhpR, E.C. 1.6.4.x) are essential for the oxygen tolerance of aerobic organisms, converting otherwise toxic hydroperoxides of lipids or nucleic acids to their corresponding alcohols. The AhpF component (521 amino-acid residues, 56.2 kDa) belongs to the family of

Characterization of l-aspartate oxidase from Arabidopsis thaliana.

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The flavoprotein l-aspartate oxidase (LASPO) is the first enzyme of the de novo biosynthetic pathway of NAD+ in plants. Although LASPO is considered pivotal to maintain NAD+ homeostasis, it has not been hitherto characterized in plants. Here, the cDNA encoding the LASPO from the model plant

In comparison with nitrate nutrition, ammonium nutrition increases growth of the frostbite1 Arabidopsis mutant.

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Ammonium nutrition inhibits the growth of many plant species, including Arabidopsis thaliana. The toxicity of ammonium is associated with changes in the cellular redox state. The cellular oxidant/antioxidant balance is controlled by mitochondrial electron transport chain. In this study, we analysed

Characterization of a second Arabidopsis thaliana prolyl 4-hydroxylase with distinct substrate specificity.

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4-Hydroxyproline is found in collagens, collagen-like proteins, elastin, and the hypoxia-inducible transcription factor in animals and in many hydroxyproline-rich glycoproteins in plants. We report here on the cloning and characterization of a second plant P4H (prolyl 4-hydroxylase), At-P4H-2, from

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