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thiamin/arabidopsis
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Page 1 od 21 rezultati
A 5-formyltetrahydrofolate cycloligase paralog from all domains of life: comparative genomic and experimental evidence for a cryptic role in thiamin metabolism.
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A paralog (here termed COG0212) of the ATP-dependent folate salvage enzyme 5-formyltetrahydrofolate cycloligase (5-FCL) occurs in all domains of life and, although typically annotated as 5-FCL in pro- and eukaryotic genomes, is of unknown function. COG0212 is similar in overall structure to 5-FCL,
Steady-state kinetics and molecular evolution of Escherichia coli MenD [(1R,6R)-2-succinyl-6-hydroxy-2,4-cyclohexadiene-1-carboxylate synthase], an anomalous thiamin diphosphate-dependent decarboxylase-carboligase.
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(1R,6R)-2-Succinyl-6-hydroxy-2,4-cyclohexadiene-1-carboxylate (SHCHC) synthase, or MenD, catalyzes the thiamin diphosphate- (ThDP-) dependent decarboxylation of 2-oxoglutarate, the subsequent addition of the resulting succinyl-ThDP moiety to isochorismate, and the delta-elimination of pyruvate to
Carboxythiazole is a key microbial nutrient currency and critical component of thiamin biosynthesis.
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Almost all cells require thiamin, vitamin B1 (B1), which is synthesized via the coupling of thiazole and pyrimidine precursors. Here we demonstrate that 5-(2-hydroxyethyl)-4-methyl-1,3-thiazole-2-carboxylic acid (cHET) is a useful in vivo B1 precursor for representatives of ubiquitous marine
A th-1 Mutant of Arabidopsis thaliana Is Defective for a Thiamin-Phosphate-Synthesizing Enzyme: Thiamin Phosphate Pyrophosphorylase.
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We have examined the activity of the thiamin phosphate pyrophosphorylase in Arabidopsis thaliana wild type and in a mutant (th-1) which requires exogenous thiamin for growth. Mutant and wild-type plants grown in 1 x 10(-7) molar thiamin were used for the examination of the production of thiamin and
Point mutation is responsible for Arabidopsis tz-201 mutant phenotype affecting thiamin biosynthesis.
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A point mutation in the thi1 gene, involved in the synthesis of thiamin, has been identified in a tz-201 mutant line of Arabidopsis thaliana. The mutation occurs in a conserved protein domain and prevents the mutant plants from synthesizing thiamin. Complementation assays in yeast thi4 mutant
THI1, a protein involved in the biosynthesis of thiamin in Arabidopsis thaliana: structural analysis of THI1(A140V) mutant.
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In eukaryotes, there are still steps of the vitamin B1 biosynthetic pathway not completely understood. In Arabidopsis thaliana, THI1 protein has been associated with the synthesis of the thiazole ring, a finding supported by the identification of a thiamine pyrophosphate (TPP)-like compound in its
Determination of the genetic, molecular, and biochemical basis of the Arabidopsis thaliana thiamin auxotroph th1.
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2-methyl-4-amino-5-hydroxymethylpyrimidine phosphate kinase/thiamin monophosphate pyrophosphorylase (HMPPK/TMPPase) is a key enzyme involved in thiamin biosynthesis. A candidate HMPPK/TMPPase gene identified in the Arabidopsis genome complemented the thiamin auxotrophy of the th1 mutant, thus
Enhancement of Thiamin Content in Arabidopsis thaliana by Metabolic Engineering.
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Thiamin is an essential nutrient in the human diet. Severe thiamin deficiency leads to beriberi, a lethal disease which is common in developing countries. Thiamin biofortification of staple food crops is a possible strategy to alleviate thiamin deficiency-related diseases. In plants, thiamin plays a
Appropriate Thiamin Pyrophosphate Levels Are Required for Acclimation to Changes in Photoperiod.
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Thiamin pyrophosphate (TPP) is the active form of vitamin B1 and works as an essential cofactor for enzymes in key metabolic pathways, such as the tricarboxylic acid (TCA) cycle and the pentose phosphate pathway. Although its action as a coenzyme has been well documented, the roles of TPP
Orchestration of thiamin biosynthesis and central metabolism by combined action of the thiamin pyrophosphate riboswitch and the circadian clock in Arabidopsis.
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Riboswitches are natural RNA elements that posttranscriptionally regulate gene expression by binding small molecules and thereby autonomously control intracellular levels of these metabolites. Although riboswitch-based mechanisms have been examined extensively, the integration of their activity with
Thiamin confers enhanced tolerance to oxidative stress in Arabidopsis.
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Thiamin and thiamin pyrophosphate (TPP) are well known for their important roles in human nutrition and enzyme catalysis. In this work, we present new evidence for an additional role of these compounds in the protection of cells against oxidative damage. Arabidopsis (Arabidopsis thaliana) plants
Identification of mitochondrial thiamin diphosphate carriers from Arabidopsis and maize.
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It is currently held that thiamin is made in chloroplasts and converted in the cytosol to the active cofactor thiamin diphosphate (ThDP), and that mitochondria and plastids import ThDP. The organellar transporters that mediate ThDP import in plants have not been identified. Comparative genomic
Thiamin pyrophosphokinase is required for thiamin cofactor activation in Arabidopsis.
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Thiamin pyrophosphate (TPP) is an essential enzyme cofactor required for the viability of all organisms. Whether derived from exogenous sources or through de novo synthesis, thiamin must be pyrophosphorylated for cofactor activation. The enzyme thiamin pyrophosphokinase (TPK) catalyzes the
Identification of the thiamin salvage enzyme thiazole kinase in Arabidopsis and maize.
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The breakdown of thiamin (vitamin B1) and its phosphates releases a thiazole moiety, 4-methyl-5-(2-hydroxyethyl)thiazole (THZ), that microorganisms and plants are able to salvage for re-use in thiamin synthesis. The salvage process starts with the ATP-dependent phosphorylation of THZ, which in
The Arabidopsis thiamin-deficient mutant pale green1 lacks thiamin monophosphate phosphatase of the vitamin B1 biosynthesis pathway.
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Thiamin diphosphate (TPP, vitamin B1 ) is an essential coenzyme present in all organisms. Animals obtain TPP from their diets, but plants synthesize TPPde novo. We isolated and characterized an Arabidopsis pale green1 (pale1) mutant that contained higher concentrations of thiamin monophosphate (TMP)
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