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thiamine/arabidopsis
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Dual role for the yeast THI4 gene in thiamine biosynthesis and DNA damage tolerance.
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The THI4 gene of Saccharomyces cerevisiae encodes an enzyme of the thiamine biosynthetic pathway. The plant homolog thi1, from Arabidopsis thaliana, is also involved in thiamine biosynthesis; but was originally cloned due to its capacity to complement DNA repair deficient phenotypes in Escherichia
Thiamine triphosphate and thiamine triphosphatase activities: from bacteria to mammals.
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In most organisms, the main form of thiamine is the coenzyme thiamine diphosphate. Thiamine triphosphate (ThTP) is also found in low amounts in most vertebrate tissues and can phosphorylate certain proteins. Here we show that ThTP exists not only in vertebrates but is present in bacteria, fungi,
Thiamine triphosphatase and the CYTH superfamily of proteins.
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The CYTH superfamily of proteins was named after its two founding members, the CyaB adenylyl cyclase from Aeromonas hydrophila, and the human 25-kDa thiamine triphosphatase (ThTPase). Members of this superfamily of proteins exist in all organisms, including bacteria, archaeons, fungi, plants, and
Thiamine pyrophosphate riboswitch in some representative plant species: a bioinformatics study.
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Metabolites regulate their own production by directly interacting with highly conserved regions of mRNA that are capable of forming discrete tertiary structures. Such regions of mRNA are called riboswitches. The thiamine pyrophosphate (TPP) riboswitch is the most common riboswitch in different
The first comprehensive LC-MS/MS method allowing dissection of the thiamine pathway in plants.
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Arabidopsis thaliana serves as a model plant for genetic research, including vitamin research. When aiming at engineering the thiamine (vitamin B1) pathway in plants, availability of tools that allow the quantitative determination of different intermediates in the biosynthesis pathway is of
Gene locus specificity of the glucose effect in the thiamine pathway of the angiosperm, Arabidopsis.
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All mutants at 3 loci in Arabidopsis thaliana (L.) Heynh., a higher plant, that are associated with the synthesis or coupling of the thiazole moiety of thiamine are susceptible to reversible glucose inhibition. In contrast, several different alleles involved in the synthesis of the pyrimidine moiety
Overexpression of plastid transketolase in tobacco results in a thiamine auxotrophic phenotype.
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To investigate the effect of increased plastid transketolase on photosynthetic capacity and growth, tobacco (Nicotiana tabacum) plants with increased levels of transketolase protein were produced. This was achieved using a cassette composed of a full-length Arabidopsis thaliana transketolase cDNA
Long-Distance Transport of Thiamine (Vitamin B1) Is Concomitant with That of Polyamines.
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Thiamine (vitamin B1) is ubiquitous and essential for cell energy supply in all organisms as a vital metabolic cofactor, known for over a century. In plants, it is established that biosynthesis de novo is taking place predominantly in green tissues and is furthermore limited to plastids. Therefore,
AtTHIC, a gene involved in thiamine biosynthesis in Arabidopsis thaliana.
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Thiamine (vitamin B(1)) is an essential compound for organisms. It contains a pyrimidine ring structure and a thiazole ring structure. These two moieties of thiamine are synthesized independently and then coupled together. Here we report the molecular characterization of AtTHIC, which is involved in
Modulation of cellular redox status by thiamine-activated NADPH oxidase confers Arabidopsis resistance to Sclerotinia sclerotiorum.
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Sclerotinia sclerotiorum can initially suppress host oxidative burst to aid infection establishment, but later promotes reactive oxygen species (ROS) generation as proliferation advances. Here, it was shown that the cellular redox status can be modulated by thiamine to protect Arabidopsis thaliana
Thi1, a thiamine biosynthetic gene in Arabidopsis thaliana, complements bacterial defects in DNA repair.
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An Arabidopsis thaliana cDNA was isolated by complementation of the Escherichia coli mutant strain BW535 (xth, nfo, nth), which is defective in DNA base excision repair pathways. This cDNA partially complements the methyl methane sulfonate (MMS) sensitive phenotype of BW535. It also partially
THI1, a Thiamine Thiazole Synthase, Interacts with Ca2+-Dependent Protein Kinase CPK33 and Modulates the S-Type Anion Channels and Stomatal Closure in Arabidopsis.
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Thiamine is required for both plant growth and development. Here, the involvement of a thiamine thiazole synthase, THI1, has been demonstrated in both guard cell abscisic acid (ABA) signaling and the drought response in Arabidopsis (Arabidopsis thaliana). THI1 overexpressors proved to be more
The upregulation of thiamine (vitamin B1) biosynthesis in Arabidopsis thaliana seedlings under salt and osmotic stress conditions is mediated by abscisic acid at the early stages of this stress response.
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BACKGROUND
Recent reports suggest that vitamin B1 (thiamine) participates in the processes underlying plant adaptations to certain types of abiotic and biotic stress, mainly oxidative stress. Most of the genes coding for enzymes involved in thiamine biosynthesis in Arabidopsis thaliana have been
Structure of the eukaryotic thiamine pyrophosphate riboswitch with its regulatory ligand.
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Riboswitches are untranslated regions of messenger RNA, which adopt alternate structures depending on the binding of specific metabolites. Such conformational switching regulates the expression of proteins involved in the biosynthesis of riboswitch substrates. Here, we present the 2.9
Structural basis of thiamine pyrophosphate analogues binding to the eukaryotic riboswitch.
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The thiamine pyrophosphate (TPP)-sensing riboswitch is the only riboswitch found in eukaryotes. In plants, TPP regulates its own production by binding to the 3' untranslated region of the mRNA encoding ThiC, a critical enzyme in thiamine biosynthesis, which promotes the formation of an unstable
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