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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 7 of 7 (0.042 seconds)| 1 |
The Role of 3-deoxy-D-arabino-heptulosonate 7-phosphate Synthase 1 in Arabidopsis thaliana MetabolismPoulin, Jimmy 25 August 2011 (has links)
The enzyme 3-deoxy-D-arabino-heptulusonate 7-phosphate synthase (DHS) catalyzes the first step of the shikimate pathway. In bacteria, the regulation of the pathway is mediated by allosteric inhibition of DHS by the aromatic amino acids tyrosine, phenylalanine and tryptophan. The regulation of the pathway in plants remains elusive but the aromatic amino acids are involved as suggested by the hypersensitivity of dhs1 knockout mutant to tyrosine. In this study the effects of the dhs1 mutation on endogenous levels of aromatic amino acids and of downstream metabolites are explored. HPLC analysis is used to measure levels of tyrosine and phenylalanine and 5-methyltryptophan sensitivity is used to probe levels of tryptophan. Additionally, the auxin content of whole seedlings was quantified by LC/MS and its local levels at the root apex are visualized with the DR5::GUS reporter system.
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The Role of 3-deoxy-D-arabino-heptulosonate 7-phosphate Synthase 1 in Arabidopsis thaliana MetabolismPoulin, Jimmy 25 August 2011 (has links)
The enzyme 3-deoxy-D-arabino-heptulusonate 7-phosphate synthase (DHS) catalyzes the first step of the shikimate pathway. In bacteria, the regulation of the pathway is mediated by allosteric inhibition of DHS by the aromatic amino acids tyrosine, phenylalanine and tryptophan. The regulation of the pathway in plants remains elusive but the aromatic amino acids are involved as suggested by the hypersensitivity of dhs1 knockout mutant to tyrosine. In this study the effects of the dhs1 mutation on endogenous levels of aromatic amino acids and of downstream metabolites are explored. HPLC analysis is used to measure levels of tyrosine and phenylalanine and 5-methyltryptophan sensitivity is used to probe levels of tryptophan. Additionally, the auxin content of whole seedlings was quantified by LC/MS and its local levels at the root apex are visualized with the DR5::GUS reporter system.
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Synthesis of potential inhibitors of early stages in the Shikimate PathwayProbert, Mark Andrew January 1993 (has links)
No description available.
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The tyrosine regulated DAHP synthase and the biosynthetic pathway of aromatic amino acids in Saccharomyces cerevisiae / Die Tyrosin regulierte DAHP Synthase und der Biosyntheseweg der aromatischen Aminosäuren in Saccharomyces cerevisiaeGrzeganek, Andrea 02 November 2005 (has links)
No description available.
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Examining the Regulation of 3-Deoxy-D-arabino-heptulosonate 7-phosphate Synthase in the Arabidopsis thaliana shikimate PathwayJohnson, Daniel 09 January 2014 (has links)
3-Deoxy-D-arabino-heptulosonate 7-phosphate (DAHP) synthase (DHS) catalyzes the first step of the shikimate pathway - a pathway involved in Tyrosine (Tyr), Tryptophan (Trp) and Phenylalanine (Phe) biosynthesis - by condensation of phosphoenolpyruvate and erythrose-4-phosphate to DAHP. Our lab previously demonstrated that Arabidopsis thaliana shikimate pathway flux is regulated by Tyr and Trp.
This project suggests that A. thaliana DHS1 overexpressor lines have increased Trp accumulation with Tyr treatment, and that an A. thaliana DHS2 overexpressor line treated with Tyr has unchanged Trp accumulation, indicating that AtDHS2 is Tyr-sensitive. Confocal microscopy of all 3 AtDHS isoforms fused to yellow fluorescent protein demonstrates chloroplast localization. Bimolecular fluorescence complementation indicates that protein-protein interactions occur in the cytoplasm, and not in the chloroplast, for AtDHS1 and AtDHS2 with the metabolic regulator At14-3-3ω. These findings suggest that protein-protein interactions could regulate accumulation of AtDHS2 in the chloroplast, and are perhaps modulated by Tyr.
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Examining the Regulation of 3-Deoxy-D-arabino-heptulosonate 7-phosphate Synthase in the Arabidopsis thaliana shikimate PathwayJohnson, Daniel 09 January 2014 (has links)
3-Deoxy-D-arabino-heptulosonate 7-phosphate (DAHP) synthase (DHS) catalyzes the first step of the shikimate pathway - a pathway involved in Tyrosine (Tyr), Tryptophan (Trp) and Phenylalanine (Phe) biosynthesis - by condensation of phosphoenolpyruvate and erythrose-4-phosphate to DAHP. Our lab previously demonstrated that Arabidopsis thaliana shikimate pathway flux is regulated by Tyr and Trp.
This project suggests that A. thaliana DHS1 overexpressor lines have increased Trp accumulation with Tyr treatment, and that an A. thaliana DHS2 overexpressor line treated with Tyr has unchanged Trp accumulation, indicating that AtDHS2 is Tyr-sensitive. Confocal microscopy of all 3 AtDHS isoforms fused to yellow fluorescent protein demonstrates chloroplast localization. Bimolecular fluorescence complementation indicates that protein-protein interactions occur in the cytoplasm, and not in the chloroplast, for AtDHS1 and AtDHS2 with the metabolic regulator At14-3-3ω. These findings suggest that protein-protein interactions could regulate accumulation of AtDHS2 in the chloroplast, and are perhaps modulated by Tyr.
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Transcriptional Regulation and Differentiation in Saccharomyces and Aspergillus: jlbA, RPS26, and ARO3/4 / Transkriptionelle Regulation und Differzierung in Saccharomyces und Aspergillus: jlbA, RPS26, and ARO3/4Strittmatter, Axel 06 May 2003 (has links)
No description available.
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