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homoserine/arabidopsis
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Mechanism of control of Arabidopsis thaliana aspartate kinase-homoserine dehydrogenase by threonine.
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The regulatory domain of the bifunctional threonine-sensitive aspartate kinase homoserine dehydrogenase contains two homologous subdomains defined by a common loop-alpha helix-loop-beta strand-loop-beta strand motif. This motif is homologous with that found in the two subdomains of the biosynthetic
Homoserine lactones influence the reaction of plants to rhizobia.
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Bacterial quorum sensing molecules not only grant the communication within bacterial communities, but also influence eukaryotic hosts. N-acyl-homoserine lactones (AHLs) produced by pathogenic or beneficial bacteria were shown to induce diverse reactions in animals and plants. In plants, the reaction
Homoserine lactones: do plants really listen to bacterial talk?
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The bacterial quorum sensing signals N-acyl-L-homoserine lactones (AHL) enable bacterial cells to regulate gene expression depending on population density, which eventually leads to invasion of hosts. Only little is known about the molecular ways of plants reacting to these bacterial signals.
Transcriptional and biochemical regulation of a novel Arabidopsis thaliana bifunctional aspartate kinase-homoserine dehydrogenase gene isolated by functional complementation of a yeast hom6 mutant.
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An aspartate kinase-homoserine dehydrogenase (AK-HSDH) cDNA of Arabidopsis thaliana has been cloned by functional complementation of a Saccharomyces cerevisiae strain mutated in its homoserine dehydrogenase (HSDH) gene (hom6). Two of the three isolated clones were also able to complement a mutant
Expression of an Aspartate Kinase Homoserine Dehydrogenase Gene Is Subject to Specific Spatial and Temporal Regulation in Vegetative Tissues, Flowers, and Developing Seeds.
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Although the regulation of amino acid synthesis has been studied extensively at the biochemical level, it is still not known how genes encoding amino acid biosynthesis enzymes are regulated during plant development. In the present report, we have used the [beta]-glucuronidase (GUS) reporter gene to
Analysis of Loss-of-Function Mutants in Aspartate Kinase and Homoserine Dehydrogenase Genes Points to Complexity in the Regulation of Aspartate-Derived Amino Acid Contents.
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Biosynthesis of aspartate (Asp)-derived amino acids lysine (Lys), methionine (Met), threonine (Thr), and isoleucine involves monofunctional Asp kinases (AKs) and dual-functional Asp kinase-homoserine dehydrogenases (AK-HSDHs). Four-week-old loss-of-function Arabidopsis (Arabidopsis thaliana) mutants
A novel bifunctional aspartate kinase-homoserine dehydrogenase from the hyperthermophilic bacterium, Thermotoga maritima.
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The orientation of the three domains in the bifunctional aspartate kinase-homoserine dehydrogenase (AK-HseDH) homologue found in Thermotoga maritima totally differs from those observed in previously known AK-HseDHs; the domains line up in the order HseDH, AK, and regulatory domain. In the present
Overproduction, purification, and characterization of recombinant bifunctional threonine-sensitive aspartate kinase-homoserine dehydrogenase from Arabidopsis thaliana.
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In plant, the first and the third steps of the synthesis of methionine and threonine are catalyzed by a bifunctional enzyme, aspartate kinase-homoserine dehydrogenase (AK-HSDH). In this study, we report the first purification and characterization of a highly active threonine-sensitive AK-HSDH from
Identification of the gene encoding homoserine kinase from Arabidopsis thaliana and characterization of the recombinant enzyme derived from the gene.
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Homoserine kinase (EC 2.7.1.39) catalyzes the formation of O-phospho-l-homoserine, a branch point intermediate in the pathways for Met and Thr in plants. A genomic open reading frame located on the top arm of chromosome II and a corresponding cDNA have been identified from Arabidopsis thaliana that
A proteomic analysis of Arabidopsis thaliana seedling responses to 3-oxo-octanoyl-homoserine lactone, a bacterial quorum-sensing signal.
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N-acyl-homoserine lactones (AHLs) are a class of bacterial quorum-sensing (QS) signals that are commonly used by Gram-negative bacteria for cell-to-cell communication. Recently, it has become evident that AHLs can regulate plant root growth and trigger plant defense responses; however, little is
Methionine and threonine synthesis are limited by homoserine availability and not the activity of homoserine kinase in Arabidopsis thaliana.
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Homoserine kinase (HSK) produces O-phospho-l-homoserine (HserP) used by cystathionine gamma-synthase (CGS) for Met synthesis and threonine synthase (TS) for Thr synthesis. The effects of overexpressing Arabidopsis thaliana HSK, CGS, and Escherichia coli TS (eTS), each controlled by the 35S promoter,
Proteomic and physiological responses of Arabidopsis thaliana exposed to salinity stress and N-acyl-homoserine lactone.
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To evaluate the alleviating action of exogenous N-acyl-homoserine lactones (AHLs) on NaCl toxicity, morphological, physiological and proteomic changes were investigated in Arabidopsis thaliana seedlings. Salinity stress decreased growth parameters, increased malondialdehyde (MDA) contents and
N-acyl-L-homoserine lactones: a class of bacterial quorum-sensing signals alter post-embryonic root development in Arabidopsis thaliana.
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N-acyl-homoserine lactones (AHLs) belong to a class of bacterial quorum-sensing signals important for bacterial cell-to-cell communication. We evaluated Arabidopsis thaliana growth responses to a variety of AHLs ranging from 4 to 14 carbons in length, focusing on alterations in post-embryonic root
Identification of six novel allosteric effectors of Arabidopsis thaliana aspartate kinase-homoserine dehydrogenase isoforms. Physiological context sets the specificity.
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The Arabidopsis genome contains two genes predicted to code for bifunctional aspartate kinase-homoserine dehydrogenase enzymes (isoforms I and II). These two activities catalyze the first and the third steps toward the synthesis of the essential amino acids threonine, isoleucine, and methionine. We
Involvement of calmodulin in regulation of primary root elongation by N-3-oxo-hexanoyl homoserine lactone in Arabidopsis thaliana.
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Many bacteria use signal molecules of low molecular weight to monitor their local population density and to coordinate their collective behavior in a process called "quorum sensing" (QS). N-acyl-homoserine lactones (AHLs) are the primary QS signals among Gram-negative bacteria. AHL-mediated QS plays
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