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threonine/arabidopsis thaliana
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Heat-induced chaperone activity of serine/threonine protein phosphatase 5 enhances thermotolerance in Arabidopsis thaliana.
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• This study reports that Arabidopsis thaliana protein serine/threonine phosphatase 5 (AtPP5) plays a pivotal role in heat stress resistance. A high-molecular-weight (HMW) form of AtPP5 was isolated from heat-treated A. thaliana suspension cells. AtPP5 performs multiple functions, acting as a
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
Serine/threonine/tyrosine protein kinase from Arabidopsis thaliana is dependent on serine residues for its activity.
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Genome-wide analysis of Arabidopsis thaliana with tyrosine kinase motif from animals predicted that tyrosine phosphorylation could be brought about only by dual-specificity protein kinases in plants. However, their regulation is poorly understood. In the present study, we have investigated the role
Arabidopsis thaliana cDNA isolated by functional complementation shows homology to serine/threonine protein kinases.
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The yeast Saccharomyces cerevisiae ste6 mutant is defective in transport of a-mating factor, resulting in an inability of ste6 a cells to mate with alpha cells. The gene encodes an ATP-binding cassette, ABC transporter. We used functional complementation of a yeast ste6 mutant with an Arabidopsis
Novel protein kinase of Arabidopsis thaliana (APK1) that phosphorylates tyrosine, serine and threonine.
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During the course of characterizing polymerase chain reaction products corresponding to protein kinases of a higher plant, Arabidopsis thaliana, we found a DNA fragment that potentially codes for a polypeptide with mosaic sequences of two classes of protein kinases, a tyrosine-specific and a
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
A mutant of Arabidopsis thaliana (L.) Heynh. with modified control of aspartate kinase by threonine.
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Mutagenesis and subsequent selection of Arabidopsis thaliana plantlets on a growth inhibitory concentration of lysine has led to the isolation of lysine-resistant mutants. The ability to grown on 2 mM lysine has been used to isolate mutants that may contain an aspartate kinase with altered
Characterization of an Arabidopsis thaliana cDNA encoding an S-adenosylmethionine-sensitive threonine synthase. Threonine synthase from higher plants.
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An Arabidopsis thaliana cDNA encoding an S-adenosylmethionine-sensitive threonine synthase (EC 4.2.99.2) has been isolated by functional complementation of an Escherichia coli mutant devoid of threonine synthase activity. Threonine synthase from A. thaliana was shown to be synthesized with a transit
Crystal structure of threonine synthase from Arabidopsis thaliana.
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Threonine synthase (TS) is a PLP-dependent enzyme that catalyzes the last reaction in the synthesis of threonine from aspartate. In plants, the methionine pathway shares the same substrate, O-phospho-L-homoserine (OPH), and TS is activated by S-adenosyl-methionine (SAM), a downstream product of
Molecular cloning and chromosomal mapping of type one serine/threonine protein phosphatases in Arabidopsis thaliana.
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Type one serine/threonine protein phosphatases (PP1s) have been implicated in various processes of plant growth and development. In all plant species studied, PP1s are encoded by multigene families. Previous studies in our laboratory identified five Arabidopsis thaliana PP1 genes (TOPP1, TOPP2,
Role of threonines in the Arabidopsis thaliana somatic embryogenesis receptor kinase 1 activation loop in phosphorylation.
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The Arabidopsis thaliana somatic embryogenesis receptor kinase 1 (AtSERK1) gene encodes a receptor-like protein kinase that is transiently expressed during embryogenesis. To determine the intrinsic biochemical properties of the AtSERK1 protein, we have expressed the intracellular catalytic domain as
Characterization of recombinant Arabidopsis thaliana threonine synthase.
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Threonine synthase (TS) catalyses the last step in the biosynthesis of threonine, the pyridoxal 5'-phosphate dependent conversion of L-homoserine phosphate (HSerP) into L-threonine and inorganic phosphate. Recombinant Arabidopsis thaliana TS (aTS) was characterized to compare a higher plant TS with
A site-directed mutagenesis interrogation of the carboxy-terminal end of Arabidopsis thaliana threonine dehydratase/deaminase reveals a synergistic interaction between two effector-binding sites and contributes to the development of a novel selectable marker.
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We fused four mutant omr1 alleles, encoding feedback-insensitive forms of Arabidopsis thaliana biosynthetic threonine dehydratase/deaminase (TD), to the CaMV 35S promoter and transformed these constructs into A. thaliana Columbia wild type plants. The mutant TD forms consisted of our previously
A kinetic model of the branch-point between the methionine and threonine biosynthesis pathways in Arabidopsis thaliana.
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This work proposes a model of the metabolic branch-point between the methionine and threonine biosynthesis pathways in Arabidopsis thaliana which involves kinetic competition for phosphohomoserine between the allosteric enzyme threonine synthase and the two-substrate enzyme cystathionine
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,
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