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Side 1 fra 97 resultater
Crystal structure of Arabidopsis thaliana Dawdle forkhead-associated domain reveals a conserved phospho-threonine recognition cleft for dicer-like 1 binding.
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Dawdle (DDL) is a microRNA processing protein essential for the development of Arabidopsis. DDL contains a putative nuclear localization signal at its amino-terminus and forkhead-associated (FHA) domain at the carboxyl-terminus. Here, we report the crystal structure of the FHA domain of Arabidopsis
Isolation and characterization of the threonine deaminase promoter in Nicotiana attenuata.
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The enzyme encoded by the threonine deaminase (TD) gene catalyzes the conversion of threonine to α-keto butyrate in the biosynthesis of isoleucine (Ile). In Nicotiana attenuata, TD transcripts accumulate constitutively in cotyledons and flowers and are elicited in leaves by wounding, herbivore
The level of threonine in tobacco seeds is limited by substrate availability, while the level of methionine is limited also by the activity of cystathionine γ-synthase.
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Methionine and threonine are two essential amino acids whose low levels limit the nutritional quality of seeds. The current objective was to define factors that regulate and might increase their levels in seeds. Feeding experiments carried out on receptacles of developing tobacco (Nicotiana tabacum)
Threonine Overproduction in Transgenic Tobacco Plants Expressing a Mutant Desensitized Aspartate Kinase of Escherichia coli.
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In higher plants, the synthesis of the essential amino acid threonine is regulated primarily by the sensitivity of the first enzyme in its biosynthetic pathway, aspartate kinase, to feedback inhibition by threonine and lysine. We aimed to study the potential of increasing threonine accumulation in
Serine/threonine protein phosphatase is required for tobacco mosaic virus-mediated programmed cell death.
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A major gap in our understanding of host response to virus infection is how the molecular signals are passed within infected cells. Tobacco mosaic virus-mediated programmed cell death in genotype NN tobaccos was used to evaluate the hypothesis that these molecular signals are transduced via
Complementation of a threonine dehydratase-deficient Nicotiana plumbaginifolia mutant after Agrobacterium tumefaciens-mediated transfer of the Saccharomyces cerevisiae ILV1 gene.
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The Saccharomyces cerevisiae ILV1 gene, encoding threonine dehydratase (EC 4.2.1.16) was fused to the transferred DNA nopaline synthase promoter and the 3' noncoding region of the octopine synthase gene. It was introduced, by Agrobacterium tumefaciens-mediated gene transfer, into an
Tobacco serine/threonine protein kinase gene NrSTK enhances black shank resistance.
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A serine/threonine protein kinase gene (NrSTK) was cloned from Nicotiana repanda based on the sequence of a previously isolated resistance gene analog (RGA). Expression of RGA was induced by challenge with the pathogen black shank. The NrSTK gene was predicted to encode a protein kinase that
Silencing threonine deaminase and JAR4 in Nicotiana attenuata impairs jasmonic acid-isoleucine-mediated defenses against Manduca sexta.
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Threonine deaminase (TD) catalyzes the conversion of Thr to alpha-keto butyrate in Ile biosynthesis; however, its dramatic upregulation in leaves after herbivore attack suggests a role in defense. In Nicotiana attenuata, strongly silenced TD transgenic plants were stunted, whereas mildly silenced TD
Dysfunctionality of a tobacco mosaic virus movement protein mutant mimicking threonine 104 phosphorylation.
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Replication of tobacco mosaic virus (TMV) is connected with endoplasmic reticulum (ER)-associated membranes at early stages of infection. This study reports that TMV movement protein (MP)-specific protein kinases (PKs) associated with the ER of tobacco were capable of phosphorylating Thr(104) in TMV
Multiple genes encoding serine/threonine protein phosphatases and their differential expression in Nicotiana tabacum.
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Five cDNA clones encoding the catalytic subunits of Ser/Thr protein phosphatases (PP) of Nicotiana tabacum were described. Among them, three clones (NPP1, NPP2, and NPP3) encoded type 1 PP (PP1), whereas the rest of the clones (NPP4 and NPP5) encoded type 2A PP (PP2A). These cDNA clones exhibited
Evidence for serine/threonine and histidine kinase activity in the tobacco ethylene receptor protein NTHK2.
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Ethylene plays important roles in plant growth, development, and stress responses. Two ethylene receptors, ETR1 from Arabidopsis and NTHK1 from tobacco (Nicotiana tabacum), have been found to have His kinase (HK) activity and Ser/Thr kinase activity, respectively, although both show similarity to
Two widely expressed plasma membrane H(+)-ATPase isoforms of Nicotiana tabacum are differentially regulated by phosphorylation of their penultimate threonine.
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The plasma membrane H(+)-ATPases PMA2 and PMA4 are the most widely expressed in Nicotiana plumbaginifolia, and belong to two different subfamilies. Both are activated by phosphorylation of a Thr at the penultimate position and the subsequent binding of 14-3-3 proteins. Their expression in
Glycosylation motifs that direct arabinogalactan addition to arabinogalactan-proteins.
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Hydroxyproline (Hyp)-rich glycoproteins (HRGPs) participate in all aspects of plant growth and development. HRGPs are generally highly O-glycosylated through the Hyp residues, which means carbohydrates help define the interactive molecular surface and, hence, HRGP function. The Hyp contiguity
Point mutations in helper component protease of clover yellow vein virus are associated with the attenuation of RNA-silencing suppression activity and symptom expression in broad bean.
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Helper component protease (HC-Pro) is a potyvirus-encoded multifunctional protein and a major determinant of symptom expression in a susceptible plant. Here, we show the involvement of clover yellow vein virus (ClYVV) HC-Pro in necrotic symptom expression in broad bean (Vicia faba cv. Wase). In this
The α-Terpineol to 1,8-Cineole Cyclization Reaction of Tobacco Terpene Synthases.
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Flowers of Nicotiana species emit a characteristic blend including the cineole cassette monoterpenes. This set of terpenes is synthesized by multiproduct enzymes, with either 1,8-cineole or α-terpineol contributing most to the volatile spectrum, thus referring to cineole or terpineol synthase,
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