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Accumulation of hydroxycinnamic acid amides induced by pathogen infection and identification of agmatine coumaroyltransferase in Arabidopsis thaliana.

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Hydroxycinnamic acid amides (HCAAs) are secondary metabolites involved in the defense of plants against pathogens. Here, we report the first identification of HCAAs, p-coumaroylagmatine, feruloylagmatine, p-coumaroylputrescine and feruloylputrescine, in Arabidopsis thaliana rosette leaves infected

Structural Study of Agmatine Iminohydrolase From Medicago truncatula, the Second Enzyme of the Agmatine Route of Putrescine Biosynthesis in Plants.

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Plants are unique eukaryotes that can produce putrescine (PUT), a basic diamine, from arginine via a three-step pathway. This process starts with arginine decarboxylase that converts arginine to agmatine. Then, the consecutive action of two hydrolytic enzymes, agmatine iminohydrolase (AIH)

Identification and characterization of plant agmatine iminohydrolase, the last missing link in polyamine biosynthesis of plants.

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The cloning, expression and characterization of plant agmatine iminohydrolase (AIH, also known as agmatine deiminase, EC 3.5.3.12) is described. Recombinant AIH of Arabidopsis thaliana forms dimers and catalyzes the specific conversion of agmatine to N-carbamoylputrescine and ammonia. Biochemical

Sustained mitogen-activated protein kinase activation reprograms defense metabolism and phosphoprotein profile in Arabidopsis thaliana.

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Mitogen-activated protein kinases (MAPKs) target a variety of protein substrates to regulate cellular signaling processes in eukaryotes. In plants, the number of identified MAPK substrates that control plant defense responses is still limited. Here, we generated transgenic Arabidopsis thaliana

Sclerotinia sclerotiorum infection triggers changes in primary and secondary metabolism in Arabidopsis thaliana

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Sclerotinia sclerotiorum is a devastating plant pathogen that causes substantial losses in various agricultural crops. Although plants have developed some well-known defense mechanisms against invasive fungi, much remains to be learned about plant responses to fungal pathogens. In this study we

Hetero- and homodimerization of Arabidopsis thaliana arginine decarboxylase AtADC1 and AtADC2.

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The arginine decarboxylase enzyme (ADC) carries out the production of agmatine from arginine, which is the precursor of the first polyamine (PA) known as putrescine; subsequently, putrescine is turned into the higher PAs, spermidine and spermine. In Arabidopsis thaliana PA production occurs only

The Neighboring Subunit Is Engaged to Stabilize the Substrate in the Active Site of Plant Arginases

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Arginine acts as a precursor of polyamines in plants in two known pathways, agmatine and ornithine routes. It is decarboxylated to agmatine by arginine decarboxylase, and then transformed to putrescine by the consecutive action of agmatine iminohydrolase and N-carbamoylputrescine amidohydrolase.

Chlorella viruses contain genes encoding a complete polyamine biosynthetic pathway.

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Two genes encoding the putative polyamine biosynthetic enzymes agmatine iminohydrolase (AIH) and N-carbamoylputrescine amidohydrolase (CPA) were cloned from the chloroviruses PBCV-1, NY-2A and MT325. They were expressed in Escherichia coli to form C-terminal (His)6-tagged proteins and the

The diverse bacterial origins of the Arabidopsis polyamine biosynthetic pathway.

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We functionally identified the last remaining step in the plant polyamine biosynthetic pathway by expressing an Arabidopsis thaliana agmatine iminohydrolase cDNA in yeast. Inspection of the whole pathway suggests that the arginine decarboxylase, agmatine iminohydrolase, N-carbamoylputrescine

Involvement of polyamines in the interacting effects of low temperature and mineral supply on Pringlea antiscorbutica (Kerguelen cabbage) seedlings.

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Pringlea antiscorbutica, which is the sole endemic crucifer in the subantarctic zone, undergoes seedling development in a harsh and cold environment. Since, at the mature stage, this species exhibits several adaptations linked to cold tolerance such as high polyamine levels, potential adaptations

Dual functioning of plant arginases provides a third route for putrescine synthesis.

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Two biosynthetic routes are known for putrescine, an essential plant metabolite. Ornithine decarboxylase (ODC) converts ornithine directly to putrescine, while a second route for putrescine biosynthesis utilizes arginine decarboxylase (ADC) to convert arginine to agmatine, and two additional

Differential regulation of root arginine catabolism and polyamine metabolism in clubroot-susceptible and partially resistant Arabidopsis genotypes.

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The hypertrophy and hyperplasia of infected roots into clubs are the intrinsic characteristics of clubroot, one of the economically most important diseases in Brassica crops worldwide. Polyamines, arginine (Arg)-derived metabolites, have long been recognized as cell proliferation and differentiation

Characterization of the two arginine decarboxylase (polyamine biosynthesis) paralogues of the endemic subantarctic cruciferous species Pringlea antiscorbutica and analysis of their differential expression during development and response to environmental stress.

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Arginine decarboxylase (ADC) is a key enzyme involved in the synthesis of polyamines, which have been implicated in developmental processes and stress responses in higher plants. An ancestral ADC gene appears to have been duplicated at the origin of the Brassicaceae family, thus yielding two

Arabidopsis ADC1 functions as an Nδ -acetylornithine decarboxylase.

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Polyamines are small aliphatic amines found in almost all organisms, ranging from bacteria to plants and animals. In most plants, putrescine, the metabolic precursor for longer polyamines, such as spermidine and spermine, is produced from arginine, with either agmatine or ornithine as intermediates.

Bridging the gap between plant and mammalian polyamine catabolism: a novel peroxisomal polyamine oxidase responsible for a full back-conversion pathway in Arabidopsis.

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In contrast to animals, where polyamine (PA) catabolism efficiently converts spermine (Spm) to putrescine (Put), plants have been considered to possess a PA catabolic pathway producing 1,3-diaminopropane, Delta(1)-pyrroline, the corresponding aldehyde, and hydrogen peroxide but unable to

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