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s adenosylmethionine/arabidopsis thaliana
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Strong cellular preference in the expression of a housekeeping gene of Arabidopsis thaliana encoding S-adenosylmethionine synthetase.
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S-Adenosylmethionine serves as a methyl group donor in numerous transmethylation reactions and plays a role in the biosynthesis of polyamines and ethylene. We have cloned and sequenced an S-adenosylmethionine synthetase gene (sam-1) of Arabidopsis thaliana. The deduced polypeptide sequence of the
Structure and expression analyses of the S-adenosylmethionine synthetase gene family in Arabidopsis thaliana.
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The plant, Arabidopsis thaliana, contains two S-adenosylmethionine synthetase-encoding genes (sam). Here, we analyze the structure and expression of the sam-2 gene and compare it with the previously described sam-1 gene. Northern-blot analysis using gene-specific probes shows that both sam-1 and
Structural roles of cysteine 50 and cysteine 230 residues in Arabidopsis thaliana S-adenosylmethionine decarboxylase.
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The Arabidopsis thaliana S-Adenosylmethionine decarboxylase (AdoMetDC) cDNA (GenBank U63633) was cloned. Site-specific mutagenesis was performed to introduce mutations at the conserved cysteine Cys(50), Cys(83), and Cys(230), and lys(81) residues. In accordance with the human AdoMetDC, the C50A and
Identification of functionally important residues of Arabidopsis thaliana S-adenosylmethionine decarboxylase.
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The Arabidopsis thaliana S-adenosylmethionine decarboxylase (AdoMetDC) cDNA (GenBank(TM) U63633) was cloned, and the AdoMetDC protein was expressed, purified, and characterized. The K(m) value for S-adenosylmethionine (AdoMet) is 23.1 microM and the K(i) value for methylglyoxal bis-(guanylhydrazone)
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
A single-nucleotide mutation in a gene encoding S-adenosylmethionine synthetase is associated with methionine over-accumulation phenotype in Arabidopsis thaliana.
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Met-overaccumulating mutants provide a powerful genetic tool for examining both the regulation of the Met biosynthetic pathway and in vivo developmental responses of gene expression to altered Met levels. We have previously reported the identification of two Arabidopsis thaliana Met
S-adenosylmethionine synthases in plants: Structural characterization of type I and II isoenzymes from Arabidopsis thaliana and Medicago truncatula.
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S-adenosylmethionine synthases (MATs) are responsible for production of S-adenosylmethionine, the cofactor essential for various methylation reactions, production of polyamines and phytohormone ethylene, etc. Plants have two distinct MAT types (I and II). This work presents the structural analysis
Molecular cloning and characterization of S-adenosylmethionine synthetase gene from Lycoris radiata.
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S-adenosylmethionine (SAM) synthetase catalyzes the synthesis of SAM, a molecule important for all cellular organisms. It is also considered to play an important role in salt tolerance of plants. Here, we cloned a Lycoris radiata (L. radiata) SAM synthetase gene LrSAMS to determine its biological
Reduced activity of Arabidopsis thaliana HMT2, a methionine biosynthetic enzyme, increases seed methionine content.
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In the S-methylmethionine cycle of plants, homocysteine methyltransferase (HMT) catalyzes the formation of two molecules of methionine from homocysteine and S-methylmethionine, and methionine methyltransferase (MMT) catalyzes the formation of methionine from S-methylmethionine using
Putative spermine synthases from Thalassiosira pseudonana and Arabidopsis thaliana synthesize thermospermine rather than spermine.
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Polyamines are involved in many fundamental cellular processes. Common polyamines are putrescine, spermidine and spermine. Spermine is synthesized by transfer of an aminopropyl residue derived from decarboxylated S-adenosylmethionine to spermidine. Thermospermine is an isomer of spermine and assumed
Different expression of an S-adenosylmethionine synthetase gene in transgenic tobacco callus modifies alkaloid biosynthesis.
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Transformed callus cultures of Nicotiana tabacum were generated in which the SAM-1 gene from Arabidopsis thaliana encoding S-adenosylmethionine synthetase (SAM-S), under the control of the 35S promoter, had been integrated. The presence of the SAM-1 gene was detected in all tested transformants and
Overexpression of a heterologous sam gene encoding S-adenosylmethionine synthetase in flax (Linum usitatissimum) cells: Consequences on methylation of lignin precursors and pectins.
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The Arabidopsis thaliana sam1 gene encoding S-adenosylmethionine synthetase (EC 2.5.1.6) was transferred to flax (Linum usitatissimum) cells via Agrobacterium tumefaciens. This enzyme catalyses the conversion of methionine to S-adenosylmethionine (SAM), the major methyl group donor in living cells.
Constitutive S-adenosylmethionine decarboxylase gene expression increases drought tolerance through inhibition of reactive oxygen species accumulation in Arabidopsis.
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Using subtractive hybridization analysis, the S-adenosylmethionine decarboxylase (SAMDC) gene from Capsicum annuum was isolated and renamed CaSAMDC. We generated independent transgenic Arabidopsis (Arabidopsis thaliana) lines constitutively expressing a 35S::CaSAMDC construct. Drought tolerance was
Transient occurrence of extrachromosomal DNA of an Arabidopsis thaliana transposon-like element, Tat1.
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Analysis of 11 genomic clones containing the S-adenosylmethionine synthetase 1 gene (sam1) of Arabidopsis thaliana revealed the presence of a 431-base-pair (bp) insertion in the 3' end of sam1 in one of these clones. The inserted sequence, called Tat1, shows structural features of a transposon. It
A distinctly regulated protein repair L-isoaspartylmethyltransferase from Arabidopsis thaliana.
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Protein-L-isoaspartate (D-aspartate) O-methyltransferases (EC 2.1.1.77) that catalyze the transfer of methyl groups from S-adenosylmethionine to abnormal L-isoaspartyl and D-aspartyl residues in a variety of peptides and proteins are widely distributed in procaryotes and eucaryotes. These enzymes
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