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biotin/arabidopsis
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Pagina 1 a partire dal 93 risultati
A newly discovered function of peroxisomes: involvement in biotin biosynthesis.
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In plants, peroxisomes are the organelles involved in various metabolic processes and physiological functions including β-oxidation, mobilization of seed storage lipids, photorespiration, and hormone biosynthesis. We have recently shown that, in fungi and plants, peroxisomes play a vital role in
Biotin Attachment Domain-Containing Proteins Irreversibly Inhibit Acetyl CoA Carboxylase.
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The first committed step in fatty acid synthesis is mediated by acetyl-CoA carboxylase (ACCase), a biotin-dependent enzyme that carboxylates acetyl-CoA to produce malonyl-CoA. ACCase can be feedback regulated by short-term or long-term exposure to fatty acids in the form of Tween 80 (predominantly
Biotin synthesis in higher plants: purification and characterization of bioB gene product equivalent from Arabidopsis thaliana overexpressed in Escherichia coli and its subcellular localization in pea leaf cells.
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Biotin synthase catalyses the final step in the biotin biosynthetic pathway and is encoded by the bioB gene in Escherichia coli. To investigate the conversion of dethiobiotin to biotin in the plant kingdom, the cDNA encoding the bioB gene product equivalent from Arabidopsis thaliana was used to
Evidence for multiple forms of biotin holocarboxylase synthetase in pea (Pisum sativum) and in Arabidopsis thaliana: subcellular fractionation studies and isolation of a cDNA clone.
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The intracellular compartmentation of biotin holocarboxylase synthetase has been investigated in pea (Pisum sativum) leaves, by isolation of organelles and fractionation of protoplasts. Enzyme activity was mainly located in cytosol (approx. 90% of total cellular activity). Significant activity was
Isolation of cDNAs from Brassica napus encoding the biotin-binding and transcarboxylase domains of acetyl-CoA carboxylase: assignment of the domain structure in a full-length Arabidopsis thaliana genomic clone.
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One independent and two overlapping rape cDNA clones have been isolated from a rape embryo library. We have shown that they encode a 2.3 kb and a 2.5 kb stretch of the full-length acetyl-CoA carboxylase (ACCase) cDNA, corresponding to the biotin-binding and transcarboxylase domains respectively.
Human biotin-containing subunit of 3-methylcrotonyl-CoA carboxylase gene (MCCA): cDNA sequence, genomic organization, localization to chromosomal band 3q27, and expression.
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3-Methylcrotonyl-CoA carboxylase (MCCase; EC 6.4.1.4) is a mitochondrial biotin enzyme and plays an essential role in the catabolism of leucine and isovalerate in animals, bacterial species, and plants. MCCase consists of two subunits, those that are biotin-containing and non-biotin-containing. The
Biotin synthesis in higher plants: isolation of a cDNA encoding Arabidopsis thaliana bioB-gene product equivalent by functional complementation of a biotin auxotroph mutant bioB105 of Escherichia coli K12.
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Biotin synthase is involved in the conversion of dethiobiotin to biotin in bacteria, yeast and higher plants. We isolated a complete cDNA (1.3 kb) encoding A. thaliana bioB-gene product by functional complementation of the bioB105 biotin auxotroph mutant of Escherichia coli K12 using an A. thaliana
Biotin synthesis in plants. The first committed step of the pathway is catalyzed by a cytosolic 7-keto-8-aminopelargonic acid synthase.
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Biochemical and molecular characterization of the biotin biosynthetic pathway in plants has dealt primarily with biotin synthase. This enzyme catalyzing the last step of the pathway is localized in mitochondria. Other enzymes of the pathway are however largely unknown. In this study, a genomic-based
Molecular cloning and characterization of the cDNA coding for the biotin-containing subunit of the chloroplastic acetyl-coenzyme A carboxylase.
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We report the molecular cloning and sequence of the cDNA coding for the biotin-containing subunit of the chloroplastic acetylcoenzyme A (CoA) carboxylase (ACCase) of Arabidopsis thaliana (CAC1). The 3' end of the CAC1 sequence, coding for a peptide of 94 amino acids, which includes a putative
Is plant biotin holocarboxylase synthetase a bifunctional enzyme?
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Holocarboxylase synthetases (HCSs) catalyse the biotinylation of biotin-dependent carboxylases in both prokaryotes and eukaryotes. In Escherichia coli and Bacillus subtilis, the protein also acts as a transcriptional repressor that regulates the synthesis of biotin. Previously, we isolated and
The plant biotin synthase reaction. Identification and characterization of essential mitochondrial accessory protein components.
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In plants, the last step of the biotin biosynthetic pathway is localized in mitochondria. This chemically complex reaction is catalyzed by the biotin synthase protein, encoded by the bio2 gene in Arabidopsis thaliana. Unidentified mitochondrial proteins in addition to the bio2 gene product are
Purification and properties of the chloroplastic form of biotin holocarboxylase synthetase from Arabidopsis thaliana overexpressed in Escherichia coli.
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Holocarboxylase synthetases (HCSs) are key enzymes in biotin utilisation in both prokaryotes and eukaryotes. In a previous study, we demonstrated that, in plants, HCS activity is localised in cytosol, chloroplasts and mitochondria. We also described the cloning and sequencing of a full-length cDNA
Arrested Embryos from the bio1 Auxotroph of Arabidopsis thaliana Contain Reduced Levels of Biotin.
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The bio1 auxotroph of Arabidopsis thaliana is a recessive embryonic lethal that forms normal plants in the presence of biotin. The purpose of this study was to determine whether aborted seeds produced by heterozygous plants grown without vitamin supplements contained reduced levels of biotin. Two
Characterization of the cDNA and gene coding for the biotin synthase of Arabidopsis thaliana.
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Biotin, an essential cofactor, is synthesized de novo only by plants and some microbes. An Arabidopsis thaliana expressed sequence tag that shows sequence similarity to the carboxyl end of biotin synthase from Escherichia coli was used to isolate a near-full-length cDNA. This cDNA was shown to code
Complementation of an Arabidopsis thaliana biotin auxotroph with an Escherichia coli biotin biosynthetic gene.
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The Arabidopsis thaliana biotin auxotroph biol was rendered prototrophic by transformation with a chimeric transgene containing the Escherichia coli bio A gene driven by a constitutive promoter. The bio A gene encodes the biotin biosynthetic enzyme 7, 8-diaminopelargonic acid aminotransferase.
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