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glucuronic acid/gåsemad
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Production of d-glucuronic acid from myo-inositol using Escherichia coli whole-cell biocatalyst overexpressing a novel myo-inositol oxygenase from Thermothelomyces thermophile.
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D-glucuronic acid (GlcUA) is an important intermediate with numerous applications in the food, cosmetics, and pharmaceutical industries. Its biological production routes which employ myo-inositol oxygenase (MIOX) as the key enzyme are attractive. In this study, five diverse MIOX-encoding genes, from
Glucuronic acid in Arabidopsis thaliana xylans carries a novel pentose substituent.
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Glucuronic acids in Arabidopsis thaliana xylans exist in 4-O-methylated (MeGlcA) and non-methylated (GlcA) forms at a ratio of about 3:2. The matrix-assisted laser desorption/ionization mass spectrometry analysis of the endoxylanase liberated acidic oligosaccharides from the Arabidopsis
The biosynthesis of UDP-galacturonic acid in plants. Functional cloning and characterization of Arabidopsis UDP-D-glucuronic acid 4-epimerase.
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UDP-GlcA 4-epimerase (UGlcAE) catalyzes the epimerization of UDP-alpha-D-glucuronic acid (UDP-GlcA) to UDP-alpha-D-galacturonic acid (UDP-GalA). UDP-GalA is a precursor for the synthesis of numerous cell-surface polysaccharides in bacteria and plants. Using a biochemical screen, a gene encoding
Reconstruction of de novo pathway for synthesis of UDP-glucuronic acid and UDP-xylose from intrinsic UDP-glucose in Saccharomyces cerevisiae.
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UDP-D-glucuronic acid and UDP-D-xylose are required for the biosynthesis of glycosaminoglycan in mammals and of cell wall polysaccharides in plants. Given the importance of these glycans to some organisms, the development of a system for production of UDP-D-glucuronic acid and UDP-D-xylose from a
Down-regulation of UDP-glucuronic acid biosynthesis leads to swollen plant cell walls and severe developmental defects associated with changes in pectic polysaccharides.
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UDP-glucose dehydrogenase (UGD) plays a key role in the nucleotide sugar biosynthetic pathway, as its product UDP-glucuronic acid is the common precursor for arabinose, xylose, galacturonic acid, and apiose residues found in the cell wall. In this study we characterize an Arabidopsis thaliana double
Identification of a disaccharide side chain 2-O-α-D-galactopyranosyl-α-D-glucuronic acid in Arabidopsis xylan.
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Arabidopsis xylan consists of a linear chain of β-1,4-linked D-xylosyl residues, about 10% of which are substituted with single residues of α-D-glucuronic acid (GlcA) or 4-O-methyl-α-D-glucuronic acid (MeGlcA) at O-2. In addition, about 60% of xylosyl residues are acetylated at O-2 and/or O-3.
Role of UDP-Glucuronic Acid Decarboxylase in Xylan Biosynthesis in Arabidopsis.
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UDP-xylose (UDP-Xyl) is the Xyl donor used in the synthesis of major plant cell-wall polysaccharides such as xylan (as a backbone-chain monosaccharide) and xyloglucan (as a branching monosaccharide). The biosynthesis of UDP-Xyl from UDP-glucuronic acid (UDP-GlcA) is irreversibly catalyzed by
Three Arabidopsis DUF579 domain-containing GXM proteins are methyltransferases catalyzing 4-o-methylation of glucuronic acid on xylan.
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Xylan is made of a linear chain of β-1,4-linked xylosyl residues, some of which are substituted with side chains, such as glucuronic acid (GlcA), methylglucuronic acid (MeGlcA) and arabinose, depending on the source of xylan. Although past studies have revealed a number of genes involved in the
4-O-methylation of glucuronic acid in Arabidopsis glucuronoxylan is catalyzed by a domain of unknown function family 579 protein.
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The hemicellulose 4-O-methyl glucuronoxylan is one of the principle components present in the secondary cell walls of eudicotyledonous plants. However, the biochemical mechanisms leading to the formation of this polysaccharide and the effects of modulating its structure on the physical properties of
Arabidopsis GUX proteins are glucuronyltransferases responsible for the addition of glucuronic acid side chains onto xylan.
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Xylan, the second most abundant cell wall polysaccharide, is composed of a linear backbone of β-(1,4)-linked xylosyl residues that are often substituted with sugar side chains, such as glucuronic acid (GlcA) and methylglucuronic acid (MeGlcA). It has recently been shown that mutations of two
Biosynthesis of UDP-xylose. Cloning and characterization of a novel Arabidopsis gene family, UXS, encoding soluble and putative membrane-bound UDP-glucuronic acid decarboxylase isoforms.
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UDP-xylose (Xyl) is an important sugar donor for the synthesis of glycoproteins, polysaccharides, various metabolites, and oligosaccharides in animals, plants, fungi, and bacteria. UDP-Xyl also feedback inhibits upstream enzymes (UDP-glucose [Glc] dehydrogenase, UDP-Glc pyrophosphorylase, and
Biosynthesis of UDP-xylose: characterization of membrane-bound AtUxs2.
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UDP-xylose (UDP-Xyl) is a sugar donor for the synthesis of glycoproteins, polysaccharides, various metabolites, and oligosaccharides in plants, vertebrates, and fungi. In plants, the biosynthesis of UDP-Xyl from UDP-glucuronic acid (UDP-GlcA) appears to be catalyzed by numerous UDP-glucuronic acid
Nonradioactive enzyme measurement by high-performance liquid chromatography of partially purified sugar-1-kinase (glucuronokinase) from pollen of Lilium longiflorum.
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Here we present a highly sensitive and simple high-performance liquid chromatography (HPLC) method that enables specific quantification of glucuronokinase activity in partially purified extracts from pollen of Lilium longiflorum without radioactive labeled substrates. This assay uses a recombinant
Metabolic engineering of Escherichia coli for the biological synthesis of 7-O-xylosyl naringenin.
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Flavonoids are a group of polyphenolic compounds that have been recognized as important due to their physiological and pharmacological roles and their health benefits. Glycosylation of flavonoids has a wide range of effects on flavonoid solubility, stability, and bioavailability. We previously
Synthesis of flavonoid O-pentosides by Escherichia coli through engineering of nucleotide sugar pathways and glycosyltransferase.
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Plants produce two flavonoid O-pentoses, flavonoid O-xyloside and flavonoid O-arabinoside. However, analyzing their biological properties is difficult because flavonoids are not naturally produced in sufficient quantities. In this study, Escherichia coli was used to synthesize the plant-specific
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