Requires Mg2+ for maximal activity . The enzyme-catalysed reaction is reversible . In the reverse direction to that shown above, the enzyme is specific for alpha,alpha-trehalose as substrate, as it cannot use alpha- or beta-paranitrophenyl glucosides, maltose, sucrose, lactose or cellobiose . While the enzymes from the thermophilic bacterium Rubrobacter xylanophilus and the hyperthermophilic archaeon Pyrococcus horikoshii can use ADP-, UDP- and GDP-alpha-D-glucose to the same extent [2,3], that from the hyperthermophilic archaeon Thermococcus litoralis has a marked preference for ADP-alpha-D-glucose and that from the hyperthermophilic archaeon Thermoproteus tenax has a marked preference for UDP-alpha-D-glucose .
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The taxonomic range for the selected organisms is: Pyrococcus horikoshii The expected taxonomic range for this enzyme is: Bacteria, Archaea, Eukaryota
reaction mechanism, overview. The acceptor binding site of TreT shows a wide and commodious groove and lacks the long flexible loop that plays a gating role in ligand binding in trehalose phosphate synthase, TPS, EC 2.4.1.15. A wide space at the fissure between two domains and the relative shift of the N-domain in one of the crystal forms suggest that an interactive conformational change between two domains would occur, allowing a more compact architecture for catalysis
Requires Mg2+ for maximal activity [1]. The enzyme-catalysed reaction is reversible [1]. In the reverse direction to that shown above, the enzyme is specific for alpha,alpha-trehalose as substrate, as it cannot use alpha- or beta-paranitrophenyl glucosides, maltose, sucrose, lactose or cellobiose [1]. While the enzymes from the thermophilic bacterium Rubrobacter xylanophilus and the hyperthermophilic archaeon Pyrococcus horikoshii can use ADP-, UDP- and GDP-alpha-D-glucose to the same extent [2,3], that from the hyperthermophilic archaeon Thermococcus litoralis has a marked preference for ADP-alpha-D-glucose [1] and that from the hyperthermophilic archaeon Thermoproteus tenax has a marked preference for UDP-alpha-D-glucose [4].
GDP-alpha-D-glucose is the most favored in terms of reaction specificity, kcat/Km. UDP-alpha-D-glucose and ADP-alpha-D-glucose are employed with less preferences. The enzyme reversely cleaves alpha,alpha-trehalose to transfer the glucosyl moiety to various NDPs, efficiently producing NDP-alpha-D-glucose. Although ADP-alpha-D-glucose is the least favorable donor, the counterpart, ADP, is the most favorable acceptor for the reverse synthesis of NDP-alpha-D-glucose in kcat/Km. GDP and UDP are less preferred, compared to ADP
the enzyme reversely cleaves alpha,alpha-trehalose to transfer the glucosyl moiety to various NDPs, efficiently producing NDP-alpha-D-glucose. Although ADP-alpha-D-glucose is the least favorable donor, the counterpart, ADP, is the most favorable acceptor for the reverse synthesis of NDP-alpha-D-glucose in kcat/Km. GDP and UDP are less preferred, compared to ADP
the enzyme reversely cleaves alpha,alpha-trehalose to transfer the glucosyl moiety to various NDPs, efficiently producing NDP-alpha-D-glucose. Although ADP-alpha-D-glucose is the least favorable donor, the counterpart, ADP, is the most favorable acceptor for the reverse synthesis of NDP-alpha-D-glucose in kcat/Km. GDP and UDP are less preferred, compared to ADP
the enzyme reversely cleaves alpha,alpha-trehalose to transfer the glucosyl moiety to various NDPs, efficiently producing NDP-alpha-D-glucose. Although ADP-alpha-D-glucose is the least favorable donor, the counterpart, ADP, is the most favorable acceptor for the reverse synthesis of NDP-alpha-D-glucose in kcat/Km. GDP and UDP are less preferred, compared to ADP
GDP-alpha-D-glucose is the most favored in terms of reaction specificity, kcat/Km. UDP-alpha-D-glucose and ADP-alpha-D-glucose are employed with less preferences. The enzyme reversely cleaves alpha,alpha-trehalose to transfer the glucosyl moiety to various NDPs, efficiently producing NDP-alpha-D-glucose. Although ADP-alpha-D-glucose is the least favorable donor, the counterpart, ADP, is the most favorable acceptor for the reverse synthesis of NDP-alpha-D-glucose in kcat/Km. GDP and UDP are less preferred, compared to ADP
GDP-alpha-D-glucose is the most favored in terms of reaction specificity, kcat/Km. UDP-alpha-D-glucose and ADP-alpha-D-glucose are employed with less preferences. The enzyme reversely cleaves alpha,alpha-trehalose to transfer the glucosyl moiety to various NDPs, efficiently producing NDP-alpha-D-glucose. Although ADP-alpha-D-glucose is the least favorable donor, the counterpart, ADP, is the most favorable acceptor for the reverse synthesis of NDP-alpha-D-glucose in kcat/Km. GDP and UDP are less preferred, compared to ADP
molecular basis of the synthetic mechanism of trehalose, or the nucleotide sugar in the reverse reaction of TreT. TreT can utilize ADP-glucose and GDP-glucose as well as UDP-glucose to synthesize trehalose, the nucleotide sugar molecule is recognized by the nucleotide-sensing Gly-Gly-Leu motif that is located at the domain interface in many GT-B family members, and TreT contains this motif at residues 52-55, the acceptor molecule binds predominantly to the N-terminal domain
molecular basis of the synthetic mechanism of trehalose, or the nucleotide sugar in the reverse reaction of TreT. TreT can utilize ADP-glucose and GDP-glucose as well as UDP-glucose to synthesize trehalose, the nucleotide sugar molecule is recognized by the nucleotide-sensing Gly-Gly-Leu motif that is located at the domain interface in many GT-B family members, and TreT contains this motif at residues 52-55, the acceptor molecule binds predominantly to the N-terminal domain
the acceptor binding site of TreT shows a wide and commodious groove and lacks the long flexible loop that plays a gating role in ligand binding in trehalose phosphate synthase, TPS, active site, and donor and acceptor binding pocket structure, overview. A wide space at the fissure between two domains and the relative shift of the N-domain in one of the crystal forms suggest that an interactive conformational change between two domains would occur, allowing a more compact architecture for catalysis
the acceptor binding site of TreT shows a wide and commodious groove and lacks the long flexible loop that plays a gating role in ligand binding in trehalose phosphate synthase, TPS, active site, and donor and acceptor binding pocket structure, overview. A wide space at the fissure between two domains and the relative shift of the N-domain in one of the crystal forms suggest that an interactive conformational change between two domains would occur, allowing a more compact architecture for catalysis
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CRYSTALLIZATION (Commentary)
ORGANISM
UNIPROT
LITERATURE
purified enzyme free or as TreT-UDP binary complex, 10 mg/ml native enzyme from PEG 3350 25%, 0.2 M MgCl2, and 0.1 M sodium HEPES, 18°C, the selenomethionine-substituted protein crystal grow from 21% methoxy PEG 2000, 0.18 M ammonium sulfate, and 0.1 M sodium acetate, pH 4.6, for the UDP-glucose complex crystal, 5 mM UDPG is added to 10 mg/ml E326A protein for 1 h prior to setup of the crystallization using the same conditions as for the native crystal, X-ray diffraction structure determination and analysis at 2.3-3.0 A resolution, single-wavelength anomalous dispersion phasing
the enzyme may be useful for the regeneration of NDP-alpha-D-glucose from NDP, especially for ADP-alpha-D-glucose from ADP, with trehalose as a glucose resource
trehalose synthase from Pyrococcus horikoshii can be applied to the sugar nucleotide cycling process for the synthesis of functional alpha-galactosyl oligosaccharides, alpha-galactose epitopes and globotriose, using the effective regeneration of UDP-galactose
Coupling reactions of trehalose synthase from Pyrococcus horikoshii: Cost-effective synthesis and anti-adhesive activity of beta-galactosyl oligosaccharides using a one-pot three-enzyme system with trehalose
Catalytic reversibility of Pyrococcus horikoshii trehalose synthase: Efficient synthesis of several nucleoside diphosphate glucoses with enzyme recycling
Enzymatic synthesis of a galactose-containing trehalose analogue disaccharide by Pyrococcus horikoshii trehalose-synthesizing glycosyltransferase Inhibitory effects on several disaccharidase activities