5328-43-8Relevant articles and documents
DEOXYKETOHEXOSE ISOMERASE AND METHOD FOR PRODUCING DEOXYHEXOSE AND DERIVATIVE THEREOF USING SAME
-
Page/Page column 15, (2010/05/13)
Providing 1- or 6-deoxy products corresponding to all of aldohexoses, ketohexoses and sugar alcohols, as based on Deoxy-Izumoring, as well as a method for systematically producing those products. A method for producing deoxyketohexose and a derivative thereof using a deoxyketohexose isomerase derived from Pseudomonas cichorii ST-24 (FERM BP-2736), comprising epimerizing 1-deoxy D-ketohexose or 6-deoxy D-ketohexose or 1-deoxy L-ketohexose or 6-deoxy L-ketohexose at position 3 to produce the individually corresponding 1-deoxy D-ketohexose or 6-deoxy D-ketohexose or 1-deoxy L-ketohexose or 6-deoxy L-ketohexose as an intended product.
Isomerization of deoxyhexoses: green bioproduction of 1-deoxy-d-tagatose from l-fucose and of 6-deoxy-d-tagatose from d-fucose using Enterobacter agglomerans strain 221e
Yoshihara, Akihide,Haraguchi, Satoshi,Gullapalli, Pushpakiran,Rao, Davendar,Morimoto, Kenji,Takata, Goro,Jones, Nigel,Jenkinson, Sarah F.,Wormald, Mark R.,Dwek, Raymond A.,Fleet, George W.J.,Izumori, Ken
, p. 739 - 745 (2008/09/20)
1-Deoxy-d-tagatose was produced by the hydrogenation of 6-deoxy-l-galactose (l-fucose) to l-fucitol followed by oxidation with Enterobacter agglomerans 221e; a similar sequence on d-fucose afforded 6-deoxy-d-tagatose. Thus, the polylol dehydrogenase recognizes the d-galacto-configuration of both d-fucitol and l-fucitol. The procedures were conducted in water and show the power of green, environmentally friendly biotechnology in the preparation of new monosaccharides with a potential for novel bioactive properties. 6-Deoxy-d-tagatose was also synthesized from d-tagatose via the efficient formation of 1,2:3,4-di-O-isopropylidene-α-d-tagatofuranose; a difficult final removal of protecting groups by acid makes the biotechnological route more attractive.
Multiple Forms of Xylose Reductase in Candida intermedia: Comparison of Their Functional Properties Using Quantitative Structure-Activity Relationships, Steady-State Kinetic Analysis, and pH Studies
Nidetzky, Bernd,Brueggler, Kaspar,Kratzer, Regina,Mayr, Peter
, p. 7930 - 7935 (2007/10/03)
The xylose-fermenting yeast Candida intermedia produces two isoforms of xylose reductase: one is NADPH-dependent (monospecific xylose reductase; msXR), and another is shown here to prefer NADH ≈4-fold over NADPH (dual specific xylose reductase; dsXR). To compare the functional properties of the isozymes, a steady-state kinetic analysis for the reaction D-xylose + NAD(P)H + H + ? xylitol + NAD(P)+ was carried out and specificity constants (kcat/Kaldehyde) were measured for the reduction of a series of aldehydes differing in side-chain size as well as hydrogen-bonding capabilities with the substrate binding pocket of the enzyme. dsXR binds NAD(P)+ (KiNAD+ = 70 μM; KiNADP+ = 55 μM) weakly and NADH (Ki = 8 μM) about as tightly as NADPH (Ki = 14 μM). msXR shows uniform binding of NADPH and NADP + (KiNADP+ ≈ KiNADPH = 20 μM). A quantitative structure-activity relationship analysis was carried out by correlating logarithmic kcat/Kaldehyde values for dsXR with corresponding logarithmic kcat/Kaldehyde values for msXR. This correlation is linear with a slope of ≈1 (r2 = 0.912), indicating that no isozyme-related pattern of substrate specificity prevails and aldehyde-binding modes are identical in both XR forms. Binary complexes of dsXR-NADH and msXR-NADPH show the same macroscopic pK of ≈9.0-9.5, above which the activity is lost in both enzymes. A lower pK of 7.4 is seen for dsXR-NADPH. Specificity for NADH and greater binding affinity for NAD(P)H than NAD(P)+ are thus the main features of enzymic function that distinguish dsXR from msXR.
Analysis of Aldoses and Alditols by Capillary Gas Chromatography as Alditol Trifluoroacetates
Haga, Hidehiko,Nakajima, Terumi
, p. 1562 - 1564 (2007/10/02)
Analysis of aldoses and alditols by capillary gas chromatography as alditol trifluoroacetates was carried out by using a fused silica capillary column (cyanopropyl-bonded phase) and a hydrogen flame ionization detector.Seventeen alditols were completely resolved within 18 min.The detection limits were about 1-4 ng/injection which are one hundred times smaller than as those of a packed column.Special care was necessary in the use of internal standards for the simultaneous determination of multiple components, and good reproducibility was obtained by using double internal standards.Keywords- aldose; alditol; alditol trifluoroacetate; capillary gas chromatography
Chemische und Chemotaxonimische Untersuchungen der Pterophyten. LXII. Chemische Untersuchungen der Inhaltsstoffe von Arachniodes maximowiczii OHWI
Tanaka, Nobutoshi,Sakai, Hideko,Murakami, Takao,Saiki, Yasuhisa,Chen, Chiu-Ming,Iitaka, Yoichi
, p. 1015 - 1022 (2007/10/02)
Two new ent-rosane norditerpenes, ar-maximic acid (I) and ar-maximol (II), were isolated from the fronds of Arachniodes maximowiczii OHWI, and were shown to have the structures of 2-hydroxy-19-nor-ent-rosa-1,3,5(10),15(16)-tetraene 18-oic acid (I) and 2,18-dihydroxy-19-nor-ent-rosa-1,3,5(10),15(16)-tetraene (II) by chemical, spectroscopic and X-ray crystallographic methods.In addition, six glycosides of acyclic terpenes were isolated, and their structures were elucidated as 3(S)-linalool O-β-D-glucopyranoside (III), 3(S)-linalool O-β-D-(6'-O-β-L-fucopyranosyl)glucopyranoside (IV), 13-hydroxygeranyllinalool 13-O-β-D-(6'-O-β-L-fucopyranosyl)glucopyranoside (V), 13-hydroxygeranyllinalool 3,13-O-β-D-diglucopyranoside (VI), 13-methoxygeranyllinalool O-β-D-glucopyranoside (VII) and 15-methoxy-3,7,11,15-tetramethylhexadeca-1,6(E),10(E),13(E)-tetraene O-β-D-glucopyranoside (VIII), mainly by spectroscopic methods.Compounds VII and VIII, obtained as an inseparable mixture may be artefacts.Maltol and maltol β-D-glucoside were also isolated.Keywords - Arachniodes maximowiczii; ent-rosane-type norditerpene; acyclic monoterpene glycoside; acyclic diterpene glycoside; Aspidiaceae; fern; chemotaxonomy; X-ray analysis; 13C-NMR
CHARACTERIZATION OF 6-DEOXY-D-ALTRITOL IN THE CELL-WALL POLYSACCHARIDE OF Nocardia asteroides R 399
Voiland, Annie,Michel, Georges
, p. 283 - 288 (2007/10/02)
A polyol, found in the cell-wall of Nocardia asteroides R 399 as a component of a neutral polysaccharide mainly composed of D-arabinose and D-galactose, was identified by mass spectrometry, paper chromatography, thin-layer chromatography, and gas chromatography as 6-deoxy-D-altritol.