5328-43-8Relevant articles and documents
DEOXYKETOHEXOSE ISOMERASE AND METHOD FOR PRODUCING DEOXYHEXOSE AND DERIVATIVE THEREOF USING SAME
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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.
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.
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