Tetranuclear Copper(II) Complexes Bridged by α-<scp>d</scp>-Glucose-1-Phosphate and Incorporation of Sugar Acids through the Cu<sub>4</sub> Core Structural Changes
= -13 cm(-1)). Complex 1a readily reacted with carboxylic acids to afford the tetranuclear copper(II) complexes, [Cu4mu-(alpha-D-Glc-1P)}2(mu-CA)2(bpy)4](NO3)2 [CA = CH3COO (3), o-C6H4(COO)(COOH) (4)]. Reactions with m-phenylenediacetic acid [m-C6H4(CH2COOH)2] also gave the discrete tetracopper(II) cationic complex [Cu4mu-(alpha-D-Glc-1P)}2(mu-m-C6H4(CH2COO)(CH2COOH))2(bpy)4](NO3)2 (5a) as well as
Surprising Bacterial Nucleotidyltransferase Selectivity in the Conversion of Carbaglucose-1-phosphate
作者:Kwang-Seuk Ko、Corbin J. Zea、Nicola L. Pohl
DOI:10.1021/ja045522j
日期:2004.10.1
understand the molecular determinants of carbohydrate binding as well as the search for more chemically and biochemically stable sugar derivatives and carbohydrate-based therapeutics has led to the synthesis of a variety of analogues that replace the glycosidic oxygen with sulfur or carbon. In contrast, the effect of substitution of the ring oxygen on the conformations and enzymatic tolerance of sugars has
molecular modeling studies of UDP-Xyl-4O. STD NMR results of Me-Xyl-4O are in good agreement with simulations of the intermediate UDP-Xyl-4O indicating a strong interaction of proton H3 with the enzyme, potentially caused by active site residue Ala79. In contrast, pyranoside binding pattern studies of methyl uronic acids showed some differences compared to previously published STD NMR results of UDP-glycosides
Electroorganic Synthesis 66: Selective Anodic Oxidation of Carbohydrates Mediated by TEMPO
作者:Karsten Schnatbaum、Hans J. Schäfer
DOI:10.1055/s-1999-3464
日期:1999.5
The carbohydrates 4-15 are anodically oxidized with 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) as mediator. Selective and complete reaction at the primary hydroxyl groups affords the corresponding carboxylic acid 16-32 in moderate to excellent yield. Methyl α-d-glucopyranoside is converted in 98% yield to the uronic acid 16. Cyclic voltammetry shows that the oxydation is base-catalyzed and the oxidation of the hydroxy group with TEMPO+ (2) is rate determining.
Synthesis of α(1→4)-linked non-natural mannoglucans by α-glucan phosphorylase-catalyzed enzymatic copolymerization
作者:Ryotaro Baba、Kazuya Yamamoto、Jun-ichi Kadokawa
DOI:10.1016/j.carbpol.2016.06.057
日期:2016.10
for removal of Pi as the precipitate with ammonium and magnesium in ammonia buffer containing Mg(2+) ion to produce α(1→4)-linked non-natural mannoglucans composed of Glc/Man units. The reaction was conducted in different feed ratios using the maltotriose primer at 40°C for 7days. The MALDI-TOF mass and (1)H NMR spectra of the products fully supported the mannoglucan structures.