2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl-(1→3)-1,2,4,6-tetra-O-acetyl-α-D-mannopyranose | 152885-79-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl-(1→3)-1,2,4,6-tetra-O-acetyl-α-D-mannopyranose
• 英文别名: 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl-(1-3)-1,2,4,6-tetra-O-acetyl-α-D-mannopyranose
• CAS: 152885-79-5
• 化学式: C₂₈H₃₈O₁₉
• 分子量: 678.598
• InChiKey: KXQUPCAOOLXBPP-MSMUBDTHSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.83
• 重原子数：
  47.0
• 可旋转键数：
  12.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.71
• 拓扑面积：
  238.09
• 氢给体数：
  0.0
• 氢受体数：
  19.0

反应信息

• 作为反应物：
  描述：

  2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl-(1→3)-1,2,4,6-tetra-O-acetyl-α-D-mannopyranose 在 sodium methylate 、 zinc(II) chloride 作用下， 反应 1.58h， 生成 p-nitrophenyl 3-O-(α-D-glucopyranosyl)-α-D-mannopyranoside
  参考文献：
  名称：

  Inhibitors of endo-α-mannosidase. Part I. Derivatives of 3-O-(α-D-glucopyranosyl)-D-mannopyranose

  摘要：

  高尔基体膜内α-D-甘露聚糖酶从未成熟的N-链接糖蛋白的GlcMan9GlcNAc2寡糖中释放二糖αDGlc(1 → 3)DMan（34）。为了将水解产物34转化为该酶的有效抑制剂，对34的甘露糖单元的1-和2-位置进行了化学修饰。这些修饰包括将OH-1替换为氢（6）、氟（12）和对硝基苯氧（5）。最近报道，当34的OH-1和OH-2均被双键（葡糖醛衍生物8）或氢（1,2-二去氧9）替换时，产生了两种有效的抑制剂。9被证明比1-去氧6作为抑制剂强40倍。然而，对9的4-和6-位置进行进一步修饰，即去氧、甲基化和将OH-6替换为氨基，现在被发现在很大程度上消除了活性，表明9的OH-4和OH-6参与了与酶的氢键作用。

  DOI：

  10.1139/v93-239
• 作为产物：
  描述：

  2,3,4,6-tetra-O-benzyl-α/β-D-glucopyranosyl-(1-3)-1,2,4,6-tetra-O-acetyl-α-D-mannopyranose 在 palladium on activated charcoal 吡啶 、 氢气 作用下， 以 甲醇 、 乙酸乙酯 为溶剂， 反应 32.0h， 生成 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl-(1→3)-1,2,4,6-tetra-O-acetyl-α-D-mannopyranose
  参考文献：
  名称：

  Synthesis of α-D-Glucopyranosyl-(1-3)-α-D-Mannopyranosyl-(1-7)-4-Methylumbelliferone, A Fluorogenic Substrate for Endo-α-1,2-Mannosidase

  摘要：

  alpha -D-Glucopyranosyl-(1-3)-alpha -D-mannopyranosyl-(1-7)-4-methylumbelliferone (Glc-Man-Muf) was synthesized as a potential fluorogenic substrate for endo-alpha -1,2-mannosidase. The synthesis was designed in a convergent way. The glucose donor ethyl 2,3,4,6-tetra-O-benzyl-1-thio-beta -glucopyranoside and the mannose acceptor 1,2:4,6-di-O-isopropylidene-beta -mannopyranose were coupled in the presence of N-iodosuccinimide and trifluoromethanesulfonic acid to yield the corresponding disaccharide derivative. After conversion into peracetylated alpha -D-glucopyranosyl-(1-3)-alpha -D-mannopyranose the disaccharide was attached to 4-methylumbelliferone using the Helferich method. After separation of the desired isomer, deacetylation yielded the title compound. Glc-Man-Muf was used as st substrate in endomannosidase assays with rat liver Golgi preparations as an enzyme source (in the presence of the alpha -glucosidase inhibitor deoxynojirimycin). The degradation of Glc-Man-Muf was linear with protein up to 300 mug and with time up to 2 h. V-max and K-m were determined to be 0.17 nmol/mg x h and 3.7 mM, respectively.

  DOI：

  10.1080/07328300008544148

文献信息

• Structural and Kinetic Dissection of the<i>endo</i>-α-1,2-Mannanase Activity of Bacterial GH99 Glycoside Hydrolases from<i>Bacteroides</i> spp.
  作者：Zalihe Hakki、Andrew J. Thompson、Stephanie Bellmaine、Gaetano Speciale、Gideon J. Davies、Spencer J. Williams

  DOI：10.1002/chem.201405539

  日期：2015.1.26

  Glycoside hydrolase family 99 (GH99) was created to categorize sequence‐related glycosidases possessing endo‐α‐mannosidase activity: the cleavage of mannosidic linkages within eukaryotic N‐glycan precursors (Glc1–3Man9GlcNAc2), releasing mono‐, di‐ and triglucosylated‐mannose (Glc1–3‐1,3‐Man). GH99 family members have recently been implicated in the ability of Bacteroides spp., present within the gut

  糖苷水解酶家族99（GH99）的创建是为了对具有内切α-甘露糖苷酶活性的序列相关糖苷酶进行分类：真核N-聚糖前体（Glc 1-3 Man 9 GlcNAc 2）中甘露糖苷键的裂解，释放单，双-和triglucosylated甘露糖（GLC 1-3 -1,3-曼）。GH99家族成员最近与拟杆菌的能力有关 spp.spp。，存在于肠道菌群内，通过分解分支内的αMan-1,3-αMan→1,2-αMan-1,2-αMan序列来代谢真菌细胞壁α-甘露聚糖，从而释放α-1,3-甘露二糖偏离主要的α-1,6-甘露聚糖骨架。我们报告了一系列底物和抑制剂的开发，我们将其用于在动力学和结构上表征细菌拟南芥（Theactotaides thetaiotaomicron）和xylanisolvens的细菌GH99酶的这种新型内-α-1,2-甘露聚糖酶活性。这些数据表明大约为5 kJ mol -1对-2子位点中相