4-O-β-D-glucopyranosyl-N-acetyl-D-glucosamine

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: 4-O-β-D-glucopyranosyl-N-acetyl-D-glucosamine
• 英文别名: N-[(2R,3R,4S,5R)-3,5,6-trihydroxy-1-oxo-4-[(2S,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyhexan-2-yl]acetamide
• 化学式: C₁₄H₂₅NO₁₁
• 分子量: 383.353
• InChiKey: HESSGHHCXGBPAJ-URFZRFJVSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -5
• 重原子数：
  26
• 可旋转键数：
  9
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.86
• 拓扑面积：
  206
• 氢给体数：
  8
• 氢受体数：
  11

反应信息

• 作为产物：
  描述：

  N-乙酰氨基葡萄糖 、 α-D-glucopyranose 1-phosphate disodium 在 Ruminococcus albus cellobiose phosphorylase Y₆₄₈V mutant 作用下， 以 aq. buffer 为溶剂， 反应 5.0h， 生成 4-O-β-D-glucopyranosyl-N-acetyl-D-glucosamine
  参考文献：
  名称：

  Modulation of acceptor specificity of Ruminococcus albus cellobiose phosphorylase through site-directed mutagenesis

  摘要：

  Cellobiose phosphorylase (EC 2.4.1.20, CBP) catalyzes the reversible phosphorolysis of cellobiose to alpha-D-glucose 1-phosphate (Glc1P) and D-glucose. Cys485, Tyr648, and Glu653 of CBP from Ruminococcus albus, situated at the +1 subsite, were mutated to modulate acceptor specificity. C485A, Y648F, and Y648V were active enough for analysis. Their acceptor specificities were compared with the wild type based on the apparent kinetic parameters determined in the presence of 10 mM Glc1P. C485A showed higher preference for D-glucosamine than the wild type. Apparent k(cat)/K-m values of Y648F for D-mannose and 2-deoxy-D-glucose were 8.2- and 4.0-fold higher than those of the wild type, respectively. Y648V had synthetic activity toward N-acetyl-D-glucosamine, while the other variants did not. The oligosaccharide production in the presence of the same concentrations of wild type and each mutant was compared. C485A produced 4-O-beta-D-glucopyranosyl-D-glucosamine from 10 mM Glc1P and D-glucosamine at a rate similar to the wild type. Y648F and Y648V produced 4-O-beta-D-glucopyranosyl-D-mannose and 4-O-beta-D-glucopyranosyl-N-acetyl-D-glucosamine much more rapidly than the wild type when D-mannose and N-acetyl-D-glucosamine were used as acceptors, respectively. After a 4 h reaction, the amounts of 4-O-beta-D-glucopyranosyl-D-mannose and 4-O-beta-D-glucopyranosyl-N-acetyl-D-glucosamine produced by Y648F and Y648V were 5.9- and 12-fold higher than the wild type, respectively. (C) 2013 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.carres.2013.06.010

文献信息

• Modulation of acceptor specificity of Ruminococcus albus cellobiose phosphorylase through site-directed mutagenesis
  作者：Ken Hamura、Wataru Saburi、Hirokazu Matsui、Haruhide Mori

  DOI：10.1016/j.carres.2013.06.010

  日期：2013.9

  Cellobiose phosphorylase (EC 2.4.1.20, CBP) catalyzes the reversible phosphorolysis of cellobiose to alpha-D-glucose 1-phosphate (Glc1P) and D-glucose. Cys485, Tyr648, and Glu653 of CBP from Ruminococcus albus, situated at the +1 subsite, were mutated to modulate acceptor specificity. C485A, Y648F, and Y648V were active enough for analysis. Their acceptor specificities were compared with the wild type based on the apparent kinetic parameters determined in the presence of 10 mM Glc1P. C485A showed higher preference for D-glucosamine than the wild type. Apparent k(cat)/K-m values of Y648F for D-mannose and 2-deoxy-D-glucose were 8.2- and 4.0-fold higher than those of the wild type, respectively. Y648V had synthetic activity toward N-acetyl-D-glucosamine, while the other variants did not. The oligosaccharide production in the presence of the same concentrations of wild type and each mutant was compared. C485A produced 4-O-beta-D-glucopyranosyl-D-glucosamine from 10 mM Glc1P and D-glucosamine at a rate similar to the wild type. Y648F and Y648V produced 4-O-beta-D-glucopyranosyl-D-mannose and 4-O-beta-D-glucopyranosyl-N-acetyl-D-glucosamine much more rapidly than the wild type when D-mannose and N-acetyl-D-glucosamine were used as acceptors, respectively. After a 4 h reaction, the amounts of 4-O-beta-D-glucopyranosyl-D-mannose and 4-O-beta-D-glucopyranosyl-N-acetyl-D-glucosamine produced by Y648F and Y648V were 5.9- and 12-fold higher than the wild type, respectively. (C) 2013 Elsevier Ltd. All rights reserved.