(R)-2-((2R,4aR,6R,7R,8R,8aS)-7-Acetylamino-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-propionic acid 4-nitro-phenyl ester | 666728-50-3

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡喃二恶英
• 英文名称: (R)-2-((2R,4aR,6R,7R,8R,8aS)-7-Acetylamino-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-propionic acid 4-nitro-phenyl ester
• CAS: 666728-50-3
• 化学式: C₂₅H₂₈N₂O₁₀
• 分子量: 516.505
• InChiKey: UHORPQLWBGBOOD-IPUAKSJFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.26
• 重原子数：
  37.0
• 可旋转键数：
  8.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.44
• 拓扑面积：
  144.69
• 氢给体数：
  1.0
• 氢受体数：
  10.0

反应信息

• 作为反应物：
  描述：

  (R)-2-((2R,4aR,6R,7R,8R,8aS)-7-Acetylamino-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-propionic acid 4-nitro-phenyl ester 在 palladium on activated charcoal 氢气 、 溶剂黄146 、 三乙胺 作用下， 以 甲醇 、 N,N-二甲基甲酰胺 为溶剂， 反应 24.0h， 生成 (2R)-2-[[(2S)-2-[[(2R)-2-[(2R,3S,4R,5R,6R)-5-acetamido-3-hydroxy-2-(hydroxymethyl)-6-methoxyoxan-4-yl]oxypropanoyl]amino]propanoyl]amino]-5-[[(2S)-6-amino-1-[[(2R)-1-[[(1R)-1-carboxyethyl]amino]-1-oxopropan-2-yl]amino]-1-oxohexan-2-yl]amino]-5-oxopentanoic acid
  参考文献：
  名称：

  Synthetic Peptidoglycan Substrates for Penicillin-Binding Protein 5 of Gram-Negative Bacteria

  摘要：

  The major constituent of the bacterial cell wall, peptidoglycan, is comprised of repeating units of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) with an appended peptide. Penicillin-binding proteins (PBPs) are involved in the final stages of bacterial cell wall assembly. Two activities for PBPs are the cross-linking of the cell wall, carried out by DD-transpeptidases, and the DD-peptidase activity, that removes the terminal D-Ala residue from peptidoglycan. The DD-peptidase activity moderates the extent of the cell wall cross-linking. There exists a balance between the two activities that is critical for the well-being of bacterial cells. We have cloned and purified PBP5 of Escherichia coli. The membrane anchor of this protein was removed, and the enzyme was obtained as a soluble protein. Two fragments of the polymeric cell wall of Gram-negative bacteria (compounds 5 and 6) were synthesized. These molecules served as substrates for PBP5. The products of the reactions of PBP5 and compounds 5 and 6 were isolated and were shown to be D-Ala and the fragments of the substrates minus the terminal D-Ala. The kinetic parameters for these enzymic reactions were evaluated. PBP5 would appear to have the potential for turnover of as many as 1.4 million peptidoglycan strands within a single doubling time (i.e., generation) of E. coli.

  DOI：

  10.1021/jo035397e
• 作为产物：
  描述：

  甲基2-乙酰氨基-2-脱氧-BETA-D-吡喃葡萄糖苷 在 吡啶 、 4 A molecular sieve 、 sodium hydride 、 对甲苯磺酸 作用下， 以 N,N-二甲基甲酰胺 、 乙腈 为溶剂， 反应 20.0h， 生成 (R)-2-((2R,4aR,6R,7R,8R,8aS)-7-Acetylamino-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-propionic acid 4-nitro-phenyl ester
  参考文献：
  名称：

  Synthetic Peptidoglycan Substrates for Penicillin-Binding Protein 5 of Gram-Negative Bacteria

  摘要：

  The major constituent of the bacterial cell wall, peptidoglycan, is comprised of repeating units of N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) with an appended peptide. Penicillin-binding proteins (PBPs) are involved in the final stages of bacterial cell wall assembly. Two activities for PBPs are the cross-linking of the cell wall, carried out by DD-transpeptidases, and the DD-peptidase activity, that removes the terminal D-Ala residue from peptidoglycan. The DD-peptidase activity moderates the extent of the cell wall cross-linking. There exists a balance between the two activities that is critical for the well-being of bacterial cells. We have cloned and purified PBP5 of Escherichia coli. The membrane anchor of this protein was removed, and the enzyme was obtained as a soluble protein. Two fragments of the polymeric cell wall of Gram-negative bacteria (compounds 5 and 6) were synthesized. These molecules served as substrates for PBP5. The products of the reactions of PBP5 and compounds 5 and 6 were isolated and were shown to be D-Ala and the fragments of the substrates minus the terminal D-Ala. The kinetic parameters for these enzymic reactions were evaluated. PBP5 would appear to have the potential for turnover of as many as 1.4 million peptidoglycan strands within a single doubling time (i.e., generation) of E. coli.

  DOI：

  10.1021/jo035397e

文献信息

• Activation for Catalysis of Penicillin-Binding Protein 2a from Methicillin-Resistant <i>Staphylococcus </i><i>a</i><i>ureus</i> by Bacterial Cell Wall
  作者：Cosimo Fuda、Dusan Hesek、Mijoon Lee、Ken-ichiro Morio、Thomas Nowak、Shahriar Mobashery

  DOI：10.1021/ja0434376

  日期：2005.2.1

  Methicillin-resistant Staphylococcus aureus (MRSA) has acquired a unique penicillin-binding protein (PBP), PBP 2a, which has rendered the organism resistant to the action of all available beta-lactam antibiotics. The X-ray structure of PBP 2a shows the active site in a closed conformation, consistent with resistance to inhibition by beta-lactam antibiotics. However, it is known that PBP 2a avidly cross-links the S. aureus cell wall, which is its physiological function. It is shown herein that synthetic fragments of the bacterial cell wall bind in a saturable manner to PBP 2a and cause a conformational change in the protein that makes the active site more accessible to binding to a beta-lactam antibiotic. These observations and measurements point to a novel strategy by nature to keep the active site of PBP 2a sheltered from the inhibitory activity of the antibiotics, yet it becomes available to the polymeric cell wall by a requisite conformational change for the critical cell wall cross-linking reaction.