4-ethynyl-4-hydroxy-2-oxotetrahydropyran | 1056176-42-1

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 内酯类
• 英文名称: 4-ethynyl-4-hydroxy-2-oxotetrahydropyran
• 英文别名: 4-Ethynyl-4-hydroxyoxan-2-one
• CAS: 1056176-42-1
• 化学式: C₇H₈O₃
• 分子量: 140.139
• InChiKey: CBRFTFKLELZRQF-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.5
• 重原子数：
  10
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.57
• 拓扑面积：
  46.5
• 氢给体数：
  1
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  4-ethynyl-4-hydroxy-2-oxotetrahydropyran 在 rabbit muscle pyruvate kinase 、 Streptococcus pneumoniae mevalonate kinase 、 Streptococcus pneumoniae phosphomevalonate kinase 、 5’-三磷酸腺苷 、 2-巯基乙醇 、 potassium hydroxide 、 magnesium chloride 作用下， 反应 97.0h， 生成
  参考文献：
  名称：

  Probing Ligand-binding Pockets of the Mevalonate Pathway Enzymes from Streptococcus pneumoniae

  摘要：

  Diphosphomevalonate (Mev.pp) is the founding member of a new class of potential antibiotics targeting the Streptococcus pneumoniae mevalonate (Mev) pathway. We have synthesized a series of Mev.pp analogues designed to simultaneously block two steps in this pathway, through allosteric inhibition of mevalonate kinase (MK) and, for five of the analogues, by mechanism-based inactivation of diphosphomevalonate decarboxylase (DPM-DC). The analogue series expands the C-3-methyl group of Mev.pp with hydrocarbons of varying size, shape, and chemical and physical properties. Previously, we established the feasibility of a prodrug strategy in which unphosphorylated Mev analogues could be enzymatically converted to the active Mev.pp forms by the endogenous MK and phosphomevalonate kinase. We now report the kinetic parameters for the turnover of non-, mono-, and diphosphorylated analogues as substrates and inhibitors of the three mevalonate pathway enzymes. The inhibition of MK by Mev.pp analogues revealed that the allosteric site is selective for compact, electron-rich C-3-subsitutents. The lack of reactivity of analogues with DPM-DC provided evidence, counter to the existing model, for a decarboxylation transition state that is concerted rather than dissociative. The Mev pathway is composed of three structurally and functionally conserved enzymes that catalyze consecutive steps in a metabolic pathway. The current work reveals that these enzymes exhibit significant differences in specificity toward R-group substitution at C-3 and that these patterns are explained well by changes in the volume of the C-3 R-group-binding pockets of the enzymes.

  DOI：

  10.1074/jbc.m109.098350
• 作为产物：
  描述：

  3-Hydroxy-3-(2-hydroxyethyl)pent-4-ynoic acid 生成 4-ethynyl-4-hydroxy-2-oxotetrahydropyran
  参考文献：
  名称：

  Mevalonate analogues as substrates of enzymes in the isoprenoid biosynthetic pathway of Streptococcus pneumoniae

  摘要：

  Survival of the human pathogen Streptococcus pneumoniae requires a functional mevalonate pathway, which produces isopentenyl diphosphate, the essential building block of isoprenoids. Flux through this pathway appears to be regulated at the mevalonate kinase (MK) step, which is strongly feedback-inhibited by diphosphomevalonate (DPM), the penultimate compound in the pathway. The human mevalonate pathway is not regulated by DPM, making the bacterial pathway an attractive antibiotic target. Since DPM has poor drug characteristics, being highly charged, we propose to use unphosphorylated, cell-permeable prodrugs based on mevalonate that will be phosphorylated in turn by MK and phosphomevalonate kinase (PMK) to generate the active compound in situ. To test the limits of this approach, we synthesized a series of C-3-substituted mevalonate analogues to probe the steric and electronic requirements of the MK and PMK active sites. MK and PMK accepted substrates with up to two additional carbons, showing a preference for small substituents. This result establishes the feasibility of using a prodrug strategy for DPM-based antibiotics in S. pneumoniae and identified several analogues to be tested as inhibitors of MK. Among the substrates accepted by both enzymes were cyclopropyl, vinyl, and ethynyl mevalonate analogues that, when diphosphorylated, might be mechanism-based inactivators of the next enzyme in the pathway, diphosphomevalonate decarboxylase. (C) 2009 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.bmc.2009.12.050