9,10-epoxy-13-hydroxy-11-octadecenoic acid | 29907-59-3

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羟基酸及其衍生物
• 英文名称: 9,10-epoxy-13-hydroxy-11-octadecenoic acid
• 英文别名: 13-Hydroxy-9,10-epoxy-11-octadecenoic acid；8-[3-(3-hydroxyoct-1-enyl)oxiran-2-yl]octanoic acid
• CAS: 29907-59-3
• 化学式: C₁₈H₃₂O₄
• 分子量: 312.45
• InChiKey: BWLQUNFALXKBSJ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.1
• 重原子数：
  22
• 可旋转键数：
  14
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.83
• 拓扑面积：
  70.1
• 氢给体数：
  2
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  (Z,Z)-9,12-十八烷二烯酸二聚物 在 recombinant maize 9-lipoxygenase 、 氧气 、 recombinant divinyl ether synthase 13-DES of flax (Linum usitatissimum), wild-type 作用下， 以 aq. phosphate buffer 为溶剂， 反应 0.25h， 生成 9,10-epoxy-13-hydroxy-11-octadecenoic acid 、 9,10-epoxy-11-hydroxy-12-octadecenoic acid
  参考文献：
  名称：

  CYP74B 和 CYP74D 二乙烯基醚合酶具有通过定点诱变增强的侧氢过氧化物裂解酶和环氧醇合酶活性

  摘要：

  CYP74 细胞色素 P450 家族包括四种脂肪酸氢过氧化物代谢酶：丙二烯氧化合酶 (AOS)、氢过氧化物裂解酶 (HPL)、二乙烯基醚合酶 (DES) 和环氧醇合酶 (EAS)。目前的工作涉及三种重组 DES 的催化特异性，即番茄 (Solanum lycopersicum) 的 9-DES (LeDES, CYP74D1)、烟草 (Nicotiana tabacum) 的 9-DES (NtDES, CYP74D3) 和 13-DES (LuDES, CYP74B16) 亚麻 (Linum usitatissimum)，以及它们对定点诱变的改变。LeDES 和 NtDES 都将亚油酸和 α-亚麻酸的 9-氢过氧化物转化为二乙烯基醚 colleneic 和 colnelenic 酸（分别），只有少数 HPL 和 EAS 产物。相比之下，LeDES 和 NtDES 对亚油酸 13-过氧化氢

  DOI：

  10.1016/j.phytochem.2020.112512

文献信息

• A non-canonical caleosin from<i>Arabidopsis</i>efficiently epoxidizes physiological unsaturated fatty acids with complete stereoselectivity
  作者：Elizabeth Blée、Martine Flenet、Benoît Boachon、Marie-Laure Fauconnier

  DOI：10.1111/j.1742-4658.2012.08757.x

  日期：2012.10

  In plants, epoxygenated fatty acids (EFAs) are constituents of oil seeds as well as defence molecules and components of biopolymers (cutin, suberin). While the pleiotropic biological activities of mammalian EFAs have been well documented, there is a paucity of information on the physiological relevance of plant EFAs and their biosynthesis. Potential candidates for EFA formation are caleosin‐type peroxygenases which catalyze the epoxidation of unsaturated fatty acids in the presence of hydroperoxides as co‐oxidants. However, the caleosins characterized so far, which are mostly localized in seeds, are poor epoxidases. In sharp contrast, quantitative RT‐PCR analysis revealed that PXG4, a class II caleosin gene, is expressed in roots, stems, leaves and flowers of Arabidopsis. Expressed in yeast, PXG4 encodes a calcium‐dependent membrane‐associated hemoprotein able to catalyze typical peroxygenase reactions. Moreover, we show here that purified recombinant PXG4 is an efficient fatty acid epoxygenase, catalyzing the oxidation of cis double bonds of unsaturated fatty acids. Physiological linoleic and linolenic acids proved to be the preferred substrates for PXG4; they are oxidized into the different positional isomers of the monoepoxides and into diepoxides. An important regioselectivity was observed; the C‐12,13 double bond of these unsaturated fatty acids being the least favored unsaturation epoxidized by PXG4, linolenic acid preferentially yielded the 9,10‐15,16‐diepoxide. Remarkably, PXG4 catalyzes exclusively the formation of (R),(S)‐epoxide enantiomers, which is the absolute stereochemistry of the epoxides found in planta. These findings pave the way for the study of the functional role of EFAs and caleosins in plants.