| 1458587-06-8

• 分子结构分类: 有机化合物 - 苯类化合物 - 芘
• CAS: 1458587-06-8
• 化学式: C₂₆H₂₀O₈
• 分子量: 460.44
• InChiKey: QOTFDLQHFBVWMK-SNYRDRRFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.71
• 重原子数：
  34.0
• 可旋转键数：
  3.0
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.19
• 拓扑面积：
  136.68
• 氢给体数：
  5.0
• 氢受体数：
  7.0

反应信息

• 作为产物：
  描述：

  苯并(a)芘-7,8-二酮 、 苯并(a)芘-7,8-二醇 在 alamethicin I 、 magnesium chloride 、 1,4-二巯基-2,3-丁二醇 作用下， 以 aq. phosphate buffer 为溶剂， 反应 0.5h， 生成 O8-monoglucuronsyl-B[a]P-7,8-catechol 、
  参考文献：
  名称：

  Interception of Benzo[a]pyrene-7,8-dione by UDP Glucuronosyltransferases (UGTs) in Human Lung Cells

  摘要：

  Polycyclic aromatic hydrocarbons (PAHs) are environmental and tobacco carcinogens. Proximate carcinogenic PAR trans-dihydrodiols are activated by human aldo-keto reductases (AKRs) to yield electrophilic and redox-active o-quinones. Interconversion among benzo[a]pyrene (B[a]P)-7,8-dione, a representative PAR o-quinone, and its corresponding catechol generates a futile redox-cycle with the concomitant production of reactive oxygen species (ROS). We investigated whether glucuronidation of B[a]P-7,8-catechol by human UDP glucuronosyltransferases (UGTs) could intercept the catechol in three different human lung cells. RT-PCR showed that UGTIA1, 1A3, and 2B7 were only expressed in human lung adenocarcinoma A549 cells. The corresponding recombinant UGTs were examined for their kinetic constants and product profile using B[a]P-7,8-catechol as a substrate. B[a]P-7,8-dione was reduced to B[a]P-7,8-catechol by dithiothreitol under anaerobic conditions and then further glucuronidated by the UGTs in the presence of uridine-5'-diphosphoglucuronic acid as a glucuronic acid group donor. UGT1A1 catalyzed the glucuronidation of B[a]P-7,8-catechol and generated two isomeric O-monoglucuronsyl-B[a]P-7,8-catechol products that were identified by RP-HPLC and by LC-MS/MS. By contrast, UGT1A3 and 2B7 catalyzed the formation of only one monoglucuronide, which was identical to that formed in A549 cells. The kinetic profiles of three UGTs followed Michaelis-Menten kinetics. On the basis of the expression levels of UGT1A3 and UGT2B7 and the observation that a single monoglucuronide was produced in A549 cells, we suggest that the major UGT isoforms in A549 cells that can intercept B[a]P-7,8-catechol are UGT1A3 and 2B7.

  DOI：

  10.1021/tx400268q