Tyr-Pro-Phe-Phe-NHCH3 | 1021685-53-9

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: Tyr-Pro-Phe-Phe-NHCH3
• 英文别名: (2S)-1-[(2S)-2-amino-3-(4-hydroxyphenyl)propanoyl]-N-[(2S)-1-[[(2S)-1-(methylamino)-1-oxo-3-phenylpropan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]pyrrolidine-2-carboxamide
• CAS: 1021685-53-9
• 化学式: C₃₃H₃₉N₅O₅
• 分子量: 585.703
• InChiKey: WEITVBLLGNOHNQ-DZUOILHNSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  43
• 可旋转键数：
  12
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  154
• 氢给体数：
  5
• 氢受体数：
  6

反应信息

• 作为产物：
  描述：

  C₄₁H₄₅N₅O₇ 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 为溶剂， 反应 5.0h， 生成 Tyr-Pro-Phe-Phe-NHCH3
  参考文献：
  名称：

  Structure–activity study of endomorphin-2 analogs with C-terminal modifications by NMR spectroscopy and molecular modeling

  摘要：

  Endomorphin-2 (EM-2) is a putative endogenous mu-opioid receptor ligand. To get insight into the important role of C-terminal amide group of EM-2, we investigated herein a series of EM-2 analogs by substitution of the C-terminal amide group with -NHNH2, -NHCH3, -N(CH3)(2), -OCH3, -OCH2CH3, -OC(CH3) 3, and -CH2 -OH. Their binding affinity and bioactivity were determined and compared. Despite similar (analogs 1, 4, and 7) or decreased (analogs 2, 3,5, and 6) mu affinity in binding assays, all analogs showed low guinea pig ileum (GPI) and mouse vas deferens (MVD) potencies compared to their parent peptide. Interestingly, as for analogs 2 and 3 (a single and double N-methylation of C-terminal amide), the potency order with the K-i (mu) values was 2 > 3; for the C-terminal esterified analogs 4 -6, the potency order with the Ki (mu) values was 4 > 5 > 6. Thus, we concluded that the steric hindrance of C-terminus might play an important role in opioid receptor affinity. We further investigated the conformational properties of these analogs by 1D and 2D H-1 NMR spectroscopy and molecular modeling. Evaluating the ratios of cis-and trans-isomers, aromatic interactions, dihedral angles, and stereoscopic views of the most convergent conformers, we found that modi. cations at the C-terminal amide group of EM-2 affected these analog conformations markedly, therefore changed the opioid receptor affinity and in vitro bioactivity. (c) 2008 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.bmc.2008.05.001