高等学校化学学报 ›› 1996, Vol. 17 ›› Issue (10): 1550.

• 论文 • 上一篇    下一篇

油菜花粉十二肽的二维核磁共振研究

宋艳玲1, 高新风1, 万开科1, 孙红圻2, 金声1   

  1. 1. 北京大学化学与分子工程学院, 北京 100871;
    2. 南京大学配位化学国家重点实验室
  • 收稿日期:1995-12-16 出版日期:1996-10-24 发布日期:1996-10-24
  • 通讯作者: 金声
  • 作者简介:宋艳玲,女,54岁,副教授.
  • 基金资助:

    国家自然科学基金;国家教委博士点基金

2D NMR Studies of Chinese Rape Pollen Dodecapeptide

SONG Yan-Ling1, GAO Xin-Feng1, WAN Kai-Ke1, SUN Hong-Yin2, JIN Sheng1   

  1. 1. College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871;
    2. Bruker Instruments Ltd., Coordination Chemistry State Key Laboratory, Nanjing Unviersity
  • Received:1995-12-16 Online:1996-10-24 Published:1996-10-24

摘要: 用核磁共振方法对油菜花粉十二肽溶液构象进行了研究。利用2DCOSY和NOESY归属了1H NMR谱的全部共振峰,用Karplus方程从肽键N-H质子与α-H质子的偶合常数计算出了所有肽键的二面角θ及Φ,并对其进行不同温度及不同溶剂条件下的观测;结果表明,在水溶液中该肽链为无规卷曲结构,个别肽段存在γ-turn构象。

关键词: 花粉, 多肽, 二维核磁共振

Abstract: The dodecapeptide(RPP) is an active peptide,which we extracted from chinese rape pollen.The dodecapeptide enhances the activity of TNFon murine tumor cells and also shows immunopromotive activities.The possible conformation of the RPP,which has been previously studied by circular dichroism,has been studied by one and two dimensional NMR spectroscopy.All resonance assignments were made by use of two dimensional correlation spectroscopy.The problem of sequential resonance assignments was solved by using two dimensional NOE spectroscopy.The dihedral angles of the amide planes of the RPP,were calculated from the measured coupling constants using Karplus equation.The temperature coefficient and NOEin different solvents together suggest that RPP exists mainly as random coil in aqueous solution and some sections in the RPPexist as γ-turn.

Key words: Pollen, Peptide, 2D NMR

TrendMD: