波谱学杂志

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二蕊荷莲豆环肽B的NMR应用研究

滕荣伟,丁中涛,何以能,杨崇仁,王德祖*   

  1. 中国科学院昆明植物研究所,云南昆明, 650204
  • 收稿日期:2002-09-23 修回日期:2003-01-28 出版日期:2003-03-05 发布日期:2003-03-05
  • 作者简介:滕荣伟(1975-), 男, 博士, 从事植物化学研究,E-mail: tengrongwei@hotmail.com *通讯联系人

A NMR STUDY ON PLANT CYCLOPEPTIDE DRYMARIN B

TENG Rong-wei, DING Zhong-tao, HE Yi-neng, YANG Cong-ren, WANG De-zu*   

  1. Kunming Institute of Botany, The Chinese Acdemy of Sciences, Kuming 650204, China
  • Received:2002-09-23 Revised:2003-01-28 Online:2003-03-05 Published:2003-03-05
  • About author:TENG Rong-wei,E-mail: tengrongwei@hotmail.com

摘要:

植物环肽的1H 和13C NMR图谱, 由于各种氨基酸自旋系统质子和碳的化学位移非常接近,谱峰高度重叠,结构解析比较困难. 文中以二蕊荷莲豆环肽B为例讨论了
现代2D NMR新技术,在植物环肽结构解析中的应用. HMQC-TOCSY图谱在氢谱方向和碳谱方向分别提供每一个氨基酸自旋系统内的氢和除季碳外碳的全相关信息,从而将每个氨基酸残基的NMR信号相互区分开来;结合1H-1H COSY 和 HMQC或HSQC图谱,就可以准确归属每个氨基酸的氢和碳的化学位移. 氨基酸残基之间的连接顺序可用HMBC、NOESY或ROESY图谱获得.

关键词: 核磁共振,  植物环肽, HMQC-TOCSY, 二蕊荷莲豆环肽B, 全归属

Abstract:

Object  ]Severe spectral overlap often occurs in the 1H and 13C NMR spectra of plant cyclopeptides because of the similarity in chemical shifts of different amino acid residuals.  This paper aims to look for suitable NMR techniques for structural elucidation of plant cyclopeptides. Methods 2D NMR techniques such as  HMQC, HMBC, ROESY, and HMQC-TOCSY were used to study the structure of Drymarin B, a cyclopeptide isolated from the plant Drymaria diandra B1 (Caryophyllaceae).  Results  The 1H and 13C chemical shifts of the amino acid residuals (except for the quaternary carbons) can be assigned simultaneously using 2D HMQC-TOCSY  because this technique provides not only total proton correlation in the  F2 dimension but also total carbon correlation (except for the quaternary carbons) in the F1 dimension. The linkages among the anino acid residuals can be determined by  long range correlations from the HMBC spectra or NOEs from the ROESY or NOESY spectra. Conclusion   The 2D NMR techniques are  efficient tools for structural elucidation of plant cyclopeptides.

Key words: NMR, plant cyclopeptide, HMQC-TOCSY, assignments, Drymarin B

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