波谱学杂志

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四棱草中环八肽的二维核磁共振谱研究

张永洪1,窦辉2,毛希安1*   

  1. 1.中国科学院武汉物理与数学研究所,湖北武汉 430071;  2.中国科学院成都生物研究所,四川成都 610041
  • 收稿日期:2002-04-23 修回日期:2002-08-27 出版日期:2003-06-05 发布日期:2003-06-05
  • 作者简介:张永洪(1970-),男,湖北天门人,博士.*通讯联系人
  • 基金资助:

    国家自然科学基金资助项目(29725307).

2D NMR STUDY OF A CYCLIC OCTOPEPTIDE

ZHANG Yong-hong1, DOU Hui2, MAO Xi-an1*   

  1. 1.Wuhan Institute of Physics & Mathematics, The Chinese Academy of Sciences, Wuhan 430071, China;
    2.Chengdu Institute of Biology, The Chinese Academy of Sciences, Chengdu 610041, China
  • Received:2002-04-23 Revised:2002-08-27 Online:2003-06-05 Published:2003-06-05
  • About author:Zhang Yong-hong:Correspondence author
  • Supported by:

    国家自然科学基金资助项目(29725307).

摘要:

以二维核磁共振谱(2D NMR)解析了从四棱草核磁共振谱(Schnabelia oligophylla Hand.Mazz.)中分离的环八肽——四棱草环肽(Schnabepeptide)的结构. 通过1H-1H COSY和1H-1H TOCSY归属了组成四棱草环肽的丝氨酸(L-Ser)、异亮氨酸(L-Ile)、甘氨酸(Gly)、色氨酸(D-Trp)、2个缬氨酸(L-Val)和2个脯氨酸(Pro)共8个氨基酸残基的质子耦合系统,13C NMR谱的归属则由HMQC和HMQC-TOCSY给出,由2D NOESY和HMBC对环肽各残基的连接方式进行了修正,鉴定的结果为Cyclo-(NH-Trp-Val-Gly-Val-Ser-Ile-Pro-Pro-CO).

关键词: 核磁共振, 归属, HMQC, 四棱草, 环八肽

Abstract:

2D NMR techniques (COSY, TOCSY, HMQC, HMQCTOCSY, HMBC, NOESY) were used to elucidate the structure of schnabepeptide, a cyclic octopeptide isolated from the whole plant of schnabelia oligophylla Hand. Mazz. (Lamiaceae). The proton-coupling network shown in the TOCSY spectrum suggests that the octopeptide contains eight amino acid residues (a L-Ser, a L-Ile, a Gly, a D-Trp, two L-Val and two Pro). The 2D NOESY and HMBC spectra show the sequential connectivity of schnabepeptide is cyclo-(NH-Trp-Val-Gly-Val-Ser-Ile-Pro-Pro-CO).

Key words: NMR, assignments, HMQC, structure, schnabelia oligophylla, cyclic octopeptide

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