波谱学杂志 ›› 1994, Vol. 11 ›› Issue (2): 219-222.

• 研究论文 • 上一篇    

中等规模多肽分子的2DNOESY实验问题

张一兵, 余亦华, 沈伟, 王绮文   

  1. 中国科学院上海有机化学研究所生命有机化学国家重点实验室, 上海 200032
  • 收稿日期:1993-01-04 修回日期:1993-04-20 出版日期:1994-06-05 发布日期:2018-01-20

2D NOESY EXPERIMENTAL PROBLEMS OF MEDIUM-SIZED PEPTIDES

Zhang Yibing, Yu Yihua, Shen Wei, Wang Qiwen   

  1. State Key Laboratory or Bio-organic and Natural products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032
  • Received:1993-01-04 Revised:1993-04-20 Online:1994-06-05 Published:2018-01-20

摘要: 由于中等规模多肽在水溶液中运动的特殊性(ω0τc≈1),2DNOESY谱上往往得不到相关讯息(采用合理的混合时间),而降低温度的余地也很小·本工作将少量氘代甲醇加到水溶液中,并将实验温度降到零下,实验取得成功。例如从一个九肽和一个十一肽的NOESY实验得到了很多残基内和残基间的NOESY相关讯息,足以作出归属并进一步计算质子间距离.

关键词: 2D NOESY, 中等规模多肽

Abstract: The main difficulty in 2D NOESY of mcdium-sized peptdes is lacking of cross-peaks, espccially in the region related with NH, For solving this problem, these authors use a mixed solvent,CD3OD/H2O, to dissolve peptides,which allows NMR measurements at low temperature.The increased viscosity of solution and the correlation times by low-temperature measurements made a lot of intra-and inter-residue NOES observable, which helped us unambiguously complete the assigmnents of a nonapeptide and an undccapcptide, and further in calculation of H-Hdistances.

Key words: 2D NOESY, Medium-sized peptides