高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (6): 890.

• 论文 • 上一篇    下一篇

新型含硫半抗原的晶体结构、构象分析及其电性研究

谢桂阳, 孔亚丽, 王俊梅, 徐筱杰, 金声   

  1. 北京大学化学系, 北京 100871
  • 收稿日期:1998-08-01 出版日期:1999-06-24 发布日期:1999-06-24
  • 通讯作者: 徐筱杰
  • 作者简介:谢桂阳,男,31岁,博士研究生.
  • 基金资助:

    国家自然科学基金(批准号:29632004);天然药物及仿生药物国家重点实验室资助

Studies on Crystal Structure, Conformation Analysis of a New Designed Hapten Containing Sulfur

XIE Gui-Yang, KONG Ya-Li, WANG Jun-Mei, XU Xiao-Jie, JIN Sheng   

  1. Department of Chemistry, Peking University, Beijing, 100871
  • Received:1998-08-01 Online:1999-06-24 Published:1999-06-24

摘要: 分析了一种新设计的含硫半抗原N-苯甲酰牛磺酰基苯丙氨酸的晶体结构,确证了其中的S原子为四面体构型,可以用来模拟酰胺键水解的过渡态,并且发现了几个分子间氢键.运用分子力学程序MOLGEN对此化合物进行了优化,并与含P半抗原进行了比较.然后又比较了N_S_C键和N_P_C键的旋转构象分析图,发现N_S_C键只有一个低能构象.最后用MOPAC程序(AM1参数)计算了S原子周围的电荷分布.发现S原子周围的电荷分布与P原子周围的电荷分布相似.

关键词: 抗体酶, 半抗原, 分子设计, 肽键水解

Abstract: The crystal structure of a new designed hapten N-benzoyl tauryl phenylalanine was studied by XRD . The results showed that the configuration of sulfur atom is tetrahedron,-SO2NH-is close to transition state of amide hydrolysis and there are severa LIN termolecular hydrogen bonds. The crystal structure was optimized by Molgen program, and then compared with the hapten that contain phosphorus. The conformation analysis of N-S-C and N-P-C bonds showed that N-S-C had only one single low energy conformer. Their charges were also calculated by MOPAC program(AM1 calculation), and it is found that the charge distribution around Satom is very close to that of the Patom. Those results showed that the molecule could be used to induce antibodies with CPA activity.

Key words: Antibody enzyme, Hapten enzyme, Molecular design, Peptide hydrolysis

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