高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 915.

• 研究论文 • 上一篇    下一篇

SDS胶束溶液中Exendin-4活性类似物的结构分析

王硕1,于佳一2,李惟2,李菲1   

  1. 1. 吉林大学超分子结构与材料国家重点实验室,
    2. 生命科学学院, 长春 130012
  • 收稿日期:2010-11-15 修回日期:2010-12-27 出版日期:2011-04-10 发布日期:2011-03-09
  • 通讯作者: 李菲 E-mail:feili@jlu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 20973083, 20934002)资助.

Structural Analysis of an Active Analog of Exendin-4 in SDS Micelle Solution

WANG Shuo1, YU Jia-Yi2, LI Wei2, LI Fei1*   

  • Received:2010-11-15 Revised:2010-12-27 Online:2011-04-10 Published:2011-03-09
  • Contact: LI Fei E-mail:feili@jlu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 20973083, 20934002)资助.

摘要: Exendin-4(EX-4)是一种治疗II型糖尿病的潜在药物。研究发现用β-Asp和Gln同时替换EX-4中的Glu3和Tyr13得到的EX-4类似物比EX-4有更好的降糖效果和抗水解的稳定性。本文用核磁共振方法研究了SDS胶束溶液中EX-4和这种活性类似物的三维空间结构。结果表明在SDS胶束溶液中EX-4活性类似物与EX-4原始肽的结构都由具有α螺旋卷曲构象的中间区域和灵活的N端区域及形成Trp-cage结构的C端区域构成,但与原始肽结构不同的是类似物的螺旋区域向N端扩展了3个残基,螺旋结构向N端的延长可能改善了底物与受体的亲和力,提高了生物活性。

关键词: Exendin-4类似物, 三维空间结构, 核磁共振

Abstract: Exendin-4 (EX-4) is a drug candidate with established potential for treatment of type II diabetes. It has been found that one of its analogs with the substitutions of both β-Asp for Glu3 and Tyr for Gln13 have a prolongation in biological half life, an increase in cell proliferation and a remarkable improvement in reducing blood sugar with respect to EX-4. In this paper, we studied the structures of both EX-4 and this EX-4 analog in SDS micelles by NMR spectroscopy. The results showed that both EX-4 and its analog adopt α-helix structures with the N-termini disordered and the C-terminal parts folded as Trp-cage in the medium, but the EX-4 analog contains more helical turns in the N-terminal region than EX-4. The extension of helix to the N-terminus may favor affinity for extracellular domain of GLP-1 receptor and accurate positioning of the crucial N-terminal residues in the transmembrane domains responsible for receptor activation.

Key words: Exendin-4 analog, Structure, NMR

中图分类号: 

TrendMD: