结合稳定的cystathionine桥梁的α-Conotoxin ImI保持了充分的功效和相同的三维结构
Zoltan Dekan1, Irina Vetter, Norelle L Daly
1Institute for Molecular Bioscience, The University of Queensland, St Lucia 4072, Queensland, Australia.
研究人员用稳定的硫乙烯替换了α-conotoxin ImI中的二硫化键. 一种类似物在α7尼古丁乙胆受体 (nAChR) 中保持了完全的对抗活性,显示出药物开发的潜力.
科学领域:
- 药用化学 医学化学
- 神经科学是一个神经科学.
- 类化学 类化学
背景情况:
- α-conotoxin ImI是α7尼古丁性乙胆受体 (nAChR) 的一个强有力的对手.
- 酸中的二硫化键可能易受氧化和还原作用,从而限制了它们的治疗潜力.
- 开发生物活性的稳定类型对药物发现至关重要.
研究的目的:
- 系统地用同位素,氧化还原稳定的cystathionine thioethers替换α-conotoxin ImI的二硫化键.
- 评估由此产生的乙烯类似物质的结构完整性和生物活性.
- 研究乙烯氧化对α7nAChR对抗性质的影响.
主要方法:
- 混合乙烯/二硫化物和α-conotoxin ImI.I.的双重cystathionine类似物的固体相合成.
- 使用 (1) H NMR 谱法进行结构性表征,以确认同质性.
- 在体外对抗性测试以确定α7nAChR的功效 (pIC50).
- 对乙烯氧化成硫氧化物对生物活性影响的研究.
主要成果:
- 实现了区域选择性 thioether 形成,产生混合 (2,3) 和双 (4) 类似物.
- 模拟物3表现出与野生型α-毒素ImI相同的α7nAChR对抗活性 (pIC50 = 6.41).
- 类似物2和4的活性略有降低 (pIC50分别为5.96和5.89).
- 乙烯的氧化到硫氧化物对功效产生了不同的影响,从30倍以上的降低到3倍的增加.
结论:
- 囊氨酸乙烯类似物可以作为α-conotoxin ImI中二硫化物键的稳定替代品.
- 模拟物3显示保存的生物活性,突出显示了结合以太开发稳定的nAChR抗剂的潜力.
- 该研究提供了对结构-活性关系和氧化还原状态对功能的影响的见解.
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