细胞表面受体识别由肉毒神经毒素B的结构基础
Qing Chai1, Joseph W Arndt, Min Dong
1Department of Molecular Biology, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, USA.
Nature
|December 15, 2006
概括
肉毒神经毒素 (BoNTs) 通过化物和蛋白质受体结合神经末端. 这项研究揭示了BoNT/B与synaptotagmin II结合的晶体结构,详细介绍了它们的相互作用,并提供了阻断毒素进入的标.
科学领域:
- 神经科学是一个神经科学.
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 肉毒神经毒素 (BoNTs) 是一种非常强大的毒素,通过抑制神经递质释放而导致.
- 一个"双受体"模型表明,BoNTs用于神经末端的识别和进入,使用化物和蛋白质受体.
- 虽然BoNT/A,BoNT/B和BoNT/G的受体已知,但精确的分子识别机制仍然不清楚.
研究的目的:
- 阐明其蛋白质受体,Synaptotagmin II (Syt-II) 识别BoNT/B的分子细节.
- 为BoNT/B和Syt-II.II之间的相互作用提供结构性见解.
- 为了确定抑制BoNT受体结合的潜在目标.
主要方法:
- 用X射线晶体学来确定全长BoNT/B的结构,与2.6 Å分辨率的Syt-II识别域复合.
- 针对Syt-II的局部导向突变发生,以评估对BoNT/B结合的影响.
- 序列分析和分子对接,以调查保存的结合点和化物相互作用.
主要成果:
- 晶体结构显示Syt-II形成了一个螺旋环,与BoNT/B结合域上的疏水槽结合.
- 突变发生证实了Syt-II接口上特定氨基酸残留对BoNT/B结合的重要性.
- 结构和对接分析表明BoNT/B和BoNT/G中保留了疏水槽,以及一个广泛的化物结合部位,可能与BoNT/B和Syt-II相互作用.
结论:
- 该研究提供了BoNT/B由其蛋白质受体Syt-II.II识别的第一个结构视图.
- 鉴定到的疏水槽代表了BoNT/B和BoNT/G的保留结合点,为治疗干预提供了潜在的目标.
- 了解这些毒素受体相互作用对于开发阻止BoNT进入和毒性的策略至关重要.
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