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通过小鼠微量胺相关受体TAAR7f对厌恶性气味物的分子识别
Anastasiia Gusach1, Yang Lee1, Armin Nikpour Khoshgrudi2,3
1MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK.
bioRxiv : the preprint server for biology
|July 18, 2023
概括
研究人员确定了与特定气味剂结合的小鼠微量胺相关受体7f (mTAAR7f) 的结构. 这揭示了TAARs如何识别气味,与气味受体 (ORs) 不同.
科学领域:
- 结构生物学是结构生物学.
- 神经科学是一个神经科学.
- 生物化学 生物化学
背景情况:
- 微氨基关联受体 (TAARs) 是参与气味检测的G蛋白结合受体.
- TAAR与氨基酶受体有相似之处,这表明相关的连接体识别机制.
- 了解TAAR结构对于阐明嗅觉信号通路至关重要.
研究的目的:
- 为了确定与气味剂结合的小鼠TAAR (mTAAR7f) 的结构.
- 阐明TAARs中联结和激活的结构基础.
- 将TAAR激活机制与其他G蛋白结合受体进行比较.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定与N,N-二甲基环胺 (DMCH) 和Gs蛋白结合的mTAAR7f的结构.
- 用变异性研究和分子动力学模拟来研究受体激活.
- 结构分析的重点是带结合部位和相互作用.
主要成果:
- 与DMCH结合的mTAAR7f-Gs复合体的冷-EM结构被解析为2.9 Å.
- DMCH通过范德瓦尔斯力和与酸残留物的电荷-电荷相互作用,结合到一种疏水性正位.
- DMCH 的结合部位与气味受体 OR51E2 的结合部位不同.
- 受体激活似乎与β-上腺受体类似,DMCH与关键激活残留物直接相互作用.
结论:
- 确定的结构为TAAR连接体识别的分子机制提供了洞察力.
- TAAR激活与氨基酶受体有相似之处,但在配体相互作用中表现出独特的特征.
- 这项研究为了解TAAR在嗅觉和其他生理过程中的功能奠定了基础.
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