Odorant Receptor 7D4 Activation Dynamics.

Odorant Receptor 7D4 Activation Dynamics.
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气味受体7D4激活动力学。

DOI:
10.1002/anie.201713065
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发表时间:
2018-04-16
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Golebiowski J
Golebiowski J
中科院分区:
其他
文献类型:
--
作者:
de March CA;Topin J;Bruguera E;Novikov G;Ikegami K;Matsunami H;Golebiowski J

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解读气味如何激活气味受体(OR)以及特定OR残基的变化如何影响其反应性对于理解我们如何闻到气味至关重要。结合定点诱变和功能测定与计算建模的联合方法已被用于探索OR7D4的信号传导机制。在这个OR中,遗传多态性影响我们对雄烯酮的感知。总共0.12毫秒的分子模拟预测,类似于从其他G蛋白偶联受体与已知的实验结构的观察,激活途径连接的配体和G蛋白结合位点。3D模型激活机制与体外数据相关,并显著预测OR7D4 WM变体不激活。在激活时,OR特异性序列基序是该机制的会聚点。我们的研究表明,强大的同源性建模可以作为一个强大的工具来捕捉或动态相关的嗅觉。气味受体7D4的选择性激活动力学通过计算建模来捕获。描述了螺旋6中特定序列基序的作用。
Deciphering how an odorant activates an odorant receptor (OR) and how changes in specific OR residues affect its responsiveness are central to understanding how we smell. A joint approach combining site-directed mutagenesis and functional assays with computational modeling has been used to explore the signaling mechanics of OR7D4. In this OR, a genetic polymorphism affects our perception of androstenone. A total of 0.12 ms molecular simulations predicted that, similarly to observations from other G protein-coupled receptors with known experimental structures, an activation pathway connects the ligand and G protein binding site. The 3D model activation mechanism correlates with in vitro data and notably predicts that the OR7D4 WM variant does not activate. Upon activation, an OR-specific sequence motif is the convergence point of the mechanism. Our study suggests that robust homology modeling can serve as a powerful tool to capture OR dynamics related to smell perception. The selective activation dynamics of the odorant receptor 7D4 is captured by computational modeling. The role of a specific sequence motif in helix six is described.
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