对TAS1R2跨膜域激活的分子动力学见解
Yongcheng Lu1,2, Xinyi Ma1,2, Ziyue Meng1,2
1Department of Pharmaceutical Sciences, School of Pharmacy and Pharmaceutical Sciences, Bouvé College of Health Sciences, Northeastern University, Boston, MA 02115, USA.
甜味受体 (STR) 通过TAS1R2/TAS1R3异构体起作用. 分子动力学模拟揭示了由激动剂和对抗剂诱导的独特结构变化,揭示了对味觉受体激活机制的新见解.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 甜味受体 (STRs),C类G蛋白结合受体 (GPCRs),是TAS1R2/TAS1R3的异构体.
- 单独的TAS1R2或其跨膜域 (TMD) 可以作为受体起作用.
- 以前的研究表明,甜味剂 (S819) 和抑制剂 (阿米洛里德) 与TAS1R2-TMD结合,但机制尚不清楚.
研究的目的:
- 研究人类TAS1R2-TMD (hTAS1R2-TMD) 的联体诱导的构造动态.
- 阐明STR激活的原子层次机制,由激动剂和对抗剂激活.
- 为设计新型甜味剂和味道调节剂提供结构基础.
主要方法:
- 微秒级分子动力学 (MD) 模拟.
- 对hTAS1R2-TMD进行的模拟与S819 (激动剂),阿米洛里德 (对抗剂) 结合,并在阿波状态.
- 对形状变化和相互作用网络进行比较分析.
主要成果:
- 激素和对抗体结合明显调节关键结构开关,包括离子锁 (E6.35-R3.50).
- 一个新的盐桥 (D7.32-R3.32) 被确定,在活性状态中优先形成.
- 观察到结和疏水网络中的体特异性重新排列.
结论:
- 激动剂和抗剂通过不同的结构机制差异调节TAS1R2激活.
- 新的D7.32-R3.32盐桥可能会作为TAS1R2.2.的独特分子开关.
- 这些发现提供了原子学的洞察力,并为设计新的调味化合物的结构基础.
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