对素2受体信号传输的动态和中间状态的结构和计算洞察力
Shun Yokoi1, Ryoji Suno2, Ayori Mitsutake1
1Department of Physics, School of Science and Technology, Meiji University, 1-1-1 Higashi-Mita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan.
The journal of physical chemistry. B
|May 9, 2024
概括
素2受体 (OX2R) 的激活涉及集体TM域运动,特别是TM3的垂直运动. 关键残留物Q134,V142和R152表现出显著的波动,影响OX2R药物发现的联结和信号选择性.
科学领域:
- 结构生物学 结构生物学
- 计算化学的计算化学
- 药理学 药理学是指药理学的学科.
背景情况:
- 素2受体 (OX2R) 是一种G蛋白结合受体 (GPCR),对调节睡眠-清醒周期至关重要.
- 了解GPCR激活动态和中间状态对于药物发现至关重要,特别是对细胞内信号的精确控制.
- 以前的研究依赖于静态结构数据,缺乏对动态激活机制的洞察力.
研究的目的:
- 通过分子动力学 (MD) 模拟来研究激活过程中Orexin 2受体 (OX2R) 的动态运动.
- 为了识别OX2R激活和信号传递所涉及的关键残留物和结构运动.
- 提供对中间状态的洞察力,可以为OX2R.偏向性激动剂的发展提供信息.
主要方法:
- 对各种OX2R系统进行了30个独立的微秒级分子动力学 (MD) 模拟.
- 应用放松模式分析,以识别激活期间跨膜 (TM) 域内的集体运动.
- 在TM3上分析了特定氨基酸残留物 (Q134,V142,R152) 的形状波动及其与TM3运动的关系.
主要成果:
- 在OX2R激活过程中识别了TM域的集体运动,TM3与膜相比表现出显著的垂直运动.
- 突出了TM3上的三个关键残留物 (Q134,V142,R152),它们具有与TM3运动相关的大量形状波动.
- 观察到OX2R-Gi信号复合体稳定在一个类似于非正规 (NC) 中间状态的构造中.
结论:
- 该研究阐明了OX2R激活的动态方面,揭示了TM3的作用和特定的残留动态.
- 提供了对连接体结合识别和信号选择性的洞察,与Q134和R152.2的平衡变化相关.
- 关于动态中间状态的发现,包括NC类状态,为设计针对OX2R的偏向激动剂提供了基础.
更多相关视频
09:09Preparation and Delivery of Protein Microcrystals in Lipidic Cubic Phase for Serial Femtosecond Crystallography
Published on: September 20, 2016
11.5K
07:30HSV-Mediated Transgene Expression of Chimeric Constructs to Study Behavioral Function of GPCR Heteromers in Mice
Published on: July 9, 2016
7.3K
相关概念视频
The Two-State Receptor Model
1.9K
The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with...
The binding affinity of a drug determines its interaction with...
1.9K
Opioid Receptors: Overview
749
Opioid receptors, including the mu (μ, MOR), delta (δ, DOR), and kappa (κ, KOR) types, belong to the rhodopsin family of G protein-coupled receptors. These receptors are located throughout the central and peripheral nervous systems and in non-neuronal tissues such as macrophages and astrocytes. Opioid receptor ligands can be categorized into agonists or antagonists. Highly selective agonists include [d-Ala2, MePhe4, Gly(ol)5]-enkephalin or DAMGO for MOR, [D-Pen2,...
749
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.2K
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
2.2K
Quantitative Aspects of Drug-Receptor Interaction
974
The receptor occupancy theory connects a drug's response to the number of occupied receptors. With higher drug concentrations, more receptors are occupied, leading to increased responses. The formation of drug-receptor complexes involves association and dissociation rates, which reach equilibrium when the forward and backward reactions are equal. The equilibrium association constant (Ka) and its inverse, the equilibrium dissociation constant (Kd), indicate drug affinity. Higher Ka and lower...
974
