氨基化物通道BEST1是由细胞外GABA激活的
Swati Pant1,2, Stephanie W Tam1,3, Stephen B Long1
1Structural Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065.
概括
贝斯特罗芬-1 (BEST1) 是一种化物通道,由神经递质胺酸 (GABA) 直接激活. 这一发现揭示了GABA信号传递和BEST1通道调节的新机制.
科学领域:
- 分子生物学分子生物学
- 神经科学是一个神经科学.
- 离子通道生理学 离子通道生理学
背景情况:
- 贝斯托芬-1 (BEST1) 是一种已知的化物通道,涉及各种生理过程.
- 建议BEST1与主要的抑制性神经递质胺酸 (GABA) 之间存在潜在的联系.
- 佳能GABA受体包括GABABG蛋白结合受体和GABAA化物通道,对于中枢神经系统功能至关重要.
研究的目的:
- 研究BEST1和GABA之间的直接相互作用.
- 阐明GABA介导的BEST1通道激活的结构基础和机制.
- 为了确定BEST1是否作为GABA导入的离子通道.
主要方法:
- 对BEST的功能电生理学研究1.1.
- 确定人类和的原子分辨率晶体结构 BEST1.1.
- 对连接体结合部位和通道封闭机制的分析.
主要成果:
- 贝斯特1是由GABA直接激活的.
- 在BEST1通道的细胞外侧确定了一个特定的GABA结合部位.
- GABA结合稳定了BEST1的中央门的开放,称为"部".
- BEST1的门也被细胞内激活,这表明双联体控制.
结论:
- 贝斯特1作为一种新的GABA激活化物通道,与已知的GABA受体不同.
- 贝斯特1具有与GABAA受体无关的独特结构.
- 这一发现为研究GABAergic信号传递和BEST1通道生理学开辟了新的途径.
相关概念视频
G-Protein Gated Ion Channels
4.5K
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory...
Sensory...
4.5K
Ligand-Gated Ion Channel Receptor: Gating Mechanism
2.0K
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...
2.0K
Ligand-gated Ion Channels
12.0K
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that...
12.0K
Activation and Inactivation of G Proteins
6.4K
Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
6.4K
Mechanically-gated Ion Channels
6.1K
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
6.1K
Voltage-gated Ion Channels
7.8K
Voltage-gated ion channels are transmembrane proteins that open and close in response to changes in the membrane potential. They are present on the membranes of all electrically excitable cells such as neurons, heart, and muscle cells.
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
Generally, all voltage-gated ion channels have a 'voltage-sensing domain' that spans the lipid bilayer. The charged residues in the sensor move in response to the membrane potential changes that open the channel allowing ions movement. There are several...
7.8K


