绘制C-linker域对CNBD通道门极性的贡献
Jenna L Lin1, Yongchang Chang2, Debanjan Tewari2
1Department of Anesthesiology, Washington University School of Medicine, St. Louis, Missouri; Center for the Investigation of Membrane Excitability Diseases, Washington University School of Medicine, St. Louis, Missouri; Graduate Program in Biochemistry, Biophysics, & Structural Biology, Washington University School of Medicine, St. Louis, Missouri.
Biophysical journal
|April 28, 2024
概括
周期性核酸结合域 (CNBD) 离子通道家族的C终端域和C链接器区域显著影响它们的门极性. 超极化激活通道的关键是C-链接器间子单元接口内的相互作用残留物.
科学领域:
- 分子生物学分子生物学
- 生物物理学的生物物理.
- 离子通道生理学 离子通道生理学
背景情况:
- 循环核酸结合域 (CNBD) 离子通道对于心脏节拍和光感应等生物过程至关重要.
- 这些通道在结构上有相似之处,但在它们对膜电位的反应上有所不同,可以区分高极化激活通道和去极化激活通道.
- 以前的研究表明,电压感应和孔域合接口可以解释差异性门极性.
研究的目的:
- 调查C端域在确定CNBD离子通道门极性的作用.
- 在C端区域内识别特定的结构元素,这些元素会影响对膜潜力的道激活.
主要方法:
- 通过在不同的CNBD家族成员之间交换C端域来生成嵌合离子通道.
- 位点定向的突变发生,特别是扫描突变发生,C-链接器区域.
- 作为对膜电位变化的反应,对离子通道封闭性能的功能分析.
主要成果:
- C终端域的组成从根本上决定了CNBD离子通道的门极性.
- 在C-linker区域的突变发生确定了在超极化依赖激活的关键的分子单元间接口的特定残留物.
- C-linker 间子单元接口在调节门的极性方面发挥了以前未知的作用.
结论:
- C终端域是CNBD离子通道中门极性的主要决定因素.
- 超极化激活通道的功能中,C-链接器间子单元接口至关重要.
- 这些发现为电压导离子通道功能的结构基础提供了新的见解.
相关概念视频
Ligand-gated Ion Channels
12.4K
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...
12.4K
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
Ligand Binding and Linkage
4.8K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K
Non-gated Ion Channels
6.8K
Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
Compared to the gated ion channels, the non-gated channels, also known as leakage or passive channels, have no gating mechanism....
6.8K
G-Protein Gated Ion Channels
4.6K
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...
4.6K
Ion Channels
87.0K
The movement of ions like sodium, potassium, and calcium into and out of the cell is essential to maintain the electrochemical gradient in living cells. The ion channels—a class of membrane transport proteins—help maintain this ionic gradient for the smooth functioning of physiological activities such as maintaining cell size and volume, conducting nerve impulses, and gas and nutrient exchange.
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
Ion channels are specialized integral membrane proteins on the plasma membrane that allow...
87.0K


