K2P路的膜结合状态是K2P路的膜结合状态
Werner Treptow1, Michael L Klein
1Laboratório de Biofísica, Departamento de Biologia Celular, Universidade de Brasília, Brasília, Brasil. treptow@unb.br
Journal of the American Chemical Society
|May 25, 2010
概括
双孔域 (K(2P)) 通道对于神经功能至关重要. 分子动力学模拟揭示了它们的C端域直接与膜结合,感知刺激以调节通道活动.
科学领域:
- 神经科学是一个神经科学.
- 生物物理学的生物物理.
- 分子生物学分子生物学
背景情况:
- 双孔域 (K(2P)) 通道对于神经功能至关重要.
- 它们的活动受到各种刺激的调节,包括膜脱极化,张力和pH.
- K ((2P) 通道的C端域充当传感器,集成信号来控制通道门.
研究的目的:
- 为了研究膜环境中的K(2P) 通道的结构.
- 阐明C端域与脂质双层相互作用的机制.
- 了解膜刺激如何转化为通道活动.
主要方法:
- 利用了完全原子化的分子动力学 (MD) 模拟.
- 构建了与TWIK相关的 (TREK) -1通道的两个不同的模型.
- 模拟道结构在水合的zwitterionic脂质双层内,大约为0.3微秒.
主要成果:
- 模拟的TREK-1通道采用了封闭的孔状结构.
- 观察到C端域吸附到脂质双层表面.
- 确定了C端与膜之间的直接物理和能量合.
结论:
- C-终端域与膜的相互作用是K(2P) 通道关门的关键特征.
- 这种合机制使通道能够响应与膜相关的刺激.
- 这项研究提供了关于细胞环境对K(2P) 通道调节的结构基础的见解.
相关概念视频
01:15Resting Potential Decay
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
At rest, the K+ is the main ion that moves across the membrane through...
01:15Resting Potential Decay
The resting membrane potential of a neuron (-70mV) is sustained due to the selective ion permeability of the membrane. At the resting potential, the membrane is slightly permeable to ions like sodium (Na+) and chloride (Cl−) and highly permeable to potassium ions (K+). Differences in the ions' concentration inside the cell compared to the outside are maintained by membrane transport proteins like channels and pumps.
At rest, the K+ is the main ion that moves across the membrane through...
At rest, the K+ is the main ion that moves across the membrane through...
01:24Non-gated Ion Channels
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.
01:24Non-gated Ion Channels
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.
01:26Voltage-gated Ion Channels
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 types of...
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 types of...
01:26Voltage-gated Ion Channels
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 types of...
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 types of...