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相关概念视频

Mechanically-gated Ion Channels01:12

Mechanically-gated Ion Channels

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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...
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Voltage-gated Ion Channels01:26

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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...
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Voltage-gated Ion Channels

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Non-gated Ion Channels01:24

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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....
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Non-gated Ion Channels

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Controllable Ion Channel Expression through Inducible Transient Transfection
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构建一个温度敏感的离子通道.

Ming-Feng Tsai1, Christopher Miller1

  • 1Department of Biochemistry, Howard Hughes Medical Institute, Brandeis University, Waltham, MA 02453, USA.

Cell
|August 30, 2014
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概括
此摘要是机器生成的。

研究人员设计了温度不敏感的离子通道,使其对冷或热产生反应. 这种蛋白质工程方法揭示了离子通道温度间隔和环境响应性的关键原则.

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相关实验视频

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科学领域:

  • 生物物理学的生物物理.
  • 分子生物学分子生物学
  • 离子通道生理学 离子通道生理学

背景情况:

  • 了解温度敏感的离子通道门对于细胞功能至关重要.
  • 热感应背后的分子机制在很大程度上是未知的.
  • 电压通道通常缺乏固有的温度灵敏度.

研究的目的:

  • 研究温度敏感离子通道封闭的生物物理原理.
  • 设计一种对温度不敏感的通道,以响应热刺激.
  • 在离子通道中开发分子热感应模型.

主要方法:

  • 使用一种蛋白质工程策略.
  • 修改了电压控制的离子通道,以引入温度灵敏度.
  • 评估了对冷热刺激的反应中的通道封闭.

主要成果:

  • 成功地使一个对温度不敏感的通道对寒冷和热量有反应.
  • 确定了允许温度隔的关键结构或功能元素.
  • 为热传感的分子基础建立了一个可信的模型.

结论:

  • 蛋白质工程可以为离子通道赋予温度灵敏度.
  • 揭示了调节温度的离子通道功能的基本原理.
  • 提供了对环境感知分子机制的见解.