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相关概念视频

G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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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...
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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

Voltage-gated Ion Channels

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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...
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Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

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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...
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Ion Channels01:19

Ion Channels

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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...
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Non-gated Ion Channels01:24

Non-gated Ion Channels

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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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相关实验视频

Updated: Jul 20, 2025

Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects
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Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects

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人类的刺是一个质子通道

Bingxu Liu1,2,3, Rebecca J Carlson1,4, Ivan S Pires3

  • 1Broad Institute, Cambridge, MA, USA.

Science (New York, N.Y.)
|August 3, 2023
PubMed
概括

干扰素基因刺激剂 (STING) 作为质子通道,调节细胞过程. 这种通道活性对于炎症酶激活和LC3B脂化至关重要,但不能诱导干扰素,提供治疗点.

更多相关视频

Sedimentation Equilibrium of a Small Oligomer-forming Membrane Protein: Effect of Histidine Protonation on Pentameric Stability
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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相关实验视频

Last Updated: Jul 20, 2025

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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels
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Site Directed Spin Labeling and EPR Spectroscopic Studies of Pentameric Ligand-Gated Ion Channels

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科学领域:

  • 免疫学
  • 细胞生物学
  • 分子生物学

背景情况:

  • 细胞器中的质子泄漏表明非正规的轻链3B (LC3B) 脂化和炎症酶激活.
  • 这些过程通常是在干扰素基因刺激器 (STING) 激活时引起的.

研究的目的:

  • 为了研究人类的STING作为质子通道的假设.
  • 确定STING潜在通道活动在下游细胞事件中的作用,如LC3B脂化和炎症酶激活.

主要方法:

  • 结构分析以确定STING的假设通道接口.
  • 在激活STING时测量Golgi的pH值变化.
  • 在脂质体中重建STING以评估质子传输.
  • 使用一种STING激动剂的化合物53 (C53),以抑制STING活动和质子流.
  • 评估C53对STING诱导的LC3B脂化和炎症酶激活的影响.

主要成果:

  • 导致高尔基的pH值增加,
  • 复制的STING在脂质体中表现出了超膜质子运输能力.
  • 在细胞模型和脂质体中,化合物53 (C53) 有效地阻断了STING诱导的质子流.
  • C53还抑制了STING诱导的LC3B脂化和炎症酶激活,强调了STING对这些通路的通道功能的必要性.

结论:

  • 人类的刺作为一个质子通道.
  • STING的质子通道活性对于诱导LC3B脂化和炎症酶激活至关重要.
  • 可以将STING的干扰素诱导功能与其在LC3B脂化和炎症酶激活中的作用分开,这表明它有不同的功能机制.