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相关概念视频

Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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Pinching-off of Coated Vesicles01:32

Pinching-off of Coated Vesicles

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Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
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Autophagy01:27

Autophagy

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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Rab Cascades01:25

Rab Cascades

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Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.
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SNAREs and Membrane Fusion01:43

SNAREs and Membrane Fusion

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Once a transport vesicle has recognized its target organelle, the vesicular membrane needs to fuse with the target membrane to unload the cargo. Transmembrane proteins called SNAREs present on organelle membranes and their vesicles, mediate vesicle fusion.
SNAREs exist in pairs that symmetrically interact and catalyze the fusion of the lipid bilayers in vesicle and target organelle. v-SNARE in the vesicle membrane are single polypeptide chains that bind to a complementary t-SNARE, composed of 2...
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Neurons: The Axon01:21

Neurons: The Axon

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Axons are long, cytoplasmic processes of nerve cells capable of propagating electrical impulses known as action potentials. The cytoplasm or axoplasm of an axon contains neurofibrils, neurotubules, small vesicles, lysosomes, mitochondria, and various enzymes, all encased within the axolemma, the plasma membrane of the axon.
The axon attaches to the cell body at a cone-shaped elevation called the axon hillock. The initial part of the axon, closest to the hillock, is known as the initial segment....
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相关实验视频

Updated: Jun 23, 2025

Utilizing Combined Methodologies to Define the Role of Plasma Membrane Delivery During Axon Branching and Neuronal Morphogenesis
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Utilizing Combined Methodologies to Define the Role of Plasma Membrane Delivery During Axon Branching and Neuronal Morphogenesis

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一个初始的HOPS介导的融合事件对于自细胞从轴突终端开始自细胞运输至关重要.

Serena R Wisner1,2, Madison Chlebowski1, Amrita Mandal3

  • 1Department of Integrative Biology, University of Wisconsin-Madison, Madison, WI, USA.

Autophagy
|June 20, 2024
PubMed
概括

该HOPS复合体对于神经元自至关重要,使自细胞成熟和从轴突终端开始逆行运输成为可能. 这一发现澄清了与HOPS复杂相关的神经退行性疾病的细胞病理.

关键词:
阿克森航站楼的终端是Axon的终端.Vps18 Vps18 在线播放自自是自的过程.轴轴运输是一种轴轴运输.lysosome 溶解酶体是如何形成的神经元神经元的神经元

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Expanding the Toolkit for In Vivo Imaging of Axonal Transport
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Author Spotlight: Advanced Techniques for Visualizing Endogenous Axonal Transport Dynamics
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Author Spotlight: Advanced Techniques for Visualizing Endogenous Axonal Transport Dynamics

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相关实验视频

Last Updated: Jun 23, 2025

Utilizing Combined Methodologies to Define the Role of Plasma Membrane Delivery During Axon Branching and Neuronal Morphogenesis
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Expanding the Toolkit for In Vivo Imaging of Axonal Transport
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科学领域:

  • 神经科学是一个神经科学.
  • 细胞生物学 细胞生物学
  • 分子生物学分子生物学

背景情况:

  • 神经元自对于细胞健康至关重要,涉及轴突末端的自细胞形成和逆行运输,用于成熟和降解.
  • 破坏神经元自或自体运输会对神经元功能产生负面影响.
  • 从轴突终端开始逆行自细胞运输的分子机制仍然不完全理解.

研究的目的:

  • 研究HOPS (同型融合和蛋白质分类) 综合体在神经元自和自细胞运输中的作用.
  • 确定HOPS复杂功能是否对神经元中自细胞成熟和逆行运输启动至关重要.

主要方法:

  • 在HOPS复杂组件 (vps18和vps41) 中使用了具有功能丧失突变的斑马鱼菌株.
  • 通过分析Vps18.18中HOPS绑定域的内源性删除,确认了HOPS复杂干扰.
  • 采用溶酶蛋白酶的药理抑制来评估自细胞成熟对输送启动的要求.

主要成果:

  • 斑马鱼中HOPS复合物的破坏消除了自细胞成熟.
  • 失去HOPS功能特别扰乱了从轴突终端开始逆行自胞体运输的启动.
  • 药理抑制表明,自细胞成熟是启动逆行运输的先决条件.

结论:

  • 通过HOPS介导的融合事件对于促进自细胞成熟至关重要.
  • 从神经元轴突终端开始逆行自体运输,HOPS复合体的功能是必不可少的.
  • 这项研究揭示了HOPS复合体在神经元自中的关键作用,并提供了对HOPS复合体相关的神经退行性疾病的见解.