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Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

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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Updated: May 7, 2026

Single-molecule Super-resolution Imaging of Phosphatidylinositol 4,5-bisphosphate in the Plasma Membrane with Novel Fluorescent Probes
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在细胞膜上解密单受体二元化

Jin Wang1, Juan Song1, Xian Zhang1

  • 1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

Journal of the American Chemical Society
|January 9, 2023
PubMed
概括

研究人员开发了新的纳米探针,用于实时单分子监测受体氨酸激酶 (RTK) 的二分化. 这一突破使得我们能够精确控制和深入了解细胞信号传递机制.

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科学领域:

  • 生物物理
  • 分子生物学
  • 纳米技术

背景情况:

  • 细胞膜上的受体二分化对于调节细胞活动至关重要.
  • 要了解这些机制,需要对单分子二分化进行长期监测.

研究的目的:

  • 实现对受体氨酸激酶 (RTK) 的实时单分子观察.
  • 允许精确调节和动态监控二度化过程.

主要方法:

  • 使用等离子线索用于单分子水平的RTK观测.
  • 使用DNA编程进行精确的调节和监控.
  • 开发出具有极佳光稳定的纳米探测器.

主要成果:

  • 首次实现RTK二元化的实时单分子观测.
  • 在调节RTK二元化,酸化和下游信号中展示了纳米探针的应用.
  • 展示了对受体交联事件的精确控制.

结论:

  • 拟议的纳米探测器为单受体交联的精确操纵和监测提供了一个新范式.
  • 这些工具可以阐明二元化和构造变化的分子机制.
  • 对细胞信号通路的理解有很大的潜力.