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相关概念视频

The Ras Gene02:38

The Ras Gene

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The Ras-gene-encoded proteins are regulators of signaling pathways controlling cell proliferation, differentiation, or cell survival. The Ras-gene family in humans constitutes three primary members—the HRas, NRas, and KRas. These genes code for four functionally distinct yet closely related proteins—the HRas, NRas, KRas4A, and KRas4B. The involvement of mutant Ras genes in human cancer was first discovered in 1982 and is among the most common causes of human tumorigenesis.
Ras is a...
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Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
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Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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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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Rab Proteins01:14

Rab Proteins

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Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
Rab proteins switch between a cytosolic, GDP-bound inactive state and a membrane-anchored, GTP-bound active state. By themselves, Rabs show slow rates of GDP/GTP exchange and GTP hydrolysis. Thus, Rab proteins are considered...
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Cell Motility through Blebbing01:16

Cell Motility through Blebbing

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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
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相关实验视频

Updated: Jun 4, 2025

Automated Imaging and Analysis for the Quantification of Fluorescently Labeled Macropinosomes
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Automated Imaging and Analysis for the Quantification of Fluorescently Labeled Macropinosomes

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基于激发性Ras动态的屏幕显示,RasGEFX对于巨型皮诺细胞形成和随机细胞迁移是必要的.

Koji Iwamoto1, Satomi Matsuoka2,3,4, Masahiro Ueda5,6

  • 1Laboratory of Single Molecule Biology, Graduate School of Science and Graduate School of Frontier Biosciences, Osaka University, 1-3 Yamadaoka, Suita, Osaka, 565-0871, Japan.

Nature communications
|January 2, 2025
PubMed
概括
此摘要是机器生成的。

研究人员在Dictyostelium discoideum中确定了控制自发细胞迁移和巨细胞形成的关键RasGEF蛋白. RasGEFX对于启动Ras-GTP信号传递至关重要,这对于细胞运动和营养吸收至关重要.

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科学领域:

  • 细胞生物学 细胞生物学
  • 生物化学 生物化学
  • 分子生物学分子生物学

背景情况:

  • 细胞表现出化学反应,使其能够有定向的运动.
  • 拉斯-GTP域的自发信号驱动随机细胞迁移.
  • 产生这些自发信号的特定分子以前是未知的.

研究的目的:

  • 确定负责Dictyostelium discoideum中自发Ras-GTP域生成的Ras关氨酸核酸交换因子 (RasGEFs).
  • 阐明各种RasGEFs在调节细胞迁移和巨细胞形成中的不同作用.

主要方法:

  • 活细胞对Ras-GTP的时间空间动态进行成像.
  • 信号动态的等级集群分析.
  • 在Dictyostelium discoideum中RasGEF表达的基因操纵.

主要成果:

  • RasGEFX对于Ras-GTP域的自发生成和饥饿细胞中的随机细胞迁移至关重要,与RasGEFB/M/U一起工作.
  • RasGEFX和RasGEFB调节Ras-GTP波的时间和空间方面,影响细胞突起.
  • RasGEFU和RasGEFM分别控制细胞粘附和迁移速度.
  • RasGEFX在增殖细胞中独特地支持Ras/PIP3驱动的巨细胞形成.

结论:

  • 多个RasGEFs协调控制细胞骨动力学自发运动.
  • RasGEFs在调节细胞迁移,粘附和巨细胞形成方面发挥着独特的作用.
  • RasGEFX是自发迁移和巨细胞形成的关键调节剂.