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相关概念视频

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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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 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
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A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
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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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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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相关实验视频

Updated: Mar 14, 2026

Author Spotlight: Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos
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Author Spotlight: Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos

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通过desmoplakin,RhoGEF Ect2支持在细胞-细胞结处的RhoA活性.

Hoda Zarkoob1, Chen Y Kam1, Jennifer L Koetsier1

  • 1Department of Pathology, Northwestern Feinberg School of Medicine, Chicago, IL, USA.

Life science alliance
|March 12, 2026
PubMed
概括
此摘要是机器生成的。

德斯莫普拉金 (DP) 将中间丝连接到细胞结点,保持组织完整性. 我们发现DP将Ect2招募到这些结点,调节RhoA活动并影响心皮健康.

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Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein GST-RhoAG17A from Epithelial Cell Lysates
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Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein GST-RhoAG17A from Epithelial Cell Lysates

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RhoC GTPase Activation Assay
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Author Spotlight: Optogenetic Inhibition of Rho1-Mediated Actomyosin Contractility Coupled with Measurement of Epithelial Tension in Drosophila Embryos

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Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein GST-RhoAG17A from Epithelial Cell Lysates
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RhoC GTPase Activation Assay
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RhoC GTPase Activation Assay

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科学领域:

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

背景情况:

  • 德斯莫普拉金 (DP) 是一种关键的德斯莫体蛋白质,对组织机械完整性至关重要.
  • DP中的突变与各种心皮综合征有关,突出显示了它在结构支持之外的作用.
  • 新出现的证据表明DP功能作为一个信号中心,影响细胞过程.

研究的目的:

  • 在细胞间连接处识别desmoplakin的新型相互作用伙伴.
  • 为了研究desmoplakin和actin细胞骨架的调节器之间的功能关系.
  • 探索心皮综合征中德斯莫普拉金突变的致病机制.

主要方法:

  • 免疫光显微镜可视化蛋白质局部化在角质细胞和心肌细胞.
  • 同免疫沉测试以确认蛋白质与蛋白质相互作用.
  • 生物化学测定测量RhoA活动.
  • 对患有德斯莫普拉金突变的患者衍生细胞的分析.

主要成果:

  • 确定了RhoGEF Ect2作为一种新型的desmoplakin相关蛋白在desmosomes和间接盘.
  • 德斯莫普拉金促进了Ect2局部化,并在细胞结处保持活跃的RhoA (Rho-GTP).
  • 在心脏肌细胞中,PKC以德斯莫普拉金依赖的方式调节ECT2活动.
  • 在卡瓦哈尔综合征中发现的一种截断的德斯莫普拉金突变会损害Ect2结合和局部化.

结论:

  • 德斯莫普拉金与RhoGEF Ect2相互作用并将其招募到细胞结点,调节RhoA信号传递.
  • 这种相互作用对于维护脱体和间接盘的完整性至关重要.
  • 由于突变导致的德斯莫普拉金-Ect2相互作用受损,有助于心皮综合征的发病.