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相关概念视频

GPCR Desensitization01:12

GPCR Desensitization

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G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
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Receptor-mediated Endocytosis01:20

Receptor-mediated Endocytosis

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Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
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GPI Anchoring of Proteins in the ER Membrane01:29

GPI Anchoring of Proteins in the ER Membrane

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GPI-anchoring is a post-translational, reversible protein modification that is ubiquitous in eukaryotes. Such proteins are primarily present on the exoplasmic leaflet of the plasma membrane.
GPI-anchor structure
A sequence of 11 enzymatic reactions results in the synthesis of the complete GPI anchor consisting of a hydrophobic and a hydrophilic portion. The hydrophobic portion comprises phosphatidylinositol, while the hydrophilic part comprises polar groups like phosphoethanolamine,...
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Directing Proteins to the Rough Endoplasmic Reticulum01:34

Directing Proteins to the Rough Endoplasmic Reticulum

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The organelle-specific signaling sequences direct proteins synthesized in the cytosol to their final destination like ER, mitochondria, peroxisomes, etc. Some of the proteins directed to ER are then trafficked via vesicles to other organelles within the cell or the extracellular environment through the Golgi complex. For example, the rough ER synthesizes soluble proteins for transportation to the lysosomes or secretion out of the cell. It can also synthesize transmembrane proteins that can...
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The Early Endosome: Endocytosis of Transferrin01:28

The Early Endosome: Endocytosis of Transferrin

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Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
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Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR...
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Imaging G-protein Coupled Receptor GPCR-mediated Signaling Events that Control Chemotaxis of Dictyostelium Discoideum
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内基因组定位坐标空间选择性的GPCR信号传递.

Blair K A Willette1, Jin-Fan Zhang2,3, Jin Zhang2,3,4

  • 1Department of Pharmacology and Cancer Biology, Duke University, Durham, NC, USA.

Nature chemical biology
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概括

G蛋白结合受体 (GPCRs) 根据它们的位置启动不同的细胞反应. 这项研究揭示了含有GPCR的内分体的物理定位,而不仅仅是它们的生物化学,对于分隔信号传递至关重要.

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科学领域:

  • 细胞生物学 细胞生物学
  • 分子药理学分子药理学
  • 生物物理学的生物物理.

背景情况:

  • G蛋白结合受体 (GPCRs) 根据其亚细胞局部表现出功能多样性.
  • 之前的研究重点是生物化学调节细分的GPCR信号.
  • 物理受体定位在GPCR信号传递中的作用仍未得到充分探索.

研究的目的:

  • 为了研究含有受体的内体的生物物理定位作为隔离GPCR信号传递的机制.
  • 开发用于操纵内分体定位和测量下游信号的方法.
  • 阐明内分体局部化在GPCR介导的转录反应中的作用.

主要方法:

  • 开发了一种方法,在不改变生物化学成分的情况下,在完整的细胞中快速和选择性地重新分配含有受体的内分泌体.
  • 利用两个互补的光学读数来测量单细胞分辨率的GPCR/循环AMP (cAMP) 依赖转录信号.
  • 评估了批量和基因特异性信号响应.

主要成果:

  • 原生内分泌体定位的破坏显著抑制了内分泌体依赖的转录反应.
  • 证明内分体局部化是启动空间选择性GPCR信号传递的关键因素.
  • 确定了基酶 (PDE) 介导的cAMP水解和局部蛋白激酶A (PKA) 活性的机制性作用.

结论:

  • 内分体定位是空间选择性GPCR信号传递的主要媒介.
  • 含有受体的内分体的生物物理定位代表了GPCR功能的新型调节机制.
  • 这一发现提供了超越生物化学调节的新视角,以了解细分的GPCR信号.