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相关概念视频

Recycling Endosomes and Transcytosis00:58

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The recycling endosome, also known as the endosomal recycling compartment (ERC), is a part of the slow-recycling process of the endocytic pathway. Molecules internalized through receptor-mediated endocytosis are either degraded in the lysosomes or are recycled to the plasma membrane through the fast- or slow-recycling route.
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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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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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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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通过设计的迷你蛋白质有效地逃脱内体细胞的要求.

Jonathan Giudice1, Daniel D Brauer1, Madeline Zoltek2

  • 1Department of Chemistry, University of California, Berkeley, CA 94720.

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概括

通过pH诱导的展开和特定的脂质结合,ZF5.3迷你蛋白有效地逃离了内分体. 这种机制使蛋白质能够有针对性地传递到细胞质或细胞核,这对于治疗应用至关重要.

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科学领域:

  • 生物化学 生物化学
  • 细胞生物学 细胞生物学
  • 蛋白质工程是指蛋白质工程.

背景情况:

  • ZF5.3是一种27氨基酸迷你蛋白质,能够将货物送入细胞核和细胞核.
  • 通过ZF5.3穿越内细胞膜的机制在很大程度上是未知的.
  • 有效的内体体逃生对于将治疗分子传递到细胞内点至关重要.

研究的目的:

  • 描述ZF5.3的属性,使其能够有效地进行内体逃生.
  • 了解pH值,蛋白质稳定性和脂质相互作用在ZF5.3机制中的作用.
  • 为设计新型蛋白质输送系统提供信息.

主要方法:

  • 高分辨率核磁共振 (NMR) 光谱测定ZF5.3结构和pH依赖的展开.
  • 循环二重化 (CD) 光谱法用于评估蛋白质的稳定性.
  • 复制脂质组测定用于研究脂质-蛋白质相互作用.
  • 基于细胞的测试来评估内体体逃脱效率.

主要成果:

  • 在中性和轻微酸性pH值下,ZF5.3是稳定的,但在较低的pH值下,由于Zn(II) 结合的histidine的质子化,它会合作地展开.
  • pH诱导的展开,对于内体逃逸至关重要,与晚期内体光的pH相关.
  • ZF5.3表现出对BMP脂质的高亲和度结合,这种脂质在晚期内体中被丰富,并且在低pH下表现出更强的相互作用.
  • 在pH4.5稳定的ZF5.3模拟显示细胞质递送受损,证实了pH诱导的展开的必要性.

结论:

  • ZF5.3利用pH诱导的展开和特定的脂质相互作用来有效地进行内体逃逸.
  • 五氨基素图案和指折叠被整合到一个α螺旋体中,有助于其稳定性和功能.
  • 了解这些机制为设计治疗应用的基于蛋白质的输送系统提供了一个框架.