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Directional Delta And Notch Trafficking In Sara Endosomes During Asymmetric Cell Division

机译:在不对称细胞分裂过程中萨拉内体的方向性三角洲和缺口贩运。

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摘要

Endocytosis has a crucial role during Notch signalling after the asymmetric division of fly sensory organ precursors (SOPs): directional signalling is mediated by differential endocytosis of the ligand Delta and the Notch effector Sanpodo in one of the SOP daughters, pIIb. Here we show a new mechanism of directional signalling on the basis of the trafficking of Delta and Notch molecules already internalized in the SOP and subsequently targeted to the other daughter cell, pIIa. Internalized Delta and Notch traffic to an endosome marked by the protein Sara. During SOP mitosis, Sara endosomes containing Notch and Delta move to the central spindle and then to pIIa. Subsequently, in pIIa (but not in pIIb) Notch appears cleaved in Sara endosomes in a γ-secretase- and Delta internalization-dependent manner, indicating that the release of the intracellular Notch tail to activate Notch target genes has occurred. We thus uncover a new mechanism to bias signalling even before asymmetric endocytosis of Sanpodo and Delta takes place in the daughter cells: already during SOP mitosis, asymmetric targeting of Delta and Notch-containing Sara endosomes will increase Notch signalling in pIIa and decrease it in pIIb.
机译:内吞作用在果蝇感觉器官前体(SOP)不对称分裂后的Notch信号传导中起着至关重要的作用:定向信号是由SOP子代pIIb中的配体Delta和Notch效应子Sanpodo的不同内吞作用介导的。在这里,我们基于已经在SOP中内化并随后靶向另一个子细胞pIIa的Delta和Notch分子的运输,显示了定向信号传导的新机制。内部化的Delta和Notch转运至以蛋白质Sara标记的内体。在SOP有丝分裂期间,包含Notch和Delta的Sara内体移动到中心纺锤,然后移动到pIIa。随后,在pIIa中(而不在pIIb中),Notch在Sara内体中以γ-分泌酶和Delta内化依赖性方式被切割,表明已经释放了细胞内Notch尾巴以激活Notch靶基因。因此,我们甚至在子细胞发生Sanpodo和Delta的不对称内吞之前发现了一种偏向信号转导的新机制:在SOP有丝分裂期间,不对称靶向Delta和含Notch的Sara内体将增加pIIa中的Notch信号传导,并降低pIIb中的Notch信号传导。 。

著录项

  • 来源
    《Nature》 |2009年第7241期|p.1051-1055|共5页
  • 作者单位

    Departments of Biochemistry and Molecular Biology, University of Geneva, 30 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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