Notch ligand endocytosis generates mechanical pulling force dependent on dynamin, epsins, and actin.

Notch ligand endocytosis generates mechanical pulling force dependent on dynamin, epsins, and actin.
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DOI:
10.1016/j.devcel.2012.04.005
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发表时间:
2012-06-12
期刊:
影响因子:
11.8
通讯作者:
Weinmaster, Gerry
Weinmaster, Gerry
中科院分区:
生物学1区
文献类型:
--
作者:
Meloty-Kapella, Laurence;Shergill, Bhupinder;Kuon, Jane;Botvinick, Elliot;Weinmaster, Gerry

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细胞表面配体诱导的Notch信号传导对许多真核生物的发育和维持至关重要。Notch及其配体是促进直接细胞-细胞相互作用以激活Notch蛋白水解并释放指导Notch特异性细胞应答的细胞内结构域的整合膜蛋白。遗传学研究表明,Notch配体需要内吞作用、泛素化和胰蛋白酶内吞衔接子来激活信号传导,但配体内吞作用的确切作用仍然没有得到解决。在这里,我们的特点是一个分子不同的网格蛋白介导的内吞作用的模式,需要配体泛素化,epsins和肌动蛋白的配体细胞激活信号在Notch细胞。使用细胞珠光镊系统,我们获得了细胞介导的机械力依赖于这种独特的配体内吞作用模式的证据。我们建议机械拉力产生的Notch结合配体的内吞驱动器允许激活蛋白水解的Notch的构象变化。
Notch signaling induced by cell surface ligands is critical to development and maintenance of many eukaryotic organisms. Notch and its ligands are integral membrane proteins that facilitate direct cell-cell interactions to activate Notch proteolysis and release the intracellular domain that directs Notch-specific cellular responses. Genetic studies suggest Notch ligands require endocytosis, ubiquitylation and epsin endocytic adaptors to activate signaling, yet the exact role ligand endocytosis serves remains unresolved. Here we characterize a molecularly distinct mode of clathrin-mediated endocytosis requiring ligand ubiquitylation, epsins and actin for ligand cells to activate signaling in Notch cells. Using a cell-bead optical tweezers system, we obtained evidence for cell-mediated mechanical force dependent on this distinct mode of ligand endocytosis. We propose mechanical pulling force produced by endocytosis of Notch-bound ligand drives conformational changes in Notch that permit activating proteolysis.
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