Dynein and Star interact in EGFR signaling and ligand trafficking.

Dynein and Star interact in EGFR signaling and ligand trafficking.
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DOI:
10.1242/jcs.027144
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发表时间:
2008-08-15
影响因子:
4
通讯作者:
Hays, Thomas S.
Hays, Thomas S.
中科院分区:
生物学2区
文献类型:
--
作者:
Iyadurai, Stanley J. P.;Robinson, John T.;Ma, Lingzhi;He, Yungui;Mische, Sarah;Li, Min-gang;Brown, William;Guichard, Annabel;Bier, Ethan;Hays, Thomas S.

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配体的细胞内运输和加工对于激活指导发育的信号转导途径至关重要。 Star 是果蝇中的一个必需基因,与表皮生长因子 (EGF) 受体信号传导配体的运输有关。细胞质马达在内吞和分泌途径中的作用是众所周知的,但马达在EGF受体转运中的具体要求尚未被研究。我们在旨在恢复 Glued 突变 Gl1 的显性粗糙眼表型的第二位点修饰子的筛选中鉴定了 Star。 Glued (Gl) 基因座编码动力蛋白复合物的 p150 亚基,动力蛋白复合物是细胞质动力蛋白驱动运动的激活剂。我们表明,Gl 和动力蛋白的等位基因与 Star 和 EGFR 等位基因在遗传上相互作用。与 Star 突变类似,Gl1 突变能够改变 EGFR 突变 Ellipse 的表型。这些遗传相互作用提出了一个模型,其中 Star、dynactin 和动力蛋白在 EGF 配体的运输中合作。为了支持这一模型,裂解的活性 Spitz 配体的过度表达可以部分绕过有缺陷的运输并抑制遗传相互作用。我们对活 S2 细胞的直接观察表明,Spitz-GFP 从内质网的输出以及 Spitz-GFP 囊泡的运输依赖于 Star 和动力蛋白。
Intracellular transport and processing of ligands is critical to the activation of signal transduction pathways that guide development. Star is an essential gene in Drosophila that has been implicated in the trafficking of ligands for epidermal growth factor (EGF) receptor signaling. The role of cytoplasmic motors in the endocytic and secretory pathways is well known, but the specific requirement of motors in EGF receptor transport has not been investigated. We identified Star in a screen designed to recover second-site modifiers of the dominant rough eye phenotype of the Glued mutation Gl1. The Glued (Gl) locus encodes the p150 subunit of the dynactin complex, an activator of cytoplasmic dynein-driven motility. We show that alleles of Gl and dynein genetically interact with both Star and EGFR alleles. Similarly to mutations in Star, the Gl1 mutation is capable of modifying the phenotypes of the EGFR mutation Ellipse. These genetic interactions suggest a model in which Star, dynactin and dynein cooperate in the trafficking of EGF ligands. In support of this model, overexpression of the cleaved, active Spitz ligand can partially bypass defective trafficking and suppress the genetic interactions. Our direct observations of live S2 cells show that export of Spitz-GFP from the endoplasmic reticulum, as well as the trafficking of Spitz-GFP vesicles, depends on both Star and dynein.
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