Regulation of cargo-selective endocytosis by dynamin 2 GTPase-activating protein girdin.

Regulation of cargo-selective endocytosis by dynamin 2 GTPase-activating protein girdin.
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DOI:
10.15252/embj.201488289
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发表时间:
2014-09-17
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Takahashi M
Takahashi M
中科院分区:
其他
文献类型:
--
作者:
Weng L;Enomoto A;Miyoshi H;Takahashi K;Asai N;Morone N;Jiang P;An J;Kato T;Kuroda K;Watanabe T;Asai M;Ishida-Takagishi M;Murakumo Y;Nakashima H;Kaibuchi K;Takahashi M

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在网格蛋白介导的内吞作用(CME)中,对货物的特异性和选择性被认为是由货物特异性衔接子严格调节的,用于不同的细胞功能。在这里,我们表明,肌动蛋白结合蛋白girdin是货物选择性CME的调节。Girdin与发动蛋白2相互作用,发动蛋白2是一种从质膜切除内吞囊泡的GTP酶,并作为其GTP酶激活蛋白发挥作用。有趣的是,网格蛋白缺失导致细胞中心网格蛋白包被的小凹形成缺陷。此外,我们发现,girdin差异与一些货物,竞争性地阻止girdin与发动蛋白2相互作用,并赋予CME的货物选择性。因此,girdin调节转铁蛋白和E-钙粘蛋白的细胞内吞作用的中心和随后的极化细胞内定位,但没有影响整合素和表皮生长因子受体的内吞作用,发生在细胞周边。我们的研究结果表明,girdin调节选择性CME通过机制,涉及发动蛋白2,但不是作为一个货物特定的适配器。
In clathrin-mediated endocytosis (CME), specificity and selectivity for cargoes are thought to be tightly regulated by cargo-specific adaptors for distinct cellular functions. Here, we show that the actin-binding protein girdin is a regulator of cargo-selective CME. Girdin interacts with dynamin 2, a GTPase that excises endocytic vesicles from the plasma membrane, and functions as its GTPase-activating protein. Interestingly, girdin depletion leads to the defect in clathrin-coated pit formation in the center of cells. Also, we find that girdin differentially interacts with some cargoes, which competitively prevents girdin from interacting with dynamin 2 and confers the cargo selectivity for CME. Therefore, girdin regulates transferrin and E-cadherin endocytosis in the center of cells and their subsequent polarized intracellular localization, but has no effect on integrin and epidermal growth factor receptor endocytosis that occurs at the cell periphery. Our results reveal that girdin regulates selective CME via a mechanism involving dynamin 2, but not by operating as a cargo-specific adaptor.
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