The vacuolar proton pump, V-ATPase, is required for notch signaling and endosomal trafficking in Drosophila.

The vacuolar proton pump, V-ATPase, is required for notch signaling and endosomal trafficking in Drosophila.
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DOI:
10.1016/j.devcel.2009.07.001
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发表时间:
2009-09
期刊:
影响因子:
11.8
通讯作者:
Schupbach, Trudi
Schupbach, Trudi
中科院分区:
生物学1区
文献类型:
--
作者:
Yan, Yan;Denef, Natalie;Schupbach, Trudi

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我们已经确定 Rabconnectin-3 α 和 β(Rbcn-3A 和 B)是果蝇中 Notch 信号传导的两个调节因子。我们发现,除了破坏 Notch 信号传导外,Rbcn-3A 和 B 的突变还会导致内吞运输缺陷,其中 Notch 和其他膜蛋白在晚期内体区室中积累。我们发现,Notch 被转运到突变细胞的表面,并且信号在 S2 裂解后被破坏。有趣的是,Rbcn-3A 的酵母同源物 Rav1 调节负责酸化细胞内细胞器的 V-ATP 酶质子泵。我们发现,类似地,Rbcn-3A 和 B 似乎调节 V-ATP 酶功能。此外,我们鉴定了 VhaAC39(一种 V-ATP 酶亚基)中的突变体,并表明它们具有 Rbcn-3A 和 Rbcn-3B 突变体的表型。我们的结果表明,Rbcn-3 通过调节 V-ATP 酶功能影响 Notch 信号传导和运输,这意味着接收细胞中细胞内区室的酸化对于信号传导至关重要。
We have identified Rabconnectin-3 alpha and beta (Rbcn-3A and B) as two regulators of Notch signaling in Drosophila. We found that, in addition to disrupting Notch signaling, mutations in Rbcn-3A and B cause defects in endocytic trafficking, where Notch and other membrane proteins accumulate in late endosomal compartments. We show that Notch is transported to the surface of mutant cells and that signaling is disrupted after the S2 cleavage. Interestingly, the yeast homolog of Rbcn-3A, Rav1, regulates the V-ATPase proton pump responsible for acidifying intracellular organelles. We found that, similarly, Rbcn-3A and B appear to regulate V-ATPase function. Moreover, we identified mutants in VhaAC39, a V-ATPase subunit, and showed that they phenocopy Rbcn-3A and Rbcn-3B mutants. Our results demonstrate that Rbcn-3 affects Notch signaling and trafficking through regulating V-ATPase function, which implies that the acidification of an intracellular compartment in the receiving cells is crucial for signaling.
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