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
影响因子:
11.8
通讯作者:
Schupbach, Trudi
中科院分区:
文献类型:
--
作者:
Yan, Yan;Denef, Natalie;Schupbach, Trudi
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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影响因子:
11.8
作者:
Denef, Natalie;Chen, Yu;Schupbach, Trudi
通讯作者:
Schupbach, Trudi
影响因子:
9.2
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影响因子:
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