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Small GTPases. 2012 Jul-Sep;3(3):186-91. doi: 10.4161/sgtp.19802. Epub 2012 Jul 1.

Ral inhibits ligand-independent Notch signaling in Drosophila.

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1
Section of Molecular Cell and Developmental Biology, Institute for Cell and Molecular Biology, The University of Texas at Austin, Austin, TX, USA.

Abstract

We discovered recently that the Drosophila Ral GTPase regulates Notch signaling and thereby affects cell patterning in the eye. Although Ral functions in the ligand signaling cells, Ral does not stimulate ligand signaling directly. Rather, in cells that express both Notch receptor and ligand, Ral activity promotes a cell to become the signaler by inhibiting Notch receptor activation in that cell. Moreover, Ral inhibits a particular pathway of Notch activation-receptor activation that occurs independent of ligand binding. In this Commentary, we discuss the phenomenon of ligand-independent Notch receptor activation and how this event might be regulated by Ral.

PMID:
22750761
PMCID:
PMC3442807
DOI:
10.4161/sgtp.19802
[Indexed for MEDLINE]
Free PMC Article
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