The notch intracellular domain can function as a coactivator for LEF-1

Molecular and Cellular Biology
D A Ross, T Kadesch

Abstract

Notch signaling commences with two ligand-mediated proteolysis events that release the Notch intracellular domain, NICD, from the plasma membrane. NICD then translocates into the nucleus and interacts with the DNA binding protein CSL to activate transcription. We found that NICD expression also potentiates activity of the transcription factor LEF-1. NICD stimulation of LEF-1 activity was context dependent and occurred on a subset of promoters distinct from those activated by beta-catenin. Importantly, the effect of NICD does not appear to be mediated through canonical components of the Wnt signaling pathway or downstream components of the Notch pathway. In vitro assays show a weak association between the C-terminal transactivation domain of NICD and the high-mobility group domain of LEF-1, suggesting that the two proteins interact in vivo. Our data therefore describe a new nuclear target of Notch signaling and a new coactivator for LEF-1.

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