Ligand-induced Cleavage and Regulation of Nuclear Entry of Notch in Drosophila Melanogaster Embryos

Overview

Journal Genes Dev

Specialty Molecular Biology

Date 1998 Dec 16

PMID 9851979

Citations 75

Authors

S Kidd

T Lieber

M W YOUNG

Affiliations

Soon will be listed here.

Abstract

Notch, a transmembrane protein found in a wide range of organisms, is a component of a pathway that mediates cell-fate decisions that involve intercellular communication. In this paper, we show that in Drosophila melanogaster, Notch (N) is processed in a ligand-dependent fashion to generate phosphorylated, soluble intracellular derivatives. Suppressor of Hairless [Su(H)] is predominantly associated with soluble intracellular N. It has been demonstrated by others that N has access to the nucleus, and we show that when tethered directly to DNA, the cytoplasmic domain of N can activate transcription. Conversely, a viral activator fused to Su(H) can substitute for at least some N functions during embryogenesis. We suggest that one function of soluble forms of N is to bind to Su(H), and in the nucleus, to act directly as a transcriptional transactivator of the latter protein. Although N has functional nuclear localization signals, the N/Su(H) complex accumulates in the cytoplasm and on membranes suggesting that its nuclear entry is regulated. Localization studies in cultured cells and embryos suggest that Su(H) plays a role in this regulation, with the relative levels of Delta, N and Su(H) determining whether a N/Su(H) complex enters the nucleus.

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