PUBLICATION

Identification of a Paralog-Specific Notch1 Intracellular Domain Degron

Authors
Broadus, M.R., Chen, T.W., Neitzel, L.R., Ng, V.H., Jodoin, J.N., Lee, L.A., Salic, A., Robbins, D.J., Capobianco, A.J., Patton, J.G., Huppert, S.S., Lee, E.
ID
ZDB-PUB-160524-5
Date
2016
Source
Cell Reports   15(9): 1920-9 (Journal)
Registered Authors
Patton, James G.
Keywords
none
MeSH Terms
  • Amino Acid Sequence
  • Animals
  • Cell Extracts
  • Embryo, Nonmammalian/metabolism
  • F-Box Proteins/metabolism
  • HEK293 Cells
  • Humans
  • Muscle Proteins/metabolism
  • Mutation/genetics
  • Protein Binding
  • Protein Domains
  • Protein Stability
  • Proteolysis*
  • Receptor, Notch1/chemistry*
  • Receptor, Notch1/metabolism*
  • Regulatory Sequences, Nucleic Acid/genetics
  • Sequence Homology, Amino Acid*
  • Transcription, Genetic
  • Ubiquitin-Protein Ligases/metabolism
  • Xenopus
  • Zebrafish/embryology
PubMed
27210761 Full text @ Cell Rep.
Abstract
Upon Notch pathway activation, the receptor is cleaved to release the Notch intracellular domain (NICD), which translocates to the nucleus to activate gene transcription. Using Xenopus egg extracts, we have identified a Notch1-specific destruction signal (N1-Box). We show that mutations in the N1-Box inhibit NICD1 degradation and that the N1-Box is transferable for the promotion of degradation of heterologous proteins in Xenopus egg extracts and in cultured human cells. Mutation of the N1-Box enhances Notch1 activity in cultured human cells and zebrafish embryos. Human cancer mutations within the N1-Box enhance Notch1 signaling in transgenic zebrafish, highlighting the physiological relevance of this destruction signal. We find that binding of the Notch nuclear factor, CSL, to the N1-Box blocks NICD1 turnover. Our studies reveal a mechanism by which degradation of NICD1 is regulated by the N1-Box to minimize stochastic flux and to establish a threshold for Notch1 pathway activation.
Genes / Markers
Figures
Show all Figures
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Antibodies
Orthology
Engineered Foreign Genes
Mapping