1. Notch interferes with the scaffold function of JNK-interacting protein 1 to inhibit the JNK signaling pathway
- Author
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Hee Jae Yun, Eui Ju Choi, Jin Woo Kim, Tong Shin Chang, Myung Jin Kim, Hee Sae Park, Pyung Lim Han, Ji Soo Chae, Kang Woo Lee, Ssang-Goo Cho, Sang Gil Hwang, Kwang Je Kim, and Tae-Wan Kim
- Subjects
Genetic Vectors ,Immunoblotting ,Apoptosis ,Biology ,Cell fate determination ,Cell Line ,Serrate-Jagged Proteins ,Calcium-binding protein ,Animals ,Humans ,Immunoprecipitation ,Receptor, Notch1 ,Luciferases ,Adaptor Proteins, Signal Transducing ,Multidisciplinary ,Kinase ,Cell growth ,Calcium-Binding Proteins ,JNK Mitogen-Activated Protein Kinases ,Signal transducing adaptor protein ,Membrane Proteins ,Biological Sciences ,Cell biology ,Protein Structure, Tertiary ,Glucose ,Jagged-1 Protein ,Intercellular Signaling Peptides and Proteins ,Signal transduction ,Protein Binding ,Signal Transduction - Abstract
The transmembrane protein Notch is cleaved by γ-secretase to yield an active form, Notch intracellular domain (Notch-IC), in response to the binding of ligands, such as Jagged. Notch-IC contributes to the regulation of a variety of cellular events, including cell fate determination during embryonic development as well as cell growth, differentiation, and survival. We now show that Notch1-IC suppresses the scaffold activity of c-Jun N-terminal kinase (JNK)-interacting protein 1 (JIP1) in the JNK signaling pathway. Notch1-IC physically associated with the JNK binding domain of JIP1 and thereby interfered with the interaction between JIP1 and JNK. JIP1 mediated the activation of JNK1 induced by glucose deprivation in mouse embryonic fibroblasts, and ectopic expression of Notch1-IC inhibited JNK activation and apoptosis triggered by glucose deprivation. Taken together, these findings suggest that Notch1-IC negatively regulates the JNK pathway by disrupting the scaffold function of JIP1.
- Published
- 2005