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Identification of Nore1 as a potential Ras effector
1The Diabetes Unit and Medical Services and the Department of Medicine, Harvard Medical School, Massachusetts General Hospital East, Charlestown, Massachusetts 02129, USA.
The Journal of Biological Chemistry
|April 16, 1998
Summary
Researchers discovered Nore1, a novel protein that interacts with the Ras GTP-binding protein. This interaction is crucial for transmitting growth and differentiation signals from cell surface receptors in mammalian cells.
Area of Science:
- Cellular signaling
- Molecular biology
- Protein-protein interactions
Background:
- Ras GTP-binding protein is central to signal transduction pathways.
- Ras mediates signals from cell surface receptors to intracellular pathways via effectors.
Purpose of the Study:
- Identify novel Ras effectors or targets.
- Characterize the interaction between Ras and the newly identified protein, Nore1.
Main Methods:
- In vitro binding assays to test Ras-Nore1 interaction.
- In situ association studies in mammalian cells (COS-7, KB) following receptor activation.
Main Results:
- Identified Nore1, a novel protein with no sequence similarity to known proteins and lacking a catalytic domain.
- Demonstrated direct, GTP-dependent interaction between Nore1 and Ras in vitro.
- Showed Nore1 associates with Ras in cells upon epidermal growth factor receptor activation.
Conclusions:
- Nore1 is a novel Ras effector or target.
- Nore1's interaction with Ras is dependent on Ras's effector domain and GTP-binding state.
- Nore1 is involved in Ras-mediated signaling downstream of growth factor receptors.