Related Experiment Videos
A candidate target for G protein action in brain.
L T Chen1, A G Gilman, T Kozasa
1Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75235-9041, USA.
The Journal of Biological Chemistry
|September 10, 1999
Summary
Researchers discovered GRIN1, a novel brain protein that interacts with G proteins like G(z)alpha. This protein, along with GRIN2, influences neurite outgrowth, suggesting a role in neural development.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- G proteins are key regulators of cellular signaling pathways.
- G(z)alpha is a specific type of G protein involved in cellular processes.
- Understanding novel effector proteins is crucial for deciphering complex signaling networks.
Purpose of the Study:
- To identify novel effector candidates for G protein signaling.
- To characterize the interaction of GRIN1 with specific G proteins.
- To investigate the role of GRIN1 and GRIN2 in neurite growth.
Main Methods:
- cDNA expression library screening using phosphorylated GTPgammaS-G(z)alpha.
- Protein binding assays to determine interactions with activated G proteins (G(z)alpha, G(o)alpha, G(i)alpha).
- Coexpression studies in Neuro2a cells to observe effects on neurite morphology.
Main Results:
- Identification of GRIN1 as a novel G protein effector.
- GRIN1 binds specifically to activated G(z)alpha, G(o)alpha, and G(i)alpha via its carboxyl terminus.
- GRIN1 and the homologous protein GRIN2 bind activated G(o)alpha and are enriched in neurite growth cones.
- Coexpression of GRIN1/GRIN2 with G(o)alpha induces fine process network formation in Neuro2a cells.
Conclusions:
- GRIN1 is a novel effector protein for G protein signaling, particularly interacting with G(o)alpha.
- GRIN1 and GRIN2, in conjunction with G(o)alpha, play a role in controlling neurite outgrowth.
- These findings suggest a downstream pathway involving G(o)alpha that regulates neural development.