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Homer as both a scaffold and transduction molecule
Laurent Fagni1, Paul F Worley, Fabrice Ango
1UPR CNRS 9023, CCIPE, 141 Rue de la Cardonille, 34094 Montpellier, France. fagni@montp.inserm.fr
Summary
Homer proteins are crucial scaffolds in neurons, organizing glutamate receptors at postsynaptic sites. They significantly influence receptor function and intracellular calcium signaling, with different isoforms having varied effects.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Scaffold proteins regulate receptor and channel membrane assembly.
- Homer proteins are key scaffolds binding protein clusters and glutamate receptors at postsynaptic sites.
Purpose of the Study:
- To review cloning and gene expression of the Homer protein family.
- To summarize the roles of Homer proteins in neuronal glutamate receptor function and intracellular signaling.
Main Methods:
- Literature review of studies on Homer protein cloning and gene expression.
- Analysis of existing data on Homer protein interactions with glutamate receptors.
Main Results:
- Homer proteins localize metabotropic glutamate receptor subtype 5 (mGlu5 receptor) to the postsynaptic plasma membrane.
- Homer proteins modulate intracellular Ca2+ response kinetics and amplitude for mGlu1 and mGlu5 receptors.
- Homer protein isoforms differentially regulate spontaneous receptor activation.
Conclusions:
- Homer proteins play a critical role in organizing postsynaptic structures and modulating glutamatergic signaling.
- The diverse functions of Homer proteins highlight their importance in neuronal communication and plasticity.