Abstract
A synaptic pool of extracellular signal-regulated kinases (ERK) controls synaptic transmission, although little is known about its underlying signaling mechanisms. Here, we found that synaptic ERK2 directly binds to postsynaptic metabotropic glutamate receptor 1a (mGluR1a). This binding is direct and the ERK-binding site is located in the intracellular C-terminus (CT) of mGluR1a. Parallel with this binding, ERK2 phosphorylates mGluR1a at a cluster of serine residues in the distal part of mGluR1a-CT. In rat cerebellar neurons, ERK2 interacts with mGluR1a at synaptic sites, and active ERK constitutively phosphorylates mGluR1a under normal conditions. This basal phosphorylation is critical for maintaining adequate surface expression of mGluR1a. ERK is also essential for controlling mGluR1a signaling in triggering distinct postreceptor signaling transduction pathways. In summary, we have demonstrated that mGluR1a is a sufficient substrate of ERK2. ERK that interacts with and phosphorylates mGluR1a is involved in the regulation of the trafficking and signaling of mGluR1.
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Acknowledgments
The authors thank Drs. Minglei Guo and Bing Xue for technical assistance. This work was supported by NIH grants DA10355 (J.Q.W.) and MH61469 (J.Q.W.), the NRF grants 2013R1A2A2A04016044 (E.S.C.) and 2015R1A5A7037508 (E.S.C.), and the MFDS 14182MFDS977 (E.S.C.), South Korea.
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Ju Hwan Yang and Li-Min Mao equally contributed to this work.
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Yang, J.H., Mao, LM., Choe, E.S. et al. Synaptic ERK2 Phosphorylates and Regulates Metabotropic Glutamate Receptor 1 In Vitro and in Neurons. Mol Neurobiol 54, 7156–7170 (2017). https://doi.org/10.1007/s12035-016-0225-4
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DOI: https://doi.org/10.1007/s12035-016-0225-4