GRIP1 Binds to ApoER2 and EphrinB2 to Induce Activity-Dependent AMPA Receptor 
Insertion at the Synapse

Pfennig, S.; Foss, F.; Bissen, D.; Harde, E.; Treeck, J. C.; Segarra, M.; Acker-Palmer, Amparo

doi:10.1016/j.celrep.2017.09.019

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GRIP1 Binds to ApoER2 and EphrinB2 to Induce Activity-Dependent AMPA Receptor Insertion at the Synapse

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Acker-Palmer, Amparo
Neurovascular interface Group, Max Planck Institute for Brain Research, Max Planck Society;

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https://www.ncbi.nlm.nih.gov/pubmed/28978486
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Citation

Pfennig, S., Foss, F., Bissen, D., Harde, E., Treeck, J. C., Segarra, M., et al. (2017). GRIP1 Binds to ApoER2 and EphrinB2 to Induce Activity-Dependent AMPA Receptor Insertion at the Synapse. Cell Rep., 21(1), 84-96. doi:10.1016/j.celrep.2017.09.019.

Cite as: https://hdl.handle.net/21.11116/0000-0008-0C2A-D

Abstract

Regulation of alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor trafficking in response to neuronal activity is critical for synaptic function and plasticity. Here, we show that neuronal activity induces the binding of ephrinB2 and ApoER2 receptors at the postsynapse to regulate de novo insertion of AMPA receptors. Mechanistically, the multi-PDZ adaptor glutamate-receptor-interacting protein 1 (GRIP1) binds ApoER2 and bridges a complex including ApoER2, ephrinB2, and AMPA receptors. Phosphorylation of ephrinB2 in a serine residue (Ser-9) is essential for the stability of such a complex. In vivo, a mutation on ephrinB2 Ser-9 in mice results in a complete disruption of the complex, absence of ApoER2 downstream signaling, and impaired activity-induced and ApoER2-mediated AMPA receptor insertion. Using compound genetics, we show the requirement of this complex for long-term potentiation (LTP). Together, our findings uncover a cooperative ephrinB2 and ApoER2 signaling at the synapse, which serves to modulate activity-dependent AMPA receptor dynamic changes during synaptic plasticity.