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RESEARCH PRODUCT

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

Sylvia PfennigDiane BissenDiane BissenMarta SegarraJulia C. TreeckFranziska FossFranziska FossAmparo Acker-palmerAmparo Acker-palmerAmparo Acker-palmerEva HardeEva Harde

subject

0301 basic medicineLong-Term PotentiationPrimary Cell CultureEphrin-B2Mice TransgenicNerve Tissue ProteinsephrinBAMPA receptorGRIP1BiologyHippocampusArticleApoER2General Biochemistry Genetics and Molecular BiologyPostsynapseMice03 medical and health sciences0302 clinical medicineddc:570SerineAnimalsReceptors AMPAPhosphorylationAMPA receptorsLong-term depressionlcsh:QH301-705.5LDL-Receptor Related ProteinsAdaptor Proteins Signal TransducingNeuronssynaptic plasticitySynaptic scalingLong-term potentiationCell biologyProtein Transport030104 developmental biologyGene Expression Regulationlcsh:Biology (General)nervous systemSynapsesSilent synapseSynaptic plasticityLTP030217 neurology & neurosurgeryIon channel linked receptorsProtein BindingSignal Transduction

description

Summary Regulation of α-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.

https://doi.org/10.1016/j.celrep.2017.09.019