Abstract
Phosphorylation regulates the function of ligand-gated ion channels such as the N-methyl d-aspartate (NMDA) receptor. Here we report a mechanism for modulation of the phosphorylation state and function of the NMDA receptor via an inhibitory scaffolding protein, RACK1. We found that RACK1 binds both the NR2B subunit of the NMDA receptor and the nonreceptor protein tyrosine kinase, Fyn. RACK1 inhibits Fyn phosphorylation of NR2B and decreases NMDA receptor-mediated currents in CA1 hippocampal slices. Peptides that disrupt the interactions between RACK1, NR2B, and Fyn induce phosphorylation and potentiate NMDA receptor-mediated currents. Therefore, RACK1 is a regulator of NMDA receptor function and may play a role in synaptic plasticity, addiction, learning, and memory.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Animals
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DNA, Complementary / metabolism
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Dose-Response Relationship, Drug
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Electrophysiology
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Escherichia coli / metabolism
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GTP-Binding Proteins
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Gene Expression Regulation*
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Hippocampus / metabolism
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Humans
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Male
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Molecular Sequence Data
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Neoplasm Proteins / metabolism*
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Peptides / chemistry
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Phosphorylation
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Precipitin Tests
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Protein Binding
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Protein Biosynthesis
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Proto-Oncogene Proteins / metabolism
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Proto-Oncogene Proteins c-fyn
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Rats
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Rats, Sprague-Dawley
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Receptors for Activated C Kinase
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Receptors, Cell Surface
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Receptors, N-Methyl-D-Aspartate / metabolism*
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Recombinant Proteins / metabolism
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Two-Hybrid System Techniques
Substances
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DNA, Complementary
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Neoplasm Proteins
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Peptides
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Proto-Oncogene Proteins
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RACK1 protein, human
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Receptors for Activated C Kinase
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Receptors, Cell Surface
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Receptors, N-Methyl-D-Aspartate
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Recombinant Proteins
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FYN protein, human
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Fyn protein, rat
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Proto-Oncogene Proteins c-fyn
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GTP-Binding Proteins