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The Journal of Neuroscience, October 1, 2001, 21(19):7506-7516
Synapse-Associated Protein 97 Selectively Associates with
a Subset of AMPA Receptors Early in their Biosynthetic Pathway
Nathalie
Sans,
Claudia
Racca,
Ronald S.
Petralia,
Ya-Xian
Wang,
Jennifer
McCallum, and
Robert J.
Wenthold
Laboratory of Neurochemistry, National Institute on Deafness and
other Communication Disorders, National Institutes of Health, Bethesda,
Maryland 20892-8027
The regulation of AMPA receptors at the postsynaptic membrane is a
fundamental component of synaptic plasticity. In the hippocampus, the
induction of long-term potentiation increases the delivery of
GluR1, a major AMPA receptor subunit in hippocampal pyramidal neurons,
to the synaptic plasma membrane through a mechanism that requires the
PDZ binding domain of GluR1. Synapse-associated protein 97 (SAP97), a member of the membrane-associated guanylate kinase family, is believed to associate with AMPA receptors (AMPARs) containing the GluR1 subunit, but the functional significance of these
interactions is unclear. We investigated the interaction of GluR1 with
SAP97, the only PDZ protein known to interact with GluR1. We find that
interactions involving SAP97 and GluR1 occur early in the secretory
pathway, while the receptors are in the endoplasmic reticulum or
cis-Golgi. In contrast, few synaptic receptors associate
with SAP97, suggesting that SAP97 dissociates from the receptor complex
at the plasma membrane. We also show that internalization of GluR1, as
triggered by NMDAR activation, does not require SAP97. These results
implicate GluR1-SAP97 interactions in mechanisms underlying AMPA
receptor targeting.
Key words:
SAP97; GluR1; trafficking; ER-cis-Golgi; postsynaptic density; hippocampus
Copyright © 2001 Society for Neuroscience 0270-6474/01/21197506-11$05.00/0
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