Analysis of the potential role of GluA4 carboxyl-terminus in PDZ interactions.

Coleman, S.K., Cai, C., Kalkkinen, N., Korpi, E.R. and Keinänen, K. 2010. Analysis of the potential role of GluA4 carboxyl-terminus in PDZ interactions. PLoS ONE. 5 (1) e8715. https://doi.org/10.1371/journal.pone.0008715

TitleAnalysis of the potential role of GluA4 carboxyl-terminus in PDZ interactions.
TypeJournal article
AuthorsColeman, S.K., Cai, C., Kalkkinen, N., Korpi, E.R. and Keinänen, K.
Abstract

Background
Specific delivery to synapses of α-amino-3-hydroxy-5-methylisoxazole-4-propionate (AMPA) receptors with long-tailed subunits is believed to be a key event in many forms of activity-dependent changes in synaptic strength. GluA1, the best characterized long-tailed AMPA receptor subunit, contains a C-terminal class I PDZ binding motif, which mediates its interaction with scaffold and trafficking proteins, including synapse-associated protein 97 (SAP97). In GluA4, another long-tailed subunit implicated in synaptic plasticity, the PDZ motif is blocked by a single proline residue. This feature is highly conserved in vertebrates, whereas the closest invertebrate homologs of GluA4 have a canonical class I PDZ binding motif. In this work, we have examined the role of GluA4 in PDZ interactions.

Methodology/Principal Findings
Deletion of the carboxy-terminal proline residue of recombinant GluA4 conferred avid binding to SAP97 in cultured cells as shown by coimmunoprecipitation, whereas wild-type GluA4 did not associate with SAP97. Native GluA4 and SAP97 coimmunoprecipitated from mouse brain independently of the GluA1 subunit, supporting the possibility of in vivo PDZ interaction. To obtain evidence for or against the exposure of the PDZ motif by carboxyterminal processing of native GluA4 receptors, we generated an antibody reagent specific for proline-deleted GluA4 C-terminus. Immunoprecipitation and mass spectrometric analyses indicated that the carboxyl-terminus of native GluA4 AMPA receptors is intact and that the postulated single-residue cleavage does not occur to any significant extent.

Conclusion/Significance
We conclude that native GluA4 receptors are not capable of canonical PDZ interactions and that their association with SAP97 is likely to be indirect

Article numbere8715
JournalPLoS ONE
Journal citation5 (1)
ISSN1932-6203
Year2010
PublisherPublic Library of Science
Digital Object Identifier (DOI)https://doi.org/10.1371/journal.pone.0008715
PubMed ID20090852
Web address (URL)http://europepmc.org/abstract/med/20090852
Publication dates
Published14 Jan 2010

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