RGD Reference Report - Actin/alpha-actinin-dependent transport of AMPA receptors in dendritic spines: role of the PDZ-LIM protein RIL. - Rat Genome Database

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Actin/alpha-actinin-dependent transport of AMPA receptors in dendritic spines: role of the PDZ-LIM protein RIL.

Authors: Schulz, Torsten W  Nakagawa, Terunaga  Licznerski, Pawel  Pawlak, Verena  Kolleker, Alexander  Rozov, Andrei  Kim, Jinhyun  Dittgen, Tanjew  Köhr, Georg  Sheng, Morgan  Seeburg, Peter H  Osten, Pavel 
Citation: Schulz TW, etal., J Neurosci. 2004 Sep 29;24(39):8584-94.
RGD ID: 13432260
Pubmed: (View Article at PubMed) PMID:15456832
DOI: Full-text: DOI:10.1523/JNEUROSCI.2100-04.2004

The efficacy of excitatory transmission in the brain depends to a large extent on synaptic AMPA receptors, hence the importance of understanding the delivery and recycling of the receptors at the synaptic sites. Here we report a novel regulation of the AMPA receptor transport by a PDZ (postsynaptic density-95/Drosophila disc large tumor suppressor zona occludens 1) and LIM (Lin11/rat Isl-1/Mec3) domain-containing protein, RIL (reversion-induced LIM protein). We show that RIL binds to the AMPA glutamate receptor subunit GluR-A C-terminal peptide via its LIM domain and to alpha-actinin via its PDZ domain. RIL is enriched in the postsynaptic density fraction isolated from rat forebrain, strongly localizes to dendritic spines in cultured neurons, and coprecipitates, together with alpha-actinin, in a protein complex isolated by immunoprecipitation of AMPA receptors from forebrain synaptosomes. Functionally, in heterologous cells, RIL links AMPA receptors to the alpha-actinin/actin cytoskeleton, an effect that appears to apply selectively to the endosomal surface-internalized population of the receptors. In cultured neurons, an overexpression of recombinant RIL increases the accumulation of AMPA receptors in dendritic spines, both at the total level, as assessed by immunodetection of endogenous GluR-A-containing receptors, and at the synaptic surface, as assessed by recording of miniature EPSCs. Our results thus indicate that RIL directs the transport of GluR-A-containing AMPA receptors to and/or within dendritic spines, in an alpha-actinin/actin-dependent manner, and that such trafficking function promotes the synaptic accumulation of the receptors.

Annotation

Gene Ontology Annotations    

Biological Process

Cellular Component

Molecular Function

Objects Annotated

Genes (Rattus norvegicus)
Actn2  (actinin alpha 2)
Gria1  (glutamate ionotropic receptor AMPA type subunit 1)
Pdlim4  (PDZ and LIM domain 4)


Additional Information