3GSL image
Entry Detail
PDB ID:
3GSL
Title:
Crystal structure of PSD-95 tandem PDZ domains 1 and 2
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2009-03-27
Release Date:
2010-09-29
Method Details:
Experimental Method:
Resolution:
2.05 Å
R-Value Free:
0.28
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Disks large homolog 4
Chain IDs:A, B
Chain Length:196
Number of Molecules:2
Biological Source:Rattus norvegicus
Primary Citation
Biomimetic divalent ligands for the acute disruption of synaptic AMPAR stabilization.
Nat.Chem.Biol. 7 81 91 (2011)
PMID: 21186349 DOI: 10.1038/nchembio.498

Abstact

The interactions of the AMPA receptor (AMPAR) auxiliary subunit Stargazin with PDZ domain-containing scaffold proteins such as PSD-95 are critical for the synaptic stabilization of AMPARs. To investigate these interactions, we have developed biomimetic competing ligands that are assembled from two Stargazin-derived PSD-95/DLG/ZO-1 (PDZ) domain-binding motifs using 'click' chemistry. Characterization of the ligands in vitro and in a cellular FRET-based model revealed an enhanced affinity for the multiple PDZ domains of PSD-95 compared to monovalent peptides. In cultured neurons, the divalent ligands competed with transmembrane AMPAR regulatory protein (TARP) for the intracellular membrane-associated guanylate kinase resulting in increased lateral diffusion and endocytosis of surface AMPARs, while showing strong inhibition of synaptic AMPAR currents. This provides evidence for a model in which the TARP-containing AMPARs are stabilized at the synapse by engaging in multivalent interactions. In light of the prevalence of PDZ domain clusters, these new biomimetic chemical tools could find broad application for acutely perturbing multivalent complexes.

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