5JXB image
Entry Detail
PDB ID:
5JXB
Keywords:
Title:
PSD-95 extended PDZ3 in complex with SynGAP PBM
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2016-05-13
Release Date:
2016-09-28
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.28
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Disks large homolog 4,SynGAP
Chain IDs:A, B (auth: C)
Chain Length:123
Number of Molecules:2
Biological Source:Homo sapiens, Mus musculus
Primary Citation
Phase Transition in Postsynaptic Densities Underlies Formation of Synaptic Complexes and Synaptic Plasticity.
Cell 166 1163 1175.e12 (2016)
PMID: 27565345 DOI: 10.1016/j.cell.2016.07.008

Abstact

Postsynaptic densities (PSDs) are membrane semi-enclosed, submicron protein-enriched cellular compartments beneath postsynaptic membranes, which constantly exchange their components with bulk aqueous cytoplasm in synaptic spines. Formation and activity-dependent modulation of PSDs is considered as one of the most basic molecular events governing synaptic plasticity in the nervous system. In this study, we discover that SynGAP, one of the most abundant PSD proteins and a Ras/Rap GTPase activator, forms a homo-trimer and binds to multiple copies of PSD-95. Binding of SynGAP to PSD-95 induces phase separation of the complex, forming highly concentrated liquid-like droplets reminiscent of the PSD. The multivalent nature of the SynGAP/PSD-95 complex is critical for the phase separation to occur and for proper activity-dependent SynGAP dispersions from the PSD. In addition to revealing a dynamic anchoring mechanism of SynGAP at the PSD, our results also suggest a model for phase-transition-mediated formation of PSD.

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