5KC7 image
Entry Detail
PDB ID:
5KC7
Title:
Crystal structure of Cbln1 (Val55-Gly58 deletion mutant)
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2016-06-05
Release Date:
2016-07-27
Method Details:
Experimental Method:
Resolution:
7.04 Å
R-Value Free:
0.35
R-Value Work:
0.26
R-Value Observed:
0.27
Space Group:
I 21 3
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Cerebellin-1
Mutations:(Val55-Gly58 deletion mutant)
Chain IDs:A, B, C, D
Chain Length:178
Number of Molecules:4
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Structural basis for integration of GluD receptors within synaptic organizer complexes.
Science 353 295 299 (2016)
PMID: 27418511 DOI: 10.1126/science.aae0104

Abstact

Ionotropic glutamate receptor (iGluR) family members are integrated into supramolecular complexes that modulate their location and function at excitatory synapses. However, a lack of structural information beyond isolated receptors or fragments thereof currently limits the mechanistic understanding of physiological iGluR signaling. Here, we report structural and functional analyses of the prototypical molecular bridge linking postsynaptic iGluR δ2 (GluD2) and presynaptic β-neurexin 1 (β-NRX1) via Cbln1, a C1q-like synaptic organizer. We show how Cbln1 hexamers "anchor" GluD2 amino-terminal domain dimers to monomeric β-NRX1. This arrangement promotes synaptogenesis and is essential for D: -serine-dependent GluD2 signaling in vivo, which underlies long-term depression of cerebellar parallel fiber-Purkinje cell (PF-PC) synapses and motor coordination in developing mice. These results lead to a model where protein and small-molecule ligands synergistically control synaptic iGluR function.

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Primary Citation of related structures