7CDB

Structure of GABARAPL1 in complex with GABA(A) receptor gamma 2

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 

wwPDB Validation   3D Report Full Report


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Literature

Structural basis of GABARAP-mediated GABA A receptor trafficking and functions on GABAergic synaptic transmission.

Ye, J., Zou, G., Zhu, R., Kong, C., Miao, C., Zhang, M., Li, J., Xiong, W., Wang, C.

(2021) Nat Commun 12: 297-297

  • DOI: 10.1038/s41467-020-20624-z
  • Primary Citation of Related Structures:  
    7CDB

  • PubMed Abstract: 

    • GABA A receptors (GABA A Rs) are the primary fast inhibitory ion channels in the central nervous system. Dysfunction of trafficking and localization of GABA A Rs to cell membranes is clinically associated with severe psychiatric disorders in humans ...

    GABA A receptors (GABA A Rs) are the primary fast inhibitory ion channels in the central nervous system. Dysfunction of trafficking and localization of GABA A Rs to cell membranes is clinically associated with severe psychiatric disorders in humans. The GABARAP protein is known to support the stability of GABA A Rs in synapses, but the underlying molecular mechanisms remain to be elucidated. Here, we show that GABARAP/GABARAPL1 directly binds to a previously unappreciated region in the γ2 subunit of GABA A R. We demonstrate that GABARAP functions to stabilize GABA A Rs via promoting its trafficking pathway instead of blocking receptor endocytosis. The GABARAPL1-γ2-GABA A R crystal structure reveals the mechanisms underlying the complex formation. We provide evidence showing that phosphorylation of γ2-GABA A R differentially modulate the receptor's binding to GABARAP and the clathrin adaptor protein AP2. Finally, we demonstrate that GABAergic synaptic currents are reduced upon specific blockage of the GABARAP-GABA A R complex formation. Collectively, our results reveal that GABARAP/GABARAPL1, but not other members of the Atg8 family proteins, specifically regulates synaptic localization of GABA A Rs via modulating the trafficking of the receptor.

    Organizational Affiliation: 

    MOE Key Laboratory for Membraneless Organelles & Cellular Dynamics, Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, 230027, Hefei, P.R. China. cwangust@ustc.edu.cn.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid receptor-associated protein-like 1A, B123Mus musculusMutation(s): 0 
Gene Names: Gabarapl1, Apg8l, Atg8l, Gec1, MNCb-0091
UniProt
Find proteins for Q8R3R8 (Mus musculus)
Explore Q8R3R8 
Go to UniProtKB:  Q8R3R8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8R3R8
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Gamma-aminobutyric acid receptor subunit gamma-2C18Mus musculusMutation(s): 0 
Gene Names: Gabrg2
UniProt & NIH Common Fund Data Resources
Find proteins for P22723 (Mus musculus)
Explore P22723 
Go to UniProtKB:  P22723
IMPC:  MGI:95623
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22723
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT
Download Ideal Coordinates CCD File 
D [auth A],
F [auth B]		CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N		 Ligand Interaction
ACT
Query on ACT
Download Ideal Coordinates CCD File 
E [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.199 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.379α = 90
b = 89.379β = 90
c = 115.004γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)China31670734

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-02
    Type: Initial release
  • Version 1.1: 2021-01-27
    Changes: Database references