3QGL

Crystal Structure of PDZ domain of sorting nexin 27 (SNX27) in complex with the ESESKV peptide corresponding to the C-terminal tail of GIRK3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.31 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mechanism underlying selective regulation of G protein-gated inwardly rectifying potassium channels by the psychostimulant-sensitive sorting nexin 27.

Balana, B.Maslennikov, I.Kwiatkowski, W.Stern, K.M.Bahima, L.Choe, S.Slesinger, P.A.

(2011) Proc Natl Acad Sci U S A 108: 5831-5836

  • DOI: https://doi.org/10.1073/pnas.1018645108
  • Primary Citation of Related Structures:  
    3QDO, 3QE1, 3QGL

  • PubMed Abstract: 

    G protein-gated inwardly rectifying potassium (GIRK) channels are important gatekeepers of neuronal excitability. The surface expression of neuronal GIRK channels is regulated by the psychostimulant-sensitive sorting nexin 27 (SNX27) protein through a class I (-X-Ser/Thr-X-Φ, where X is any residue and Φ is a hydrophobic amino acid) PDZ-binding interaction. The G protein-insensitive inward rectifier channel (IRK1) contains the same class I PDZ-binding motif but associates with a different synaptic PDZ protein, postsynaptic density protein 95 (PSD95). The mechanism by which SNX27 and PSD95 discriminate these channels was previously unclear. Using high-resolution structures coupled with biochemical and functional analyses, we identified key amino acids upstream of the channel's canonical PDZ-binding motif that associate electrostatically with a unique structural pocket in the SNX27-PDZ domain. Changing specific charged residues in the channel's carboxyl terminus or in the PDZ domain converts the selective association and functional regulation by SNX27. Elucidation of this unique interaction site between ion channels and PDZ-containing proteins could provide a therapeutic target for treating brain diseases.


  • Organizational Affiliation

    Clayton Foundation Laboratories for Peptide Biology, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Sorting nexin-27A,
C [auth B],
E [auth C],
G [auth D],
I [auth E]
101Rattus norvegicusMutation(s): 0 
Gene Names: Mrt1Snx27
UniProt
Find proteins for Q8K4V4 (Rattus norvegicus)
Explore Q8K4V4 
Go to UniProtKB:  Q8K4V4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8K4V4
Sequence Annotations
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  • Reference Sequence

Find similar proteins by:  Sequence   |   3D Structure  

Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
G protein-activated inward rectifier potassium channel 3B [auth F],
D [auth G],
F [auth H],
H [auth I],
J
6Rattus norvegicusMutation(s): 0 
UniProt
Find proteins for Q63511 (Rattus norvegicus)
Explore Q63511 
Go to UniProtKB:  Q63511
Entity Groups  
UniProt GroupQ63511
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.31 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.571α = 90
b = 81.567β = 102.11
c = 90.678γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-13
    Changes: Data collection, Database references, Refinement description