3QDO

Crystal Structure of PDZ domain of sorting nexin 27 (SNX27) fused to the Gly-Gly linker followed by C-terminal (ESESKV) of GIRK3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.147 

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: 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 ...

    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)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Sorting nexin-27, G protein-activated inward rectifier potassium channel 3 chimeraA109Rattus norvegicusMutation(s): 0 
Gene Names: Mrt1Kcnj9
UniProt
Find proteins for Q8K4V4 (Rattus norvegicus)
Explore Q8K4V4 
Go to UniProtKB:  Q8K4V4
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.88 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.147 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.795α = 90
b = 59.795β = 90
c = 53.606γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
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: 2017-07-26
    Changes: Refinement description, Source and taxonomy