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 

wwPDB Validation 3D Report Full Report


This is version 1.1 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.USA 108: 5831-5836

  • DOI: 10.1073/pnas.1018645108
  • Primary Citation of Related Structures:  

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Sorting nexin-27
A, B, C, D, E
101Rattus norvegicusMutation(s): 0 
Gene Names: Snx27 (Mrt1)
Find proteins for Q8K4V4 (Rattus norvegicus)
Go to UniProtKB:  Q8K4V4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
G protein-activated inward rectifier potassium channel 3
F, G, H, I, J
6Rattus norvegicusMutation(s): 0 
Gene Names: Kcnj9 (Girk3)
Find proteins for Q63511 (Rattus norvegicus)
Go to UniProtKB:  Q63511
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.31 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.234 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 45.571α = 90.00
b = 81.567β = 102.11
c = 90.678γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling
REFMACrefinement
MOLREPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-03-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance