5KUM

Crystal Structure of Inward Rectifier Kir2.2 K62W Mutant In Complex with PIP2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of control of inward rectifier Kir2 channel gating by bulk anionic phospholipids.

Lee, S.J.Ren, F.Zangerl-Plessl, E.M.Heyman, S.Stary-Weinzinger, A.Yuan, P.Nichols, C.G.

(2016) J.Gen.Physiol. 148: 227-237

  • DOI: 10.1085/jgp.201611616
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Inward rectifier potassium (Kir) channel activity is controlled by plasma membrane lipids. Phosphatidylinositol-4,5-bisphosphate (PIP2) binding to a primary site is required for opening of classic inward rectifier Kir2.1 and Kir2.2 channels, but inte ...

    Inward rectifier potassium (Kir) channel activity is controlled by plasma membrane lipids. Phosphatidylinositol-4,5-bisphosphate (PIP2) binding to a primary site is required for opening of classic inward rectifier Kir2.1 and Kir2.2 channels, but interaction of bulk anionic phospholipid (PL(-)) with a distinct second site is required for high PIP2 sensitivity. Here we show that introduction of a lipid-partitioning tryptophan at the second site (K62W) generates high PIP2 sensitivity, even in the absence of PL(-) Furthermore, high-resolution x-ray crystal structures of Kir2.2[K62W], with or without added PIP2 (2.8- and 2.0-Å resolution, respectively), reveal tight tethering of the C-terminal domain (CTD) to the transmembrane domain (TMD) in each condition. Our results suggest a refined model for phospholipid gating in which PL(-) binding at the second site pulls the CTD toward the membrane, inducing the formation of the high-affinity primary PIP2 site and explaining the positive allostery between PL(-) binding and PIP2 sensitivity.


    Organizational Affiliation

    Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, MO 63110 Center for the Investigation of Membrane Excitability Diseases, Washington University School of Medicine, St. Louis, MO 63110.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ATP-sensitive inward rectifier potassium channel 12
A
343Gallus gallusMutation(s): 1 
Gene Names: KCNJ12
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
Kir2.2 Inward-Rectifier Potassium Channel (Complete)
Find proteins for F1NHE9 (Gallus gallus)
Go to Gene View: KCNJ12
Go to UniProtKB:  F1NHE9
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
DMU
Query on DMU

Download SDF File 
Download CCD File 
A
DECYL-BETA-D-MALTOPYRANOSIDE
DECYLMALTOSIDE
C22 H42 O11
WOQQAWHSKSSAGF-WXFJLFHKSA-N
 Ligand Interaction
PIO
Query on PIO

Download SDF File 
Download CCD File 
A
[(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate
dioctanoyl l-alpha-phosphatidyl-d-myo-inositol 4,5-diphosphate
C25 H49 O19 P3
XLNCEHRXXWQMPK-MJUMVPIBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.198 
  • Space Group: I 4
Unit Cell:
Length (Å)Angle (°)
a = 81.303α = 90.00
b = 81.303β = 90.00
c = 183.572γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-3000data scaling
REFMACrefinement
HKL-3000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-10
    Type: Initial release
  • Version 1.1: 2016-08-31
    Type: Database references
  • Version 1.2: 2016-09-07
    Type: Database references