7N9L

KirBac3.1 C71S C262S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.229 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Ion currents through Kir potassium channels are gated by anionic lipids.

Jin, R.He, S.Black, K.A.Clarke, O.B.Wu, D.Bolla, J.R.Johnson, P.Periasamy, A.Wardak, A.Czabotar, P.Colman, P.M.Robinson, C.V.Laver, D.Smith, B.J.Gulbis, J.M.

(2022) Nat Commun 13: 490-490

  • DOI: https://doi.org/10.1038/s41467-022-28148-4
  • Primary Citation of Related Structures:  
    7N9K, 7N9L

  • PubMed Abstract: 

    Ion currents through potassium channels are gated. Constriction of the ion conduction pathway at the inner helix bundle, the textbook gate of Kir potassium channels, has been shown to be an ineffective permeation control, creating a rift in our understanding of how these channels are gated. Here we present evidence that anionic lipids act as interactive response elements sufficient to gate potassium conduction. We demonstrate the limiting barrier to K + permeation lies within the ion conduction pathway and show that this gate is operated by the fatty acyl tails of lipids that infiltrate the conduction pathway via fenestrations in the walls of the pore. Acyl tails occupying a surface groove extending from the cytosolic interface to the conduction pathway provide a potential means of relaying cellular signals, mediated by anionic lipid head groups bound at the canonical lipid binding site, to the internal gate.


  • Organizational Affiliation

    La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Inward rectifier potassium channel Kirbac3.1301Paramagnetospirillum magnetotacticumMutation(s): 2 
Membrane Entity: Yes 
UniProt
Find proteins for D9N164 (Paramagnetospirillum magnetotacticum)
Explore D9N164 
Go to UniProtKB:  D9N164
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD9N164
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PCW
Query on PCW

Download Ideal Coordinates CCD File 
B [auth A],
C [auth A],
D [auth A],
E [auth A]
1,2-DIOLEOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C44 H85 N O8 P
SNKAWJBJQDLSFF-NVKMUCNASA-O
TMO
Query on TMO

Download Ideal Coordinates CCD File 
F [auth A]trimethylamine oxide
C3 H9 N O
UYPYRKYUKCHHIB-UHFFFAOYSA-N
K
Query on K

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
I [auth A]
J [auth A]
K [auth A]
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.229 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 106.884α = 90
b = 106.884β = 90
c = 89.76γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
PHASERphasing
PDB_EXTRACTdata extraction
XDSdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-29
    Type: Initial release
  • Version 1.1: 2022-02-09
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description