4LP8

A Novel Open-State Crystal Structure of the Prokaryotic Inward Rectifier KirBac3.1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Control of KirBac3.1 Potassium Channel Gating at the Interface between Cytoplasmic Domains.

Zubcevic, L.Bavro, V.N.Muniz, J.R.Schmidt, M.R.Wang, S.De Zorzi, R.Venien-Bryan, C.Sansom, M.S.Nichols, C.G.Tucker, S.J.

(2014) J Biol Chem 289: 143-151

  • DOI: 10.1074/jbc.M113.501833
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • KirBac channels are prokaryotic homologs of mammalian inwardly rectifying potassium (Kir) channels, and recent structures of KirBac3.1 have provided important insights into the structural basis of gating in Kir channels. In this study, we demonstrate ...

    KirBac channels are prokaryotic homologs of mammalian inwardly rectifying potassium (Kir) channels, and recent structures of KirBac3.1 have provided important insights into the structural basis of gating in Kir channels. In this study, we demonstrate that KirBac3.1 channel activity is strongly pH-dependent, and we used x-ray crystallography to determine the structural changes that arise from an activatory mutation (S205L) located in the cytoplasmic domain (CTD). This mutation stabilizes a novel energetically favorable open conformation in which changes at the intersubunit interface in the CTD also alter the electrostatic potential of the inner cytoplasmic cavity. These results provide a structural explanation for the activatory effect of this mutation and provide a greater insight into the role of the CTD in Kir channel gating.


    Organizational Affiliation

    From the Biological Physics Group, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Inward rectifier potassium channel Kirbac3.1A301Magnetospirillum magnetotacticumMutation(s): 2 
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective
Protein: 
KirBac3.1 Open-State Channel (S129R/S205L mutant)
Find proteins for D9N164 (Magnetospirillum magnetotacticum)
Explore D9N164 
Go to UniProtKB:  D9N164
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PEG
Query on PEG

Download CCD File 
A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
K
Query on K

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

Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.183 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.65α = 90
b = 105.65β = 90
c = 89.9γ = 90
Software Package:
Software NamePurpose
GDAdata collection
PHASERphasing
BUSTERrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-11-20
    Type: Initial release
  • Version 1.1: 2013-12-18
    Changes: Database references
  • Version 1.2: 2014-01-22
    Changes: Database references