3TCU

Crystal Structure of NaK2K Channel D68E Mutant

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 

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This is version 1.1 of the entry. See complete history. 


Literature

Protein interactions central to stabilizing the K+ channel selectivity filter in a four-sited configuration for selective K+ permeation.

Sauer, D.B., Zeng, W., Raghunathan, S., Jiang, Y.

(2011) Proc Natl Acad Sci U S A 108: 16634-16639

  • DOI: 10.1073/pnas.1111688108
  • Primary Citation of Related Structures:  
    3T1C, 3T2M, 3T4D, 3T4Z, 3TCU, 3TET

  • PubMed Abstract: 

    • The structural and functional conversion of the nonselective NaK channel to a K(+) selective channel (NaK2K) allows us to identify two key residues, Tyr and Asp in the filter sequence of TVGYGD, that participate in interactions central to stabilizing ...

    The structural and functional conversion of the nonselective NaK channel to a K(+) selective channel (NaK2K) allows us to identify two key residues, Tyr and Asp in the filter sequence of TVGYGD, that participate in interactions central to stabilizing the K(+) channel selectivity filter. By using protein crystallography and channel electrophysiology, we demonstrate that the K(+) channel filter exists as an energetically strained structure and requires these key protein interactions working in concert to hold the filter in the precisely defined four-sited configuration that is essential for selective K(+) permeation. Disruption of either interaction, as tested on both the NaK2K and eukaryotic K(v)1.6 channels, can reduce or completely abolish K(+) selectivity and in some cases may also lead to channel inactivation due to conformational changes at the filter. Additionally, on the scaffold of NaK we recapitulate the protein interactions found in the filter of the Kir channel family, which uses a distinct interaction network to achieve similar stabilization of the filter.

    Organizational Affiliation: 

    Department of Physiology, and Howard Hughes Medical Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390-9040, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Potassium channel proteinA, B97Bacillus cereus ATCC 14579Mutation(s): 2 
Gene Names: BC_0669
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group: 
Channels: Potassium, Sodium, & Proton Ion-Selective		Protein: 
NaK/NaK2K channel mutants; NaK-D66Y
Find proteins for Q81HW2 (Bacillus cereus (strain ATCC 14579 / DSM 31 / JCM 2152 / NBRC 15305 / NCIMB 9373 / NRRL B-3711))
Explore Q81HW2 
Go to UniProtKB:  Q81HW2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.203 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.395α = 90
b = 67.395β = 90
c = 84.035γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-10-05
    Type: Initial release
  • Version 1.1: 2011-10-19
    Changes: Database references