5VKE

Open conformation of KcsA deep-inactivated


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.37 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

Starting Model: experimental
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This is version 1.4 of the entry. See complete history


Literature

The gating cycle of a K+ channel at atomic resolution.

Cuello, L.G.Cortes, D.M.Perozo, E.

(2017) Elife 6

  • DOI: https://doi.org/10.7554/eLife.28032
  • Primary Citation of Related Structures:  
    5VK6, 5VKE, 5VKH

  • PubMed Abstract: 

    C-type inactivation in potassium channels helps fine-tune long-term channel activity through conformational changes at the selectivity filter. Here, through the use of cross-linked constitutively open constructs, we determined the structures of KcsA's mutants that stabilize the selectivity filter in its conductive (E71A, at 2.25 Å) and deep C-type inactivated (Y82A at 2.4 Å) conformations. These structural snapshots represent KcsA's transient open-conductive (O/O) and the stable open deep C-type inactivated states (O/I), respectively. The present structures provide an unprecedented view of the selectivity filter backbone in its collapsed deep C-type inactivated conformation, highlighting the close interactions with structural waters and the local allosteric interactions that couple activation and inactivation gating. Together with the structures associated with the closed-inactivated state (C/I) and in the well-known closed conductive state (C/O), this work recapitulates, at atomic resolution, the key conformational changes of a potassium channel pore domain as it progresses along its gating cycle.


  • Organizational Affiliation

    Center for Membrane Protein Research, Department of Cell Physiology and Molecular Biophysics, Texas Tech University Health Sciences Center, Lubbock, United States.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Antibody Light Chain219Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Antibody Heavy Chain212Mus musculusMutation(s): 0 
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
pH-gated potassium channel KcsA96Streptomyces lividansMutation(s): 0 
Gene Names: kcsAskc1
Membrane Entity: Yes 
UniProt
Find proteins for P0A334 (Streptomyces lividans)
Explore P0A334 
Go to UniProtKB:  P0A334
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A334
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.37 Å
  • R-Value Free: 0.228 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 156.195α = 90
b = 156.195β = 90
c = 74.172γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1RO1GM097159-01A1
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States1RO1GM097159-01A1
Welch FoundationUnited StatesBI-1757

Revision History  (Full details and data files)

  • Version 1.0: 2017-12-06
    Type: Initial release
  • Version 1.1: 2017-12-13
    Changes: Database references
  • Version 1.2: 2018-04-18
    Changes: Data collection
  • Version 1.3: 2020-01-01
    Changes: Author supporting evidence
  • Version 1.4: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description