6PA0 | pdb_00006pa0

Structure of the G77A mutant in Sodium Chloride

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 
    0.233 (Depositor), 0.234 (DCC) 
  • R-Value Work: 
    0.196 (Depositor), 0.197 (DCC) 
  • R-Value Observed: 
    0.197 (Depositor) 

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Literature

Structure, function, and ion-binding properties of a K+channel stabilized in the 2,4-ion-bound configuration.

Tilegenova, C., Cortes, D.M., Jahovic, N., Hardy, E., Hariharan, P., Guan, L., Cuello, L.G.

(2019) Proc Natl Acad Sci U S A 116: 16829-16834

  • DOI: https://doi.org/10.1073/pnas.1901888116
  • Primary Citation Related Structures: 
    6NFU, 6NFV, 6PA0

  • PubMed Abstract: 

    Here, we present the atomic resolution crystallographic structure, the function, and the ion-binding properties of the KcsA mutants, G77A and G77C, that stabilize the 2,4-ion-bound configuration (i.e., water, K + , water, K + -ion-bound configuration) of the K + channel's selectivity filter. A full functional and thermodynamic characterization of the G77A mutant revealed wild-type-like ion selectivity and apparent K + -binding affinity, in addition to showing a lack of C-type inactivation gating and a marked reduction in its single-channel conductance. These structures validate, from a structural point of view, the notion that 2 isoenergetic ion-bound configurations coexist within a K + channel's selectivity filter, which fully agrees with the water-K + -ion-coupled transport detected by streaming potential measurements.

    • Organizational Affiliation: 
    • Cell Physiology and Molecular Biophysics, Texas Tech University Health Sciences Center, Lubbock, TX 79430.

Macromolecule Content 

  • Total Structure Weight: 58.63 kDa 
  • Atom Count: 4,277 
  • Modeled Residue Count: 534 
  • Deposited Residue Count: 534 
  • Unique protein chains: 3

Macromolecules

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|  3D Structure
Entity ID: 1
MoleculeChains  Sequence LengthOrganismDetailsImage
Antibody HEAVY fragment219Mus musculusMutation(s): 0 
Find similar proteins by:
|  3D Structure
Entity ID: 2
MoleculeChains  Sequence LengthOrganismDetailsImage
Antibody LIGHT fragment212Mus musculusMutation(s): 0 
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|  3D Structure
Entity ID: 3
MoleculeChains  Sequence LengthOrganismDetailsImage
pH-gated potassium channel KcsA103Streptomyces lividansMutation(s): 2 
Gene Names: kcsA, skc1
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
Sequence Annotations
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Reference Sequence

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free:  0.233 (Depositor), 0.234 (DCC) 
  • R-Value Work:  0.196 (Depositor), 0.197 (DCC) 
  • R-Value Observed: 0.197 (Depositor) 
Space Group: I 4
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 155.018α = 90
b = 155.018β = 90
c = 76.102γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-3000data scaling
PHENIXphasing

Structure Validation

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Entry History 

& Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United States2R01GM097159-06
Welch FoundationUnited StatesBI-1949
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01GM122759
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesR21NS105863

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-08-21
    Changes: Data collection, Database references
  • Version 1.2: 2019-08-28
    Changes: Data collection, Database references
  • Version 1.3: 2019-12-11
    Changes: Derived calculations
  • Version 1.4: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.5: 2024-10-23
    Changes: Data collection, Database references, Derived calculations, Structure summary