6NFV

Structure of the KcsA-G77C mutant or the 2,4-ion bound configuration of a K+ channel selectivity filter.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.13 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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.USA 116: 16829-16834

  • DOI: 10.1073/pnas.1901888116
  • Primary Citation of Related Structures:  

  • 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 <sup>+ </sup>, water, K <sup>+ </sup>-i ...

    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

    Center for Membrane Protein Research, Texas Tech University Health Sciences Center, Lubbock, TX 79430.,Cell Physiology and Molecular Biophysics, Texas Tech University Health Sciences Center, Lubbock, TX 79430; luis.cuello@ttuhsc.edu.,Cell Physiology and Molecular Biophysics, Texas Tech University Health Sciences Center, Lubbock, TX 79430.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
antibody fragment heavy chain
A
219N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
antibody fragment light chain
B
212N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
pH-gated potassium channel KcsA
C
103Streptomyces lividansMutation(s): 2 
Gene Names: kcsA (skc1)
Find proteins for P0A334 (Streptomyces lividans)
Go to UniProtKB:  P0A334
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
C
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
1EM
Query on 1EM

Download SDF File 
Download CCD File 
C
(1S)-2-HYDROXY-1-[(NONANOYLOXY)METHYL]ETHYL MYRISTATE
C26 H50 O5
IHUWMVGHYXVIRN-DEOSSOPVSA-N
 Ligand Interaction
F09
Query on F09

Download SDF File 
Download CCD File 
A
NONAN-1-OL
C9 H20 O
ZWRUINPWMLAQRD-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.13 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • Space Group: I 4
Unit Cell:
Length (Å)Angle (°)
a = 156.158α = 90.00
b = 156.158β = 90.00
c = 76.116γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited States2R01GM097159-06
Robert A. Welch FoundationUnited StatesBI-1949
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM122759
National Institutes of Health/National Institute of Neurological Disorders and StrokeUnited StatesR21NS105863

Revision History 

  • Version 1.0: 2019-08-07
    Type: Initial release
  • Version 1.1: 2019-08-21
    Type: Data collection, Database references
  • Version 1.2: 2019-08-28
    Type: Data collection, Database references