3EYW

Crystal structure of the C-terminal domain of E. coli KefC in complex with KefF

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history. 


Literature

KTN (RCK) Domains Regulate K(+) Channels and Transporters by Controlling the Dimer-Hinge Conformation.

Roosild, T.P., Castronovo, S., Miller, S., Li, C., Rasmussen, T., Bartlett, W., Gunasekera, B., Choe, S., Booth, I.R.

(2009) Structure 17: 893-903

  • DOI: 10.1016/j.str.2009.03.018
  • Primary Citation of Related Structures:  
    3EYW

  • PubMed Abstract: 

    • KTN (RCK) domains are nucleotide-binding folds that form the cytoplasmic regulatory complexes of various K+ channels and transporters. The mechanisms these proteins use to control their transmembrane pore-forming counterparts remains unclear despite ...

    KTN (RCK) domains are nucleotide-binding folds that form the cytoplasmic regulatory complexes of various K+ channels and transporters. The mechanisms these proteins use to control their transmembrane pore-forming counterparts remains unclear despite numerous electrophysiological and structural studies. KTN (RCK) domains consistently crystallize as dimers within the asymmetric unit, forming a pronounced hinge between two Rossmann folds. We have previously proposed that modification of the hinge angle plays an important role in activating the associated membrane-integrated components of the channel or transporter. Here we report the structure of the C-terminal, KTN-bearing domain of the E. coli KefC K+ efflux system in association with the ancillary subunit, KefF, which is known to stabilize the conductive state. The structure of the complex and functional analysis of KefC variants reveal that control of the conformational flexibility inherent in the KTN dimer hinge is modulated by KefF and essential for regulation of KefC ion flux.

    Organizational Affiliation: 

    Drug Development Department, Nevada Cancer Institute, Las Vegas, NV 89135, USA.



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
C-terminal domain of Glutathione-regulated potassium-efflux system protein kefC fused to full length Glutathione-regulated potassium-efflux system ancillary protein kefFA, B413Escherichia coli K-12Mutation(s): 0 
Gene Names: kefC, trkC and kefF, yabF
EC: 1.6.5.2
Find proteins for P0A754 (Escherichia coli (strain K12))
Explore P0A754 
Go to UniProtKB:  P0A754
Find proteins for P03819 (Escherichia coli (strain K12))
Explore P03819 
Go to UniProtKB:  P03819
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD
Download Ideal Coordinates CCD File 
A, B
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N		 Ligand Interaction
FMN
Query on FMN
Download Ideal Coordinates CCD File 
A, B
FLAVIN MONONUCLEOTIDE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N		 Ligand Interaction
ZN
Query on ZN
Download Ideal Coordinates CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N		 Ligand Interaction
MG
Query on MG
Download Ideal Coordinates CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.47α = 90
b = 85.015β = 90
c = 188.702γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2008-10-22 
  • Released Date: 2009-06-30 
    • Deposition Author(s): Roosild, T.P.

Revision History 

  • Version 1.0: 2009-06-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.2: 2017-08-02
    Changes: Refinement description, Source and taxonomy