3L9X

KefC C-terminal domain in complex with KefF and ESG


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mechanism of ligand-gated potassium efflux in bacterial pathogens.

Roosild, T.P.Castronovo, S.Healy, J.Miller, S.Pliotas, C.Rasmussen, T.Bartlett, W.Conway, S.J.Booth, I.R.

(2010) Proc.Natl.Acad.Sci.USA 107: 19784-19789

  • DOI: 10.1073/pnas.1012716107
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Gram negative pathogens are protected against toxic electrophilic compounds by glutathione-gated potassium efflux systems (Kef) that modulate cytoplasmic pH. We have elucidated the mechanism of gating through structural and functional analysis of Esc ...

    Gram negative pathogens are protected against toxic electrophilic compounds by glutathione-gated potassium efflux systems (Kef) that modulate cytoplasmic pH. We have elucidated the mechanism of gating through structural and functional analysis of Escherichia coli KefC. The revealed mechanism can explain how subtle chemical differences in glutathione derivatives can produce opposite effects on channel function. Kef channels are regulated by potassium transport and NAD-binding (KTN) domains that sense both reduced glutathione, which inhibits Kef activity, and glutathione adducts that form during electrophile detoxification and activate Kef. We find that reduced glutathione stabilizes an interdomain association between two KTN folds, whereas large adducts sterically disrupt this interaction. F441 is identified as the pivotal residue discriminating between reduced glutathione and its conjugates. We demonstrate a major structural change on the binding of an activating ligand to a KTN-domain protein. Analysis of the regulatory interactions suggests strategies to disrupt pathogen potassium and pH homeostasis.


    Organizational Affiliation

    Drug Development Department, Nevada Cancer Institute, Las Vegas, NV 89135, USA. troosild@nvcancer.org




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutathione-regulated potassium-efflux system protein kefC, linker, ancillary protein kefF
A, B
413Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: kefC (trkC), kefF (yabF)
Find proteins for P03819 (Escherichia coli (strain K12))
Go to UniProtKB:  P03819
Find proteins for P0A754 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A754
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
FMN
Query on FMN

Download SDF File 
Download CCD File 
A, B
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
L9X
Query on L9X

Download SDF File 
Download CCD File 
B
L-gamma-glutamyl-S-[(3R)-1-ethyl-2,5-dioxopyrrolidin-3-yl]-L-cysteinylglycine
C16 H24 N4 O8 S
QCPAUAAIPLHRLB-LPEHRKFASA-N
 Ligand Interaction
ESG
Query on ESG

Download SDF File 
Download CCD File 
B
L-gamma-glutamyl-S-[(3S)-1-ethyl-2,5-dioxopyrrolidin-3-yl]-L-cysteinylglycine
C16 H24 N4 O8 S
QCPAUAAIPLHRLB-GUBZILKMSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 64.949α = 90.00
b = 85.941β = 90.00
c = 189.408γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
REFMACrefinement
SCALEPACKdata scaling
MOLREPphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-01-05 
  • Released Date: 2010-11-17 
  • Deposition Author(s): Roosild, T.P.

Revision History 

  • Version 1.0: 2010-11-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-08-16
    Type: Refinement description, Source and taxonomy
  • Version 1.3: 2017-11-01
    Type: Refinement description