3L9W

KefC C-terminal domain in complex with KefF and GSH


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 

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Ligand Structure Quality Assessment 


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 U S A 107: 19784-19789

  • DOI: 10.1073/pnas.1012716107
  • Primary Citation of Related Structures:  
    3L9X, 3L9W

  • 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 Escherichia coli KefC ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutathione-regulated potassium-efflux system protein kefC, linker, ancillary protein kefFA, B413Escherichia coli K-12Mutation(s): 0 
Gene Names: b0047JW0046kefCtrkCb0046JW0045kefFyabF
EC: 1.6.5.2
UniProt
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
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.210 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.764α = 90
b = 85.852β = 90
c = 189.229γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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