3E3K

Structural characterization of a putative endogenous metal chelator in the periplasmic nickel transporter NikA (butane-1,2,4-tricarboxylate without nickel form)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.249 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural characterization of a putative endogenous metal chelator in the periplasmic nickel transporter NikA

Cherrier, M.V.Cavazza, C.Bochot, C.Lemaire, D.Fontecilla-Camps, J.C.

(2008) Biochemistry 47: 9937-9943

  • DOI: https://doi.org/10.1021/bi801051y
  • Primary Citation of Related Structures:  
    3DP8, 3E3K

  • PubMed Abstract: 

    Escherichia coli and related bacteria require nickel for the synthesis of hydrogenases, enzymes involved in hydrogen oxidation and proton reduction. Nickel transport to the cytoplasm depends on five proteins, NikA-E. We have previously reported the three-dimensional structure of the soluble periplasmic nickel transporter NikA in a complex with FeEDTA(H 2O) (-). We have now determined the structure of EDTA-free NikA and have found that it binds a small organic molecule that contributes three ligands to the coordination of a transition metal ion. Unexpectedly, His416, which was far from the metal-binding site in the FeEDTA(H 2O) (-)-NikA complex, becomes the fourth observed ligand to the metal. The best match to the omit map electron density is obtained for butane-1,2,4-tricarboxylate (BTC). Our attempts to obtain a BTC-Ni-NikA complex using apo protein and commercial reagents resulted in nickel-free BTC-NikA. Overall, our results suggest that nickel transport in vivo requires a specific metallophore that may be BTC.


  • Organizational Affiliation

    Laboratoire de Cristallographie et de Cristallogenese des Proteines, Institut de Biologie Structurale J.P. Ebel, CEA, CNRS, Universite J. Fourier, 41 rue J. Horowitz, 38027 Grenoble Cedex 1, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nickel-binding periplasmic protein
A, B, C
502Escherichia coli K-12Mutation(s): 0 
Gene Names: nikAb3476JW3441
UniProt
Find proteins for P33590 (Escherichia coli (strain K12))
Explore P33590 
Go to UniProtKB:  P33590
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP33590
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
HCT
Query on HCT

Download Ideal Coordinates CCD File 
H [auth A],
N [auth B],
T [auth C]
(2R)-butane-1,2,4-tricarboxylic acid
C7 H10 O6
LOGBRYZYTBQBTB-SCSAIBSYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

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D [auth A],
E [auth A],
J [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
ACT
Query on ACT

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F [auth A]
K [auth B]
L [auth B]
M [auth B]
R [auth C]
F [auth A],
K [auth B],
L [auth B],
M [auth B],
R [auth C],
S [auth C]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
CL
Query on CL

Download Ideal Coordinates CCD File 
I [auth B],
O [auth C],
P [auth C],
Q [auth C]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.321 
  • R-Value Work: 0.245 
  • R-Value Observed: 0.249 
  • Space Group: P 62
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 158.7α = 90
b = 158.7β = 90
c = 134.6γ = 120
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-09-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description