3SS8

Crystal structure of NFeoB from S. thermophilus bound to GDP.AlF4- and K+


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.216 

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


Literature

The initiation of GTP hydrolysis by the G-domain of FeoB: insights from a transition-state complex structure

Ash, M.R.Maher, M.J.Guss, J.M.Jormakka, M.

(2011) PLoS One 6: e23355-e23355

  • DOI: https://doi.org/10.1371/journal.pone.0023355
  • Primary Citation of Related Structures:  
    3SS8

  • PubMed Abstract: 

    The polytopic membrane protein FeoB is a ferrous iron transporter in prokaryotes. The protein contains a potassium-activated GTPase domain that is essential in regulating the import of iron and conferring virulence to many disease-causing bacteria. However, the mechanism by which the G-domain of FeoB hydrolyzes GTP is not well understood. In particular, it is not yet known how the pivotal step in GTP hydrolysis is achieved: alignment of a catalytic water molecule. In the current study, the crystal structure of the soluble domains from Streptococcus thermophilus FeoB (NFeoB(St)) in complex with the activating potassium ion and a transition-state analogue, GDP⋅AlF(4) (-), reveals a novel mode of water alignment involving contacts with the protein backbone only. In parallel to the structural studies, a series of seven mutant proteins were constructed that targeted conserved residues at the active site of NFeoB(St), and the nucleotide binding and hydrolysis properties of these were measured and compared to the wild-type protein. The results show that mutations in Thr35 abolish GTPase activity of the protein, while other conserved residues (Tyr58, Ser64, Glu66 and Glu67) are not required for water alignment by NFeoB(St). Together with the crystal structure, the findings suggest a new mechanism for hydrolysis initiation in small G-proteins, in which the attacking water molecule is aligned by contacts with the protein backbone only.


  • Organizational Affiliation

    School of Molecular Bioscience, University of Sydney, New South Wales, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferrous iron uptake transporter protein B
A, B
272Streptococcus thermophilus LMG 18311Mutation(s): 0 
Gene Names: feoB
UniProt
Find proteins for Q5M586 (Streptococcus thermophilus (strain ATCC BAA-250 / LMG 18311))
Explore Q5M586 
Go to UniProtKB:  Q5M586
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5M586
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download Ideal Coordinates CCD File 
C [auth A],
G [auth B]
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
ALF
Query on ALF

Download Ideal Coordinates CCD File 
F [auth A],
J [auth B]
TETRAFLUOROALUMINATE ION
Al F4
UYOMQIYKOOHAMK-UHFFFAOYSA-J
K
Query on K

Download Ideal Coordinates CCD File 
D [auth A],
H [auth B]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.51 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.346α = 90
b = 75.401β = 90
c = 156.494γ = 90
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
PDB_EXTRACTdata extraction
Blu-Icedata collection
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-08-24
    Type: Initial release
  • Version 1.1: 2012-06-27
    Changes: Database references
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Derived calculations, Refinement description