5MY5

Tungstate binding protein - TupA - from Desulfovibrio alaskensis G20


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Highly selective tungstate transporter protein TupA from Desulfovibrio alaskensis G20.

Otrelo-Cardoso, A.R.Nair, R.R.Correia, M.A.S.Cordeiro, R.S.C.Panjkovich, A.Svergun, D.I.Santos-Silva, T.Rivas, M.G.

(2017) Sci Rep 7: 5798-5798

  • DOI: 10.1038/s41598-017-06133-y

  • PubMed Abstract: 
  • Molybdenum and tungsten are taken up by bacteria and archaea as their soluble oxyanions through high affinity transport systems belonging to the ATP-binding cassette (ABC) transporters. The component A (ModA/TupA) of these transporters is the first s ...

    Molybdenum and tungsten are taken up by bacteria and archaea as their soluble oxyanions through high affinity transport systems belonging to the ATP-binding cassette (ABC) transporters. The component A (ModA/TupA) of these transporters is the first selection gate from which the cell differentiates between MoO42-, WO42- and other similar oxyanions. We report the biochemical characterization and the crystal structure of the apo-TupA from Desulfovibrio desulfuricans G20, at 1.4 Å resolution. Small Angle X-ray Scattering data suggests that the protein adopts a closed and more stable conformation upon ion binding. The role of the arginine 118 in the selectivity of the oxyanion was also investigated and three mutants were constructed: R118K, R118E and R118Q. Isothermal titration calorimetry clearly shows the relevance of this residue for metal discrimination and oxyanion binding. In this sense, the three variants lost the ability to coordinate molybdate and the R118K mutant keeps an extremely high affinity for tungstate. These results contribute to an understanding of the metal-protein interaction, making it a suitable candidate for a recognition element of a biosensor for tungsten detection.


    Related Citations: 
    • TupA: a tungstate binding protein in the periplasm of Desulfovibrio alaskensis G20.
      Otrelo-Cardoso, A.R.,Nair, R.R.,Correia, M.A.S.,Rivas, M.G.,Santos-Silva, T.
      (2014) Int J Mol Sci 15: 11783


    Organizational Affiliation

    UCIBIO/REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516, Caparica, Portugal.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ABC transporter periplasmic substrate-binding protein
A
274Desulfovibrio alaskensis (strain G20)Mutation(s): 2 
Find proteins for Q316W1 (Desulfovibrio alaskensis (strain G20))
Go to UniProtKB:  Q316W1
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

Download SDF File 
Download CCD File 
A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.176 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 52.323α = 90.00
b = 42.530β = 95.45
c = 54.753γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
Aimlessdata scaling
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
FCT/MCTESPortugalEXPL/BBB-BEP/0274/2012
FCT/MCTESPortugalPTDC/QEQ-MED/1902/2014
FCT/MCTESPortugalSFRH/BD/85806/2012

Revision History 

  • Version 1.0: 2017-08-02
    Type: Initial release