3T38

Corynebacterium glutamicum thioredoxin-dependent arsenate reductase Cg_ArsC1'


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Corynebacterium glutamicum survives arsenic stress with arsenate reductases coupled to two distinct redox mechanisms.

Villadangos, A.F.Van Belle, K.Wahni, K.Tamu Dufe, V.Freitas, S.Nur, H.De Galan, S.Gil, J.A.Collet, J.F.Mateos, L.M.Messens, J.

(2011) Mol Microbiol 82: 998-1014

  • DOI: https://doi.org/10.1111/j.1365-2958.2011.07882.x
  • Primary Citation of Related Structures:  
    3RH0, 3T38

  • PubMed Abstract: 

    Arsenate reductases (ArsCs) evolved independently as a defence mechanism against toxic arsenate. In the genome of Corynebacterium glutamicum, there are two arsenic resistance operons (ars1 and ars2) and four potential genes coding for arsenate reductases (Cg_ArsC1, Cg_ArsC2, Cg_ArsC1' and Cg_ArsC4). Using knockout mutants, in vitro reconstitution of redox pathways, arsenic measurements and enzyme kinetics, we show that a single organism has two different classes of arsenate reductases. Cg_ArsC1 and Cg_ArsC2 are single-cysteine monomeric enzymes coupled to the mycothiol/mycoredoxin redox pathway using a mycothiol transferase mechanism. In contrast, Cg_ArsC1' is a three-cysteine containing homodimer that uses a reduction mechanism linked to the thioredoxin pathway with a k(cat)/K(M) value which is 10(3) times higher than the one of Cg_ArsC1 or Cg_ArsC2. Cg_ArsC1' is constitutively expressed at low levels using its own promoter site. It reduces arsenate to arsenite that can then induce the expression of Cg_ArsC1 and Cg_ArsC2. We also solved the X-ray structures of Cg_ArsC1' and Cg_ArsC2. Both enzymes have a typical low-molecular-weight protein tyrosine phosphatases-I fold with a conserved oxyanion binding site. Moreover, Cg_ArsC1' is unique in bearing an N-terminal three-helical bundle that interacts with the active site of the other chain in the dimeric interface.


  • Organizational Affiliation

    Department of Molecular Biology, Area of Microbiology, University of León, León, Spain.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Arsenate Reductase
A, B
213Corynebacterium glutamicumMutation(s): 0 
Gene Names: arsc1 primecg1707Cgl1512
EC: 1
UniProt
Find proteins for Q8NQC6 (Corynebacterium glutamicum (strain ATCC 13032 / DSM 20300 / BCRC 11384 / JCM 1318 / LMG 3730 / NCIMB 10025))
Explore Q8NQC6 
Go to UniProtKB:  Q8NQC6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8NQC6
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
D1D
Query on D1D

Download Ideal Coordinates CCD File 
C [auth A](4S,5S)-1,2-DITHIANE-4,5-DIOL
C4 H8 O2 S2
YPGMOWHXEQDBBV-QWWZWVQMSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 41.8α = 90
b = 75.5β = 100.5
c = 58.1γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
SHELXSphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-11-23
    Type: Initial release
  • Version 1.1: 2011-11-30
    Changes: Structure summary