Crystal Structure of B. subtilis ArsC

Experimental Data Snapshot

  • Resolution: 1.60 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 

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This is version 1.4 of the entry. See complete history


Bacillus subtilis arsenate reductase is structurally and functionally similar to low molecular weight protein tyrosine phosphatases.

Bennett, M.S.Guan, Z.Laurberg, M.Su, X.D.

(2001) Proc Natl Acad Sci U S A 98: 13577-13582

  • DOI: https://doi.org/10.1073/pnas.241397198
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Arsenate is an abundant oxyanion that, because of its ability to mimic the phosphate group, is toxic to cells. Arsenate reductase (EC; encoded by the arsC gene in bacteria) participates to achieve arsenate resistance in both prokaryotes and yeast by reducing arsenate to arsenite; the arsenite is then exported by a specific transporter. The crystal structure of Bacillus subtilis arsenate reductase in the reduced form with a bound sulfate ion in its active site is solved at 1.6-A resolution. Significant structural similarity is seen between arsenate reductase and bovine low molecular weight protein tyrosine phosphatase, despite very low sequence identity. The similarity is especially high between their active sites. It is further confirmed that this structural homology is relevant functionally by showing the phosphatase activity of the arsenate reductase in vitro. Thus, we can understand the arsenate reduction in the light of low molecular weight protein tyrosine phosphatase mechanism and also explain the catalytic roles of essential residues such as Cys-10, Cys-82, Cys-89, Arg-16, and Asp-105. A "triple cysteine redox relay" is proposed for the arsenate reduction mechanism.

  • Organizational Affiliation

    Department of Molecular Biophysics, Kemicentrum, P.O. Box 124, Lund University, SE-221 00 Lund, Sweden.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
139Bacillus subtilisMutation(s): 0 
Gene Names: arsC
Find proteins for P45947 (Bacillus subtilis (strain 168))
Explore P45947 
Go to UniProtKB:  P45947
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP45947
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.60 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.226 
  • R-Value Observed: 0.226 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.94α = 90
b = 94.31β = 90
c = 118.7γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-10-24
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Data collection, Refinement description
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations