1LJU

X-RAY STRUCTURE OF C15A ARSENATE REDUCTASE FROM PI258 COMPLEXED WITH ARSENITE

• PDB DOI:  https://doi.org/10.2210/pdb1LJU/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Staphylococcus aureus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2002-04-22 Released: 2002-08-07 
• Deposition Author(s): Zegers, I., Martins, J.C., Willem, R., Wyns, L., Messens, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.267 
• R-Value Work: 0.241 
• R-Value Observed: 0.260 

Literature

All intermediates of the arsenate reductase mechanism, including an intramolecular dynamic disulfide cascade.

Messens, J., Martins, J.C., Van Belle, K., Brosens, E., Desmyter, A., De Gieter, M., Wieruszeski, J.M., Willem, R., Wyns, L., Zegers, I.

(2002) Proc Natl Acad Sci U S A 99: 8506-8511

• PubMed: 12072565 
• DOI: https://doi.org/10.1073/pnas.132142799
• Primary Citation of Related Structures:  
  1LJL, 1LJU, 1LK0


• PubMed Abstract: 
  

The mechanism of pI258 arsenate reductase (ArsC) catalyzed arsenate reduction, involving its P-loop structural motif and three redox active cysteines, has been unraveled. All essential intermediates are visualized with x-ray crystallography, and NMR is used to map dynamic regions in a key disulfide intermediate. Steady-state kinetics of ArsC mutants gives a view of the crucial residues for catalysis. ArsC combines a phosphatase-like nucleophilic displacement reaction with a unique intramolecular disulfide bond cascade. Within this cascade, the formation of a disulfide bond triggers a reversible "conformational switch" that transfers the oxidative equivalents to the surface of the protein, while releasing the reduced substrate.

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Organizational Affiliation: 

Dienst Ultrastructuur, Vlaams interuniversitair Instituut voor Biotechnologie, Vrije Universiteit Brussel, Paardenstraat 65, 1640 St. Genesius-Rode, Belgium. [e-mail]

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 14.96 kDa 
• Atom Count: 1,272 
• Modelled Residue Count: 131 
• Deposited Residue Count: 131 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
arsenate reductase	A	131	Staphylococcus aureus	Mutation(s): 2  Gene Names: arsC EC: 1.97.1.5 (PDB Primary Data), 1.20.4.4 (UniProt)
UniProt
Find proteins for P0A006 (Staphylococcus aureus) Explore P0A006  Go to UniProtKB:  P0A006

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
K	B [auth A]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSR	A	L-PEPTIDE LINKING	C3 H8 As N O5 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.267 
• R-Value Work: 0.241 
• R-Value Observed: 0.260 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 33.97	α = 90
b = 37.83	β = 90
c = 106.37	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2002-08-07 
Deposition Author(s): Zegers, I., Martins, J.C., Willem, R., Wyns, L., Messens, J.

Revision History  

• Version 1.0: 2002-08-07
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-10-27
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2023-08-16
  Changes: Data collection, Refinement description