The crystal structure of plant sulfite oxidase provides insight into sulfite oxidation in plants and animals

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 

Starting Model: experimental
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The Crystal Structure of Plant Sulfite Oxidase Provides Insights Into Sulfite Oxidation in Plants and Animals

Schrader, N.Fischer, K.Theis, K.Mendel, R.R.Schwarz, G.Kisker, C.

(2003) Structure 11: 1251

  • DOI: https://doi.org/10.1016/j.str.2003.09.001
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The molybdenum cofactor (Moco) containing sulfite oxidase (SO) from Arabidopsis thaliana has recently been identified and biochemically characterized. The enzyme is found in peroxisomes and believed to detoxify excess sulfite that is produced during sulfur assimilation, or due to air pollution. Plant SO (PSO) is homodimeric and homologous to animal SO, but contains only a single Moco domain without an additional redox center. Here, we present the first crystal structure of a plant Moco enzyme, the apo-state of Arabidopsis SO at 2.6 A resolution. The overall fold and coordination of the Moco are similar to chicken SO (CSO). Comparisons of conserved surface residues and the charge distribution in PSO and CSO reveal major differences near the entrance to both active sites reflecting different electron acceptors. Arg374 has been identified as an important substrate binding residue due to its conformational change when compared to the sulfate bound structure of CSO.

  • Organizational Affiliation

    Department of Pharmacological Sciences, Center for Structural Biology, State University of New York at Stony Brook, Stony Brook, NY 11794, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F
393Arabidopsis thalianaMutation(s): 0 
Find proteins for Q9S850 (Arabidopsis thaliana)
Explore Q9S850 
Go to UniProtKB:  Q9S850
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9S850
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MTQ

Download Ideal Coordinates CCD File 
DA [auth F]
J [auth A]
N [auth B]
R [auth C]
V [auth D]
DA [auth F],
J [auth A],
N [auth B],
R [auth C],
V [auth D],
Z [auth E]
C10 H8 Mo N5 O8 P S2
Query on CS

Download Ideal Coordinates CCD File 
AA [auth F]
BA [auth F]
G [auth A]
H [auth A]
K [auth B]
AA [auth F],
BA [auth F],
G [auth A],
H [auth A],
K [auth B],
L [auth B],
O [auth C],
P [auth C],
S [auth D],
T [auth D],
W [auth E],
X [auth E]
Query on GOL

Download Ideal Coordinates CCD File 
CA [auth F]
I [auth A]
M [auth B]
Q [auth C]
U [auth D]
CA [auth F],
I [auth A],
M [auth B],
Q [auth C],
U [auth D],
Y [auth E]
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 222.918α = 90
b = 351.271β = 90
c = 158.282γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata 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: 2003-10-09
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2023-12-13
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description