Cystal structure of Arabidopsis ATR2

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 

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Structure of the Arabidopsis thaliana NADPH-cytochrome P450 reductase 2 (ATR2) provides insight into its function

Niu, G.Zhao, S.Wang, L.Dong, W.Liu, L.He, Y.

(2017) FEBS J 284: 754-765

  • DOI: https://doi.org/10.1111/febs.14017
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Members of the cytochrome P450 family catalyze a variety of mono-oxygenase reactions, and for the eukaryotic membrane-bound members, NADPH is typically used as the reducing agent. The flavoprotein NADPH-cytochrome P450 reductase (CPR) enables electron transfer from NADPH to cytochrome P450 via its flavin cofactors. ATR2 is one of the two authentic CPR genes in the genome of the model plant Arabidopsis thaliana, and its product has been physiologically and kinetically characterized. Here, we report the 2.3 Å structure of Arabidopsis thaliana NADPH-cytochrome P450 reductase 2 (ATR2) and find that the position of the two flavin cofactors differs from that of other known CPR structures. Mutation of residues related to possible interflavin electron transfer retains the reductase activity of ATR2, which suggests a direct electron transfer pathway between the flavins. In contrast, mutation of a single residue (R708) mediating interdomain interaction abolishes this activity. Because this residue is only conserved in plant CPRs, we speculate a plant-specific working mechanism as observed in ATR2. Atomic coordinates and structure factors of ATR2 are available in the Protein Data Bank under the accession code 5GXU.

  • Organizational Affiliation

    College of Life Sciences, Capital Normal University, Beijing, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
NADPH--cytochrome P450 reductase 2
A, B
640Arabidopsis thalianaMutation(s): 0 
Gene Names: ATR2
Find proteins for Q9SUM3 (Arabidopsis thaliana)
Explore Q9SUM3 
Go to UniProtKB:  Q9SUM3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9SUM3
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.202 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.333α = 97.84
b = 61.821β = 100.51
c = 88.331γ = 90.27
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-25
    Type: Initial release
  • Version 1.1: 2017-02-15
    Changes: Database references
  • Version 1.2: 2017-03-15
    Changes: Database references
  • Version 1.3: 2023-11-08
    Changes: Data collection, Database references, Refinement description