Structural Characterization of the Complex between Alpha-Naphthoflavone and Human Cytochrome P450 1B1 (CYP1B1)

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.236 

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Structural Characterization of the Complex between {alpha}-Naphthoflavone and Human Cytochrome P450 1B1.

Wang, A.Savas, U.Stout, C.D.Johnson, E.F.

(2011) J Biol Chem 286: 5736-5743

  • DOI: https://doi.org/10.1074/jbc.M110.204420
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The atomic structure of human P450 1B1 was determined by x-ray crystallography to 2.7 Å resolution with α-naphthoflavone (ANF) bound in the active site cavity. Although the amino acid sequences of human P450s 1B1 and 1A2 have diverged significantly, both enzymes exhibit narrow active site cavities, which underlie similarities in their substrate profiles. Helix I residues adopt a relatively flat conformation in both enzymes, and a characteristic distortion of helix F places Phe(231) in 1B1 and Phe(226) in 1A2 in similar positions for π-π stacking with ANF. ANF binds in a distinctly different orientation in P450 1B1 from that observed for 1A2. This reflects, in part, divergent conformations of the helix B'-C loop that are stabilized by different hydrogen-bonding interactions in the two enzymes. Additionally, differences between the two enzymes for other amino acids that line the edges of the cavity contribute to distinct orientations of ANF in the two active sites. Thus, the narrow cavity is conserved in both P450 subfamily 1A and P450 subfamily 1B with sequence divergence around the edges of the cavity that modify substrate and inhibitor binding. The conservation of these P450 1B1 active site amino acid residues across vertebrate species suggests that these structural features are conserved.

  • Organizational Affiliation

    Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cytochrome P450 1B1507Homo sapiensMutation(s): 0 
Gene Names: CYP1B1
EC: (PDB Primary Data), (UniProt)
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q16678 (Homo sapiens)
Explore Q16678 
Go to UniProtKB:  Q16678
PHAROS:  Q16678
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16678
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on HEM

Download Ideal Coordinates CCD File 
C34 H32 Fe N4 O4
Query on BHF

Download Ideal Coordinates CCD File 
C19 H12 O2
Binding Affinity Annotations 
IDSourceBinding Affinity
BHF BindingDB:  3PM0 Ki: 16 (nM) from 1 assay(s)
IC50: min: 1.3, max: 1.00e+4 (nM) from 16 assay(s)
EC50: min: 5100, max: 4.00e+4 (nM) from 3 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.236 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.17α = 90
b = 103.98β = 90
c = 62.97γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
MOSFLMdata reduction
SCALAdata 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: 2010-12-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance