3QU8

Crystal structure of a human cytochrome P450 2B6 (Y226H/K262R) in complex with the inhibitor 4-(4-Nitrobenzyl)pyridine.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of Cytochrome P450 2B6 Bound to 4-Benzylpyridine and 4-(4-Nitrobenzyl)pyridine: Insight into Inhibitor Binding and Rearrangement of Active Site Side Chains.

Shah, M.B.Pascual, J.Zhang, Q.Stout, C.D.Halpert, J.R.

(2011) Mol.Pharmacol. 80: 1047-1055

  • DOI: 10.1124/mol.111.074427
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The biochemical, biophysical, and structural analysis of the cytochrome P450 2B subfamily of enzymes has provided a wealth of information regarding conformational plasticity and substrate recognition. The recent X-ray crystal structure of the drug-me ...

    The biochemical, biophysical, and structural analysis of the cytochrome P450 2B subfamily of enzymes has provided a wealth of information regarding conformational plasticity and substrate recognition. The recent X-ray crystal structure of the drug-metabolizing P450 2B6 in complex with 4-(4-chlorophenyl)imidazole (4-CPI) yielded the first atomic view of this human enzyme. However, knowledge of the structural basis of P450 2B6 specificity and inhibition has remained limited. In this study, structures of P450 2B6 were determined in complex with the potent inhibitors 4-benzylpyridine (4-BP) and 4-(4-nitrobenzyl)pyridine (4-NBP). Comparison of the present structures with the previous P450 2B6-4-CPI complex showed that reorientation of side chains of the active site residue Phe206 on the F-helix and Phe297 on the I-helix was necessary to accommodate the inhibitors. However, P450 2B6 does not require any major side chain rearrangement to bind 4-NBP compared with 4-BP, and the enzyme provides no hydrogen-bonding partners for the polar nitro group of 4-NBP within the hydrophobic active site. In addition, on the basis of these new structures, substitution of residue 172 with histidine as observed in the single nucleotide polymorphism Q172H and in P450 2B4 may contribute to a hydrogen bonding network connecting the E- and I-helices, thereby stabilizing active site residues on the I-helix. These results provide insight into the role of active site side chains upon inhibitor binding and indicate that the recognition of the benzylpyridines in the closed conformation structure of P450 2B6 is based solely on hydrophobicity, size, and shape.


    Organizational Affiliation

    Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093-0703, USA. m7shah@ucsd.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytochrome P450 2B6
A, B, C, D, E, F
476Homo sapiensMutation(s): 11 
Gene Names: CYP2B6
EC: 1.14.13.-
Find proteins for P20813 (Homo sapiens)
Go to Gene View: CYP2B6
Go to UniProtKB:  P20813
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
3QU
Query on 3QU

Download SDF File 
Download CCD File 
A, B, C, D, E
4-(4-nitrobenzyl)pyridine
C12 H10 N2 O2
MNHKUCBXXMFQDM-UHFFFAOYSA-N
 Ligand Interaction
CM5
Query on CM5

Download SDF File 
Download CCD File 
A, B, C, D, E, F
5-CYCLOHEXYL-1-PENTYL-BETA-D-MALTOSIDE
5-CYCLOHEXYLPENTYL 4-O-ALPHA-D-GLUCOPYRANOSYL-BETA-D-GLUCOPYRANOSIDE; CYMAL-5
C23 H42 O11
RVTGFZGNOSKUDA-ZNGNCRBCSA-N
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B, C, D, E, F
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.218 
  • Space Group: P 32
Unit Cell:
Length (Å)Angle (°)
a = 101.880α = 90.00
b = 101.880β = 90.00
c = 299.509γ = 120.00
Software Package:
Software NamePurpose
iMOSFLMdata reduction
REFMACrefinement
Blu-Icedata collection
SCALAdata scaling
BALBESphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-09-21
    Type: Initial release
  • Version 1.1: 2011-12-07
    Type: Database references