3T3Q

Human Cytochrome P450 2A6 I208S/I300F/G301A/S369G in complex with Pilocarpine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural comparison of cytochromes P450 2A6, 2A13, and 2E1 with pilocarpine.

DeVore, N.M.Meneely, K.M.Bart, A.G.Stephens, E.S.Battaile, K.P.Scott, E.E.

(2012) Febs J. 279: 1621-1631

  • DOI: 10.1111/j.1742-4658.2011.08412.x
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Human xenobiotic-metabolizing cytochrome P450 (CYP) enzymes can each bind and monooxygenate a diverse set of substrates, including drugs, often producing a variety of metabolites. Additionally, a single ligand can interact with multiple CYP enzymes, ...

    Human xenobiotic-metabolizing cytochrome P450 (CYP) enzymes can each bind and monooxygenate a diverse set of substrates, including drugs, often producing a variety of metabolites. Additionally, a single ligand can interact with multiple CYP enzymes, but often the protein structural similarities and differences that mediate such overlapping selectivity are not well understood. Even though the CYP superfamily has a highly canonical global protein fold, there are large variations in the active site size, topology, and conformational flexibility. We have determined how a related set of three human CYP enzymes bind and interact with a common inhibitor, the muscarinic receptor agonist drug pilocarpine. Pilocarpine binds and inhibits the hepatic CYP2A6 and respiratory CYP2A13 enzymes much more efficiently than the hepatic CYP2E1 enzyme. To elucidate key residues involved in pilocarpine binding, crystal structures of CYP2A6 (2.4 Å), CYP2A13 (3.0 Å), CYP2E1 (2.35 Å), and the CYP2A6 mutant enzyme, CYP2A6 I208S/I300F/G301A/S369G (2.1 Å) have been determined with pilocarpine in the active site. In all four structures, pilocarpine coordinates to the heme iron, but comparisons reveal how individual residues lining the active sites of these three distinct human enzymes interact differently with the inhibitor pilocarpine.


    Organizational Affiliation

    Department of Medicinal Chemistry, The University of Kansas, Lawrence, KS 66045, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cytochrome P450 2A6
A, B, C, D
476Homo sapiensMutation(s): 4 
Gene Names: CYP2A6 (CYP2A3)
EC: 1.14.13.-
Find proteins for P11509 (Homo sapiens)
Go to Gene View: CYP2A6
Go to UniProtKB:  P11509
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
9PL
Query on 9PL

Download SDF File 
Download CCD File 
A, B, C, D
(3S,4R)-3-ethyl-4-[(1-methyl-1H-imidazol-5-yl)methyl]dihydrofuran-2(3H)-one
PILOCARPINE
C11 H16 N2 O2
QCHFTSOMWOSFHM-WPRPVWTQSA-N
 Ligand Interaction
HEM
Query on HEM

Download SDF File 
Download CCD File 
A, B, C, D
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
9PLKd: 3000 - 3600 nM (94) BINDINGDB
9PLKi: 1400 - 3000 nM (94) BINDINGDB
9PLKi: 49000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.211 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 70.952α = 90.00
b = 159.836β = 91.79
c = 103.855γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
SCALAdata scaling
PHASERphasing
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-07
    Type: Initial release
  • Version 1.1: 2012-06-06
    Type: Database references
  • Version 1.2: 2017-11-08
    Type: Refinement description