Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: authors reported there is no experimental evidence

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 3 assigned by authors.

Biological Assembly 4  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A 

Biological assembly 4 assigned by authors.

Macromolecule Content

• Total Structure Weight: 229046.06 
• Atom Count: 15183 
• Residue Count: 1964 
• Unique protein chains: 1

6DWN

Structure of Human Cytochrome P450 1A1 with Erlotinib

• DOI: 10.2210/pdb6DWN/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2018-06-26 Released: 2018-10-03 
• Deposition Author(s): Bart, A.G., Scott, E.E.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences 

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å
• R-Value Free: 0.261 
• R-Value Work: 0.241 

Literature

Structures of human cytochrome P450 1A1 with bergamottin and erlotinib reveal active-site modifications for binding of diverse ligands.

Bart, A.G., Scott, E.E.

(2018) J. Biol. Chem. 293: 19201-19210

• PubMed: 30254074 
• DOI: 10.1074/jbc.RA118.005588
• Primary Citation of Related Structures:  
  6DWM


• PubMed Abstract: 
  

Human cytochrome P450 1A1 (CYP1A1) is an extrahepatic enzyme involved in the monooxygenation of structurally diverse compounds ranging from natural products to drugs and protoxins. Because CYP1A1 has a role in human carcinogenesis, inhibiting its activity may potentially aid in cancer chemoprevention, whereas utilizing CYP1A1's oxidative activity could help selectively activate anticancer prodrugs. Such potential therapeutic purposes require detailed knowledge of CYP1A1's interactions with potential ligands. Known CYP1A1 ligands also vary substantially in size, and it has not been apparent from a single existing CYP1A1 structure how larger, structurally diverse ligands are accommodated within the enclosed active site. Here, two new X-ray structures with the natural product furanocoumarin bergamottin (at 2.85 Å resolution) and the lung cancer drug erlotinib (3.0 Å) revealed binding orientations consistent with the formation of innocuous metabolites and of toxic metabolites, respectively. They also disclosed local changes in the roof of the active site that enlarge the active site and ultimately form a channel to the protein exterior. Although further structural modifications would be required to accommodate the largest CYP1A1 ligands, knowing which components of the active site are malleable provides powerful information for those attempting to use computational approaches to predict compound binding and substrate metabolism by this clinically relevant monooxygenase.

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Organizational Affiliation: 

From the Program in Biophysics and [e-mail].,From the Program in Biophysics and.,Departments of Medicinal Chemistry and.,Pharmacology, University of Michigan, Ann Arbor, Michigan 48109.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Cytochrome P450 1A1	A, B, C, D	491	Homo sapiens	Mutation(s): 0  Gene Names: CYP1A1 EC: 1.14.14.-
Find proteins for P04798 (Homo sapiens) Go to Gene View: CYP1A1 Go to UniProtKB:  P04798

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
HEM	A, B, C, D	PROTOPORPHYRIN IX CONTAINING FE HEME C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L
AQ4	A, B, C, D	[6,7-BIS(2-METHOXY-ETHOXY)QUINAZOLINE-4-YL]-(3-ETHYNYLPHENYL)AMINE ERLOTINIB C22 H23 N3 O4 AAKJLRGGTJKAMG-UHFFFAOYSA-N
CPS	A, B	3-[(3-CHOLAMIDOPROPYL)DIMETHYLAMMONIO]-1-PROPANESULFONATE CHAPS C32 H58 N2 O7 S UMCMPZBLKLEWAF-BCTGSCMUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å
• R-Value Free: 0.261 
• R-Value Work: 0.241 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 64.855	α = 90.00
b = 195.078	β = 90.00
c = 238.013	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
PHASER	phasing
Aimless	data scaling

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2018-06-26 
• Released Date: 2018-10-03 
• Deposition Author(s): Bart, A.G., Scott, E.E.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences	United States	GM076343

Revision History 

• Version 1.0: 2018-10-03
  Type: Initial release
• Version 1.1: 2018-10-10
  Type: Data collection, Database references, Structure summary
• Version 1.2: 2018-12-26
  Type: Data collection, Database references, Structure summary