Biological Assembly 1  

 3D View: Structure | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA,PQS (software)

Macromolecule Content

• Total Structure Weight: 57691.79 
• Atom Count: 3924 
• Residue Count: 524 
• Unique protein chains: 1

1C14

CRYSTAL STRUCTURE OF E COLI ENOYL REDUCTASE-NAD+-TRICLOSAN COMPLEX

• DOI: 10.2210/pdb1C14/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli


• Deposited: 1999-07-20 Released: 2000-07-20 
• Deposition Author(s): Qiu, X., Janson, C., Court, R., Smyth, M., Payne, D., Abdel-Meguid, S.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.263 
• R-Value Work: 0.199 

Literature

Molecular basis for triclosan activity involves a flipping loop in the active site.

Qiu, X., Janson, C.A., Court, R.I., Smyth, M.G., Payne, D.J., Abdel-Meguid, S.S.

(1999) Protein Sci. 8: 2529-2532

• PubMed: 10595560 
• DOI: 10.1110/ps.8.11.2529


• PubMed Abstract: 
  

The crystal structure of the Escherichia coli enoyl reductase-NAD+-triclosan complex has been determined at 2.5 A resolution. The Ile192-Ser198 loop is either disordered or in an open conformation in the previously reported structures of the enzyme. This loop adopts a closed conformation in our structure, forming van der Waals interactions with the inhibitor and hydrogen bonds with the bound NAD+ cofactor. The opening and closing of this flipping loop is likely an important factor in substrate or ligand recognition. The closed conformation of the loop appears to be a critical feature for the enhanced binding potency of triclosan, and a key component in future structure-based inhibitor design.

---

Organizational Affiliation: 

Department of Structural Biology, SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406, USA. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
ENOYL REDUCTASE	A, B	262	Escherichia coli (strain K12)	Mutation(s): 0  Gene Names: fabI (envM) EC: 1.3.1.9
Find proteins for P0AEK4 (Escherichia coli (strain K12)) Go to UniProtKB:  P0AEK4

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NAD	A, B	NICOTINAMIDE-ADENINE-DINUCLEOTIDE C21 H27 N7 O14 P2 BAWFJGJZGIEFAR-NNYOXOHSSA-N
TCL	A, B	TRICLOSAN C12 H7 Cl3 O2 XEFQLINVKFYRCS-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
TCL	IC50: 430 - 900 nM (100) BINDINGDB
TCL	IC50: 120 nM BINDINGMOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2 Å
• R-Value Free: 0.263 
• R-Value Work: 0.199 
• Space Group: P 6₁ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 79.000	α = 90.00
b = 79.000	β = 90.00
c = 328.750	γ = 120.00

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	phasing
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1999-07-20 
• Released Date: 2000-07-20 
• Deposition Author(s): Qiu, X., Janson, C., Court, R., Smyth, M., Payne, D., Abdel-Meguid, S.

Revision History 

• Version 1.0: 2000-07-20
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance