1C14

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


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • 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. ...

    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. xiayang_qiu-1@sbphrd.com




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENOYL REDUCTASE
A, B
262Escherichia 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
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download SDF File 
Download CCD File 
A, B
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
TCL
Query on TCL

Download SDF File 
Download CCD File 
A, B
TRICLOSAN
C12 H7 Cl3 O2
XEFQLINVKFYRCS-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TCLIC50: 430 - 900 nM (100) BINDINGDB
TCLIC50: 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 = 79.000α = 90.00
b = 79.000β = 90.00
c = 328.750γ = 120.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
DENZOdata reduction
SCALEPACKdata scaling
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

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