2OP1

Crystal structure of plasmodium falciparum enoyl ACP reductase with triclosan reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.207 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray structural analysis of Plasmodium falciparum enoyl acyl carrier protein reductase as a pathway toward the optimization of triclosan antimalarial efficacy

Freundlich, J.S.Wang, F.Tsai, H.-C.Kuo, M.Shieh, H.-M.Anderson, J.W.Nkrumah, L.J.Valderramos, J.-C.Yu, M.Kumar, T.R.S.Valderramos, S.G.Jacobs, W.R.Schiehser, G.A.Jacobus, D.P.Fidock, D.A.Sacchettini, J.C.

(2007) J.Biol.Chem. 282: 25436-25444

  • DOI: 10.1074/jbc.M701813200
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The x-ray crystal structures of five triclosan analogs, in addition to that of the isoniazid-NAD adduct, are described in relation to their integral role in the design of potent inhibitors of the malarial enzyme Plasmodium falciparum enoyl acyl carri ...

    The x-ray crystal structures of five triclosan analogs, in addition to that of the isoniazid-NAD adduct, are described in relation to their integral role in the design of potent inhibitors of the malarial enzyme Plasmodium falciparum enoyl acyl carrier protein reductase (PfENR). Many of the novel 5-substituted analogs exhibit low micromolar potency against in vitro cultures of drug-resistant and drug-sensitive strains of the P. falciparum parasite and inhibit purified PfENR enzyme with IC50 values of <200 nM. This study has significantly expanded the knowledge base with regard to the structure-activity relationship of triclosan while affording gains against cultured parasites and purified PfENR enzyme. In contrast to a recent report in the literature, these results demonstrate the ability to improve the in vitro potency of triclosan significantly by replacing the suboptimal 5-chloro group with larger hydrophobic moieties. The biological and x-ray crystallographic data thus demonstrate the flexibility of the active site and point to future rounds of optimization to improve compound potency against purified enzyme and intracellular Plasmodium parasites.


    Organizational Affiliation

    Department of Medicinal Chemistry, Jacobus Pharmaceutical Company, Princeton, New Jersey 08540, USA. joelf@princeton.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Enoyl-acyl carrier reductase
A, B
338Plasmodium falciparumMutation(s): 0 
Gene Names: FabI
Find proteins for Q9BH77 (Plasmodium falciparum)
Go to UniProtKB:  Q9BH77
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
8PC
Query on 8PC

Download SDF File 
Download CCD File 
A, B
2-(2,4-DICHLOROPHENOXY)-5-(PYRIDIN-2-YLMETHYL)PHENOL
C18 H13 Cl2 N O2
AOVDSWPGWPRTSR-UHFFFAOYSA-N
 Ligand Interaction
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
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
8PCIC50: 640 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.207 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 131.498α = 90.00
b = 131.498β = 90.00
c = 82.334γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
XFITdata reduction
REFMACrefinement
HKL-2000data scaling
HKL-2000data collection
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-01-26 
  • Released Date: 2007-07-17 
  • Deposition Author(s): Tsai, H.

Revision History 

  • Version 1.0: 2007-07-17
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance