2FOI

Synthesis, Biological Activity, and X-Ray Crystal Structural Analysis of Diaryl Ether Inhibitors of Malarial Enoyl ACP Reductase.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.3 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.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:  
    2FOI, 2NQ8, 2OL4, 2OP1, 2OP0, 2OOS

  • 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 carrier protein reductase (PfENR) ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
enoyl-acyl carrier reductaseAB269Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PfENRPF3D7_0615100
EC: 1.3.1.9
Find proteins for C6KSZ2 (Plasmodium falciparum (isolate 3D7))
Explore C6KSZ2 
Go to UniProtKB:  C6KSZ2
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
enoyl-acyl carrier reductaseCD60Plasmodium falciparum 3D7Mutation(s): 0 
Gene Names: PfENRPF3D7_0615100
EC: 1.3.1.9
Find proteins for C6KSZ2 (Plasmodium falciparum (isolate 3D7))
Explore C6KSZ2 
Go to UniProtKB:  C6KSZ2
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

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

Download CCD File 
A, B
4-(2,4-DICHLOROPHENOXY)-2'-METHYLBIPHENYL-3-OL
C19 H14 Cl2 O2
VDWAWADVXJMBAA-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
JPAIC50:  440   nM  Binding MOAD
JPAIC50:  440   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.193 
  • R-Value Observed: 0.197 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 130.861α = 90
b = 130.861β = 90
c = 82.687γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-01-16
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description