1NHG

CRYSTAL STRUCTURE ANALYSIS OF PLASMODIUM FALCIPARUM ENOYL-ACYL-CARRIER-PROTEIN REDUCTASE WITH TRICLOSAN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.43 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.171 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural Elucidation of the Specificity of the Antibacterial Agent Triclosan for Malarial Enoyl Acyl Carrier Protein Reductase

Perozzo, R.Kuo, M.Sidhu, A.S.Valiyaveettil, J.T.Bittman, R.Jacobs Jr., W.R.Fidock, D.A.Sacchettini, J.C.

(2002) J Biol Chem 277: 13106-13114

  • DOI: 10.1074/jbc.M112000200
  • Primary Citation of Related Structures:  
    1NHG, 1NHW, 1NNU, 1VRW

  • PubMed Abstract: 
  • The human malaria parasite Plasmodium falciparum synthesizes fatty acids using a type II pathway that is absent in humans. The final step in fatty acid elongation is catalyzed by enoyl acyl carrier protein reductase, a validated antimicrobial drug ta ...

    The human malaria parasite Plasmodium falciparum synthesizes fatty acids using a type II pathway that is absent in humans. The final step in fatty acid elongation is catalyzed by enoyl acyl carrier protein reductase, a validated antimicrobial drug target. Here, we report the cloning and expression of the P. falciparum enoyl acyl carrier protein reductase gene, which encodes a 50-kDa protein (PfENR) predicted to target to the unique parasite apicoplast. Purified PfENR was crystallized, and its structure resolved as a binary complex with NADH, a ternary complex with triclosan and NAD(+), and as ternary complexes bound to the triclosan analogs 1 and 2 with NADH. Novel structural features were identified in the PfENR binding loop region that most closely resembled bacterial homologs; elsewhere the protein was similar to ENR from the plant Brassica napus (root mean square for Calphas, 0.30 A). Triclosan and its analogs 1 and 2 killed multidrug-resistant strains of intra-erythrocytic P. falciparum parasites at sub to low micromolar concentrations in vitro. These data define the structural basis of triclosan binding to PfENR and will facilitate structure-based optimization of PfENR inhibitors.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
enoyl-acyl carrier reductaseAB229Plasmodium falciparumMutation(s): 0 
Gene Names: FabI
EC: 1.3.1.9
Find proteins for Q9BH77 (Plasmodium falciparum)
Explore Q9BH77 
Go to UniProtKB:  Q9BH77
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 falciparumMutation(s): 0 
Gene Names: FabI
EC: 1.3.1.9
Find proteins for Q9BH77 (Plasmodium falciparum)
Explore Q9BH77 
Go to UniProtKB:  Q9BH77
Protein Feature View
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  • 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
TCL
Query on TCL

Download CCD File 
A, B
TRICLOSAN
C12 H7 Cl3 O2
XEFQLINVKFYRCS-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TCLIC50:  49   nM  BindingDB
TCLIC50:  200   nM  BindingDB
TCLIC50:  73   nM  BindingDB
TCLKi:  0.10999999940395355   nM  BindingDB
TCLIC50:  66   nM  BindingDB
TCLKi:  7.289999961853027   nM  BindingDB
TCLKi:  13.720000267028809   nM  BindingDB
TCLIC50:  70   nM  BindingDB
TCLIC50:  73   nM  BindingDB
TCLKi:  1   nM  BindingDB
TCLKi:  0.05000000074505806   nM  BindingDB
TCLKi:  0.800000011920929   nM  BindingDB
TCLKi:  0.2800000011920929   nM  BindingDB
TCLKi:  50   nM  Binding MOAD
TCLKi:  10   nM  BindingDB
TCLKi:  0   nM  BindingDB
TCLKi:  8   nM  BindingDB
TCLKi:  8.25   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.43 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.171 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 133.082α = 90
b = 133.082β = 90
c = 84.157γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-02-25
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance