2QIO

X-Ray Structure of Enoyl-Acyl Carrier Protein Reductase from Bacillus Anthracis with Triclosan


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.176 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Design and synthesis of aryl ether inhibitors of the Bacillus anthracis enoyl-ACP reductase.

Tipparaju, S.K.Mulhearn, D.C.Klein, G.M.Chen, Y.Tapadar, S.Bishop, M.H.Yang, S.Chen, J.Ghassemi, M.Santarsiero, B.D.Cook, J.L.Johlfs, M.Mesecar, A.D.Johnson, M.E.Kozikowski, A.P.

(2008) ChemMedChem 3: 1250-1268

  • DOI: 10.1002/cmdc.200800047
  • Primary Citation of Related Structures:  
    2QIO

  • PubMed Abstract: 
  • The problem of increasing bacterial resistance to the current generation of antibiotics is well documented. Known resistant pathogens such as methicillin-resistant Staphylococcus aureus are becoming more prevalent, while the potential exists for developing drug-resistant pathogens for use as bioweapons, such as Bacillus anthracis ...

    The problem of increasing bacterial resistance to the current generation of antibiotics is well documented. Known resistant pathogens such as methicillin-resistant Staphylococcus aureus are becoming more prevalent, while the potential exists for developing drug-resistant pathogens for use as bioweapons, such as Bacillus anthracis. The biphenyl ether antibacterial agent, triclosan, exhibits broad-spectrum activity by targeting the fatty acid biosynthetic pathway through inhibition of enoyl-acyl carrier protein reductase (ENR) and provides a potential scaffold for the development of new, broad-spectrum antibiotics. We used a structure-based approach to develop novel aryl ether analogues of triclosan that target ENR, the product of the fabI gene, from B. anthracis (BaENR). Structure-based design methods were used for the expansion of the compound series including X-ray crystal structure determination, molecular docking, and QSAR methods. Structural modifications were made to both phenyl rings of the 2-phenoxyphenyl core. A number of compounds exhibited improved potency against BaENR and increased efficacy against both the Sterne strain of B. anthracis and the methicillin-resistant strain of S. aureus. X-ray crystal structures of BaENR in complex with triclosan and two other compounds help explain the improved efficacy of the new compounds and suggest future rounds of optimization that might be used to improve their potency.


    Organizational Affiliation

    Drug Discovery Program, Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, 833 S. Wood St., Chicago, IL 60612, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Enoyl-(Acyl-carrier-protein) reductaseA, B, C, D256Bacillus anthracisMutation(s): 0 
Gene Names: fabIGBAA_1232
EC: 1.3.1.9
UniProt
Find proteins for A0A6L8PBX8 (Bacillus anthracis)
Explore A0A6L8PBX8 
Go to UniProtKB:  A0A6L8PBX8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A6L8PBX8
Protein Feature View
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
TCL Binding MOAD:  2QIO IC50: 3600 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.44 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.176 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.367α = 90
b = 89.024β = 90
c = 186.049γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
CNSrefinement
PDB_EXTRACTdata extraction
MAR345dtbdata collection
HKL-2000data reduction

Structure Validation

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Ligand Structure Quality Assessment 



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-07-08
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Derived calculations, Version format compliance
  • Version 1.2: 2017-10-18
    Changes: Refinement description