3FNH

Crystal structure of InhA bound to triclosan derivative


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Triclosan Derivatives: Towards Potent Inhibitors of Drug-Sensitive and Drug-Resistant Mycobacterium tuberculosis.

Freundlich, J.S.Wang, F.Vilcheze, C.Gulten, G.Langley, R.Schiehser, G.A.Jacobus, D.P.Jacobs, W.R.Sacchettini, J.C.

(2009) ChemMedChem 4: 241-248

  • DOI: 10.1002/cmdc.200800261
  • Primary Citation of Related Structures:  
    3FNE, 3FNF, 3FNG, 3FNH

  • PubMed Abstract: 
  • Triclosan has been previously shown to inhibit InhA, an essential enoyl acyl carrier protein reductase involved in mycolic acid biosynthesis, the inhibition of which leads to the lysis of Mycobacterium tuberculosis. Using a structure-based drug design approach, a series of 5-substituted triclosan derivatives was developed ...

    Triclosan has been previously shown to inhibit InhA, an essential enoyl acyl carrier protein reductase involved in mycolic acid biosynthesis, the inhibition of which leads to the lysis of Mycobacterium tuberculosis. Using a structure-based drug design approach, a series of 5-substituted triclosan derivatives was developed. Two groups of derivatives with alkyl and aryl substituents, respectively, were identified with dramatically enhanced potency against purified InhA. The most efficacious inhibitor displayed an IC(50) value of 21 nM, which was 50-fold more potent than triclosan. X-ray crystal structures of InhA in complex with four triclosan derivatives revealed the structural basis for the inhibitory activity. Six selected triclosan derivatives were tested against isoniazid-sensitive and resistant strains of M. tuberculosis. Among those, the best inhibitor had an MIC value of 4.7 microg mL(-1) (13 microM), which represents a tenfold improvement over the bacteriocidal activity of triclosan. A subset of these triclosan analogues was more potent than isoniazid against two isoniazid-resistant M. tuberculosis strains, demonstrating the significant potential for structure-based design in the development of next generation antitubercular drugs.


    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Enoyl-[acyl-carrier-protein] reductase [NADH]A269Mycobacterium tuberculosisMutation(s): 0 
Gene Names: inhARv1484MT1531MTCY277.05
EC: 1.3.1.9
UniProt
Find proteins for P9WGR1 (Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv))
Explore P9WGR1 
Go to UniProtKB:  P9WGR1
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD (Subject of Investigation/LOI)
Query on NAD

Download Ideal Coordinates CCD File 
B [auth A]NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
JPJ (Subject of Investigation/LOI)
Query on JPJ

Download Ideal Coordinates CCD File 
C [auth A]2-(2,4-DICHLOROPHENOXY)-5-(2-PHENYLETHYL)PHENOL
C20 H16 Cl2 O2
SOSAEWQXZFTNAQ-UHFFFAOYSA-N
 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
JPJ BindingDB:  3FNH IC50: 21 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.223 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.022α = 90
b = 90.022β = 90
c = 183.144γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
MOLREPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2008-12-24 
  • Released Date: 2009-01-20 
  • Deposition Author(s): Wang, F.

Revision History  (Full details and data files)

  • Version 1.0: 2009-01-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance