3NRC

Crystal Structure of the Francisella tularensis enoyl-acyl carrier protein reductase (FabI) in complex with NAD+ and triclosan


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.101 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the Francisella tularensis enoyl-acyl carrier protein reductase (FabI) in complex with NAD(+) and triclosan.

Mehboob, S.Truong, K.Santarsiero, B.D.Johnson, M.E.

(2010) Acta Crystallogr.,Sect.F 66: 1436-1440

  • DOI: 10.1107/S1744309110039862

  • PubMed Abstract: 
  • Enoyl-acyl carrier protein reductase (FabI) catalyzes the last rate-limiting step in the elongation cycle of the fatty-acid biosynthesis pathway and has been validated as a potential antimicrobial drug target in Francisella tularensis. The developmen ...

    Enoyl-acyl carrier protein reductase (FabI) catalyzes the last rate-limiting step in the elongation cycle of the fatty-acid biosynthesis pathway and has been validated as a potential antimicrobial drug target in Francisella tularensis. The development of new antibiotic therapies is important both to combat potential drug-resistant bioweapons and to address the broader societal problem of increasing antibiotic resistance among many pathogenic bacteria. The crystal structure of FabI from F. tularensis (FtuFabI) in complex with the inhibitor triclosan and the cofactor NAD(+) has been solved to a resolution of 2.1 Å. Triclosan is known to effectively inhibit FabI from different organisms. Precise characterization of the mode of triclosan binding is required to develop highly specific inhibitors. Comparison of our structure with the previously determined FtuFabI structure (PDB code 2jjy) which is bound to only NAD(+) reveals the conformation of the substrate-binding loop, electron density for which was missing in the earlier structure, and demonstrates a shift in the conformation of the NAD(+) cofactor. This shift in the position of the phosphate groups allows more room in the active site for substrate or inhibitor to bind and be better accommodated. This information will be crucial for virtual screening studies to identify novel scaffolds for development into new active inhibitors.


    Organizational Affiliation

    Center for Pharmaceutical Biotechnology, University of Illinois at Chicago, 900 South Ashland Avenue, Chicago, IL 60607, USA. shahila@uic.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Enoyl-[acyl-carrier-protein] reductase (NADH)
A, B
280Francisella tularensis subsp. tularensis (strain SCHU S4 / Schu 4)Mutation(s): 0 
Gene Names: fabI
EC: 1.3.1.9
Find proteins for Q5NGQ3 (Francisella tularensis subsp. tularensis (strain SCHU S4 / Schu 4))
Go to UniProtKB:  Q5NGQ3
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
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
TCL
Query on TCL

Download SDF File 
Download CCD File 
A, B
TRICLOSAN
C12 H7 Cl3 O2
XEFQLINVKFYRCS-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
TCLIC50: 1300 nM (100) BINDINGDB
TCLKi: 0.1 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.101 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.186 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 123.080α = 90.00
b = 85.120β = 90.00
c = 51.760γ = 90.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XSCALEdata scaling
PHENIXrefinement
HKL-2000data collection
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-11-10
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2013-06-19
    Type: Database references
  • Version 1.3: 2016-12-28
    Type: Structure summary