Crystal structure of E. coli FabI in complex with NAD and 5-bromo-2-(4-chloro-2-hydroxyphenoxy)benzonitrile

Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 

wwPDB Validation   3D Report Full Report

Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


An Ordered Water Channel in Staphylococcus Aureus Fabi: Unraveling the Mechanism of Substrate Recognition and Reduction.

Schiebel, J.Chang, A.Merget, B.Bommineni, G.R.Yu, W.Spagnuolo, L.A.Baxter, M.V.Tareilus, M.Tonge, P.J.Kisker, C.Sotriffer, C.A.

(2015) Biochemistry 54: 1943

  • DOI: https://doi.org/10.1021/bi5014358
  • Primary Citation of Related Structures:  
    4D41, 4D42, 4D43, 4D44, 4D45, 4D46

  • PubMed Abstract: 

    One third of all drugs in clinical use owe their pharmacological activity to the functional inhibition of enzymes, highlighting the importance of enzymatic targets for drug development. Because of the close relationship between inhibition and catalysis, understanding the recognition and turnover of enzymatic substrates is essential for rational drug design. Although the Staphylococcus aureus enoyl-acyl carrier protein reductase (saFabI) involved in bacterial fatty acid biosynthesis constitutes a very promising target for the development of novel, urgently needed anti-staphylococcal agents, the substrate binding mode and catalytic mechanism remained unclear for this enzyme. Using a combined crystallographic, kinetic, and computational approach, we have explored the chemical properties of the saFabI binding cavity, obtaining a consistent mechanistic model for substrate binding and turnover. We identified a water-molecule network linking the active site with a water basin inside the homo-tetrameric protein, which seems to be crucial for the closure of the flexible substrate binding loop as well as for an effective hydride and proton transfer during catalysis. On the basis of our results, we also derive a new model for the FabI-ACP complex that reveals how the ACP-bound acyl-substrate is injected into the FabI binding crevice. These findings support the future development of novel FabI inhibitors that target the FabI-ACP interface leading to the disruption of the interaction between these two proteins.

  • Organizational Affiliation

    †Institute of Pharmacy and Food Chemistry, University of Wuerzburg, Am Hubland, D-97074 Wuerzburg, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
270Escherichia coli BL21(DE3)Mutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.168 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.144α = 90
b = 79.144β = 90
c = 322.316γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report

Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-04
    Type: Initial release
  • Version 1.1: 2015-04-15
    Changes: Database references
  • Version 1.2: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Other, Refinement description