Crystal structure of beta-ketoacyl-acyl carrier protein reductase (FabG) from Vibrio cholerae in complex with NADPH

Experimental Data Snapshot

  • Resolution: 2.06 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.153 

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Dissecting the Structural Elements for the Activation of beta-Ketoacyl-(Acyl Carrier Protein) Reductase from Vibrio cholerae.

Hou, J.Zheng, H.Chruszcz, M.Zimmerman, M.D.Shumilin, I.A.Osinski, T.Demas, M.Grimshaw, S.Minor, W.

(2015) J Bacteriol 198: 463-476

  • DOI: https://doi.org/10.1128/JB.00360-15
  • Primary Citation of Related Structures:  
    3OP4, 3RRO, 3RSH, 3TZC, 3TZK, 3U09, 4I08, 4WJZ, 4WK6, 5END

  • PubMed Abstract: 

    β-Ketoacyl-(acyl carrier protein) reductase (FabG) catalyzes the key reductive reaction in the elongation cycle of fatty acid synthesis (FAS), which is a vital metabolic pathway in bacteria and a promising target for new antibiotic development. The activation of the enzyme is usually linked to the formation of a catalytic triad and cofactor binding, and crystal structures of FabG from different organisms have been captured in either the active or inactive conformation. However, the structural elements which enable activation of FabG require further exploration. Here we report the findings of structural, enzymatic, and binding studies of the FabG protein found in the causative agent of cholera, Vibrio cholerae (vcFabG). vcFabG exists predominantly as a dimer in solution and is able to self-associate to form tetramers, which is the state seen in the crystal structure. The formation of the tetramer may be promoted by the presence of the cofactor NADP(H). The transition between the dimeric and tetrameric states of vcFabG is related to changes in the conformations of the α4/α5 helices on the dimer-dimer interface. Two glycine residues adjacent to the dimer interface (G92 and G141) are identified to be the hinge for the conformational changes, while the catalytic tyrosine (Y155) and a glutamine residue that forms hydrogen bonds to both loop β4-α4 and loop β5-α5 (Q152) stabilize the active conformation. The functions of the aforementioned residues were confirmed by binding and enzymatic assays for the corresponding mutants.

  • Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia, USA Center for Structural Genomics of Infectious Diseases (CSGID)‡

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier-protein] reductase FabG
A, B
251Vibrio cholerae O1 biovar El Tor str. N16961Mutation(s): 0 
Gene Names: fabGVC2021VC_2021
Find proteins for Q9KQH7 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KQH7 
Go to UniProtKB:  Q9KQH7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9KQH7
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NDP

Download Ideal Coordinates CCD File 
H [auth A],
P [auth B]
C21 H30 N7 O17 P3
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
I [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
I [auth B],
J [auth B],
K [auth B],
L [auth B],
M [auth B],
N [auth B]
O4 S
Query on EDO

Download Ideal Coordinates CCD File 
G [auth A],
O [auth B]
C2 H6 O2
Experimental Data & Validation

Experimental Data

  • Resolution: 2.06 Å
  • R-Value Free: 0.171 
  • R-Value Work: 0.153 
  • R-Value Observed: 0.153 
  • Space Group: P 62
  • Diffraction Data: https://doi.org/10.18430/M3ZW2B
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.941α = 90
b = 63.941β = 90
c = 190.374γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-3000data collection
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

View Full Validation Report

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2012-12-12
    Type: Initial release
  • Version 1.1: 2015-11-25
    Changes: Database references
  • Version 1.2: 2016-01-27
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Refinement description
  • Version 1.4: 2022-04-13
    Changes: Database references, Derived calculations, Structure summary
  • Version 1.5: 2023-09-20
    Changes: Data collection, Refinement description