3TZK

Crystal structure of 3-ketoacyl-(acyl-carrier-protein) reductase (FabG)(G92A) from Vibrio cholerae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.165 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

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: 10.1128/JB.00360-15
  • Primary Citation of Related Structures:  

  • 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 a ...

    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)‡,J. Craig Venter Institute, Rockville, Maryland, USA Center for Structural Genomics of Infectious Diseases (CSGID)‡,Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, Virginia, USA Center for Structural Genomics of Infectious Diseases (CSGID)‡ wladek@iwonka.med.virginia.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-oxoacyl-[acyl-carrier protein] reductase
A, B
251N/AMutation(s): 1 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
UNX
Query on UNX

Download SDF File 
Download CCD File 
A, B
UNKNOWN ATOM OR ION
X
*
 Ligand Interaction
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 63.290α = 90.00
b = 63.290β = 90.00
c = 190.431γ = 120.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
DMphasing
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-10-19
    Type: Initial release
  • Version 1.1: 2015-11-25
    Type: Database references
  • Version 1.2: 2016-02-03
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Refinement description