4WJZ

Crystal structure of beta-ketoacyl-acyl carrier protein reductase (FabG)(G141A) from Vibrio cholerae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.5 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:  
    3OP4, 4I08, 3RRO, 3RSH, 3U09, 3TZK, 3TZC, 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 ...

    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)‡ wladek@iwonka.med.virginia.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier-protein] reductase FabGA, B, C, D251Vibrio cholerae O1 biovar El Tor str. N16961Mutation(s): 1 
Gene Names: fabGVC_2021
EC: 1.1.1.100
Find proteins for Q9KQH7 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Explore Q9KQH7 
Go to UniProtKB:  Q9KQH7
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download Ideal Coordinates CCD File 
E [auth A], F [auth D]PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.200 
  • Space Group: P 61
  • Diffraction Data DOI: 10.18430/M3J018 Protein Diffraction
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.825α = 90
b = 61.825β = 90
c = 384.704γ = 120
Software Package:
Software NamePurpose
HKL-3000data reduction
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-3000data scaling
MOLREPphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272200700058C
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesHHSN272201200026C
Department of Energy (DOE, United States)United StatesDE-AC02-06CH11357

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2015-08-26
    Changes: Data collection
  • Version 1.2: 2015-11-25
    Changes: Database references
  • Version 1.3: 2016-02-03
    Changes: Database references
  • Version 1.4: 2017-09-27
    Changes: Database references, Derived calculations, Refinement description
  • Version 1.5: 2020-01-01
    Changes: Author supporting evidence