The structure of betaketoacyl-[ACP] reductase from E. coli in complex with NADP+

Experimental Data Snapshot

  • Resolution: 2.05 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.201 

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This is version 1.2 of the entry. See complete history


Cofactor-Induced Conformational Rearrangements Establish a Catalytically Competent Active Site and a Proton Relay Conduit in FabG

Price, A.C.Zhang, Y.-M.Rock, C.O.White, S.M.

(2004) Structure 12: 417-428

  • DOI: https://doi.org/10.1016/j.str.2004.02.008
  • Primary Citation of Related Structures:  
    1Q7B, 1Q7C

  • PubMed Abstract: 

    beta-Ketoacyl-acyl carrier protein reductase (FabG) is a key component in the type II fatty acid synthase system. The structures of Escherichia coli FabG and the FabG[Y151F] mutant in binary complexes with NADP(H) reveal that mechanistically important conformational changes accompany cofactor binding. The active site Ser-Tyr-Lys triad is repositioned into a catalytically competent constellation, and a hydrogen bonded network consisting of ribose hydroxyls, the Ser-Tyr-Lys triad, and four water molecules creates a proton wire to replenish the tyrosine proton donated during catalysis. Also, a disordered loop in FabG forms a substructure in the complex that shapes the entrance to the active site. A key observation is that the nicotinamide portion of the cofactor is disordered in the FabG[Y151F].NADP(H) complex, and Tyr151 appears to be necessary for high-affinity cofactor binding. Biochemical data confirm that FabG[Y151F] is defective in NADPH binding. Finally, structural changes consistent with the observed negative cooperativity of FabG are described.

  • Organizational Affiliation

    Department of Structural Biology, St Jude Children's Research Hospital, Memphis, TN 38105 USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier protein] reductase
A, B, C, D
244Escherichia coliMutation(s): 0 
Find proteins for P0AEK2 (Escherichia coli (strain K12))
Explore P0AEK2 
Go to UniProtKB:  P0AEK2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AEK2
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on NAP

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B],
N [auth C],
P [auth D]
C21 H28 N7 O17 P3
Query on CA

Download Ideal Coordinates CCD File 
E [auth A]
F [auth A]
G [auth A]
I [auth B]
J [auth B]
E [auth A],
F [auth A],
G [auth A],
I [auth B],
J [auth B],
K [auth B],
M [auth C],
O [auth D]
Binding Affinity Annotations 
IDSourceBinding Affinity
NAP Binding MOAD:  1Q7B Kd: 3500 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.05 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.201 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.748α = 90
b = 76.182β = 109.47
c = 99.733γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-02-17
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance