Crystal structure of 3-oxoacyl-ACP reductase FabG in complex with NADPH from Helicobacter pylori

Experimental Data Snapshot

  • Resolution: 2.55 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.236 

Starting Model: experimental
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The Molecular Basis of Catalysis by SDR Family Members Ketoacyl-ACP Reductase FabG and Enoyl-ACP Reductase FabI in Type-II Fatty Acid Biosynthesis.

Zhou, J.Zhang, L.Wang, Y.Song, W.Huang, Y.Mu, Y.Schmitz, W.Zhang, S.Y.Lin, H.Chen, H.Z.Ye, F.Zhang, L.

(2023) Angew Chem Int Ed Engl 62: e202313109-e202313109

  • DOI: https://doi.org/10.1002/anie.202313109
  • Primary Citation of Related Structures:  
    8JF9, 8JFA, 8JFG, 8JFH, 8JFI, 8JFJ, 8JFM, 8JFN

  • PubMed Abstract: 

    The short-chain dehydrogenase/reductase (SDR) superfamily members acyl-ACP reductases FabG and FabI are indispensable core enzymatic modules and catalytic orientation controllers in type-II fatty acid biosynthesis. Herein, we report their distinct substrate allosteric recognition and enantioselective reduction mechanisms. FabG achieves allosteric regulation of ACP and NADPH through ACP binding across two adjacent FabG monomers, while FabI follows an irreversible compulsory order of substrate binding in that NADH binding must precede that of ACP on a discrete FabI monomer. Moreover, FabG and FabI utilize a backdoor residue Phe187 or a "rheostat" α8 helix for acyl chain length selection, and their corresponding triad residues Ser142 or Tyr145 recognize the keto- or enoyl-acyl substrates, respectively, facilitating initiation of nucleophilic attack by NAD(P)H. The other two triad residues (Tyr and Lys) mediate subsequent proton transfer and (R)-3-hydroxyacyl- or saturated acyl-ACP production.

  • Organizational Affiliation

    Department of Pharmacology and Chemical Biology, State Key Laboratory of Systems Medicine for Cancer, Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China.

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, E
A, B, C, D, E, F
247Helicobacter pyloriMutation(s): 0 
Gene Names: fabGHPPN135_02765
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.55 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.236 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 139.093α = 90
b = 79.435β = 106.92
c = 151.951γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
XDSdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China22077081

Revision History  (Full details and data files)

  • Version 1.0: 2023-11-15
    Type: Initial release
  • Version 1.1: 2023-11-22
    Changes: Database references