Crystal structure of enoyl-ACP reductase FabI from Helicobacter pylori

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report

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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

    Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen, 518055, China.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Enoyl-[acyl-carrier-protein] reductase [NADH]
A, B, C, D, E
A, B, C, D, E, F
275Helicobacter pyloriMutation(s): 0 
Gene Names: fabICGC32_06335HPF51_0191JM68_02225
Find proteins for A0A086RSH0 (Helicobacter pylori)
Explore A0A086RSH0 
Go to UniProtKB:  A0A086RSH0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A086RSH0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.193 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 265.762α = 90
b = 68.344β = 108.59
c = 88.163γ = 90
Software Package:
Software NamePurpose
HKL-3000data scaling
HKL-3000data reduction

Structure Validation

View Full Validation Report

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