Crystal structure of the noncanonical ketosynthase FabY from P. aeruginosa

Experimental Data Snapshot

  • Resolution: 1.35 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.148 

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Evolutionary Origins of the Multienzyme Architecture of Giant Fungal Fatty Acid Synthase.

Bukhari, H.S.Jakob, R.P.Maier, T.

(2014) Structure 22: 1775

  • DOI: https://doi.org/10.1016/j.str.2014.09.016
  • Primary Citation of Related Structures:  
    4CW4, 4CW5

  • PubMed Abstract: 

    Fungal fatty acid synthase (fFAS) is a key paradigm for the evolution of complex multienzymes. Its 48 functional domains are embedded in a matrix of scaffolding elements, which comprises almost 50% of the total sequence and determines the emergent multienzymes properties of fFAS. Catalytic domains of fFAS are derived from monofunctional bacterial enzymes, but the evolutionary origin of the scaffolding elements remains enigmatic. Here, we identify two bacterial protein families of noncanonical fatty acid biosynthesis starter enzymes and trans-acting polyketide enoyl reductases (ERs) as potential ancestors of scaffolding regions in fFAS. The architectures of both protein families are revealed by representative crystal structures of the starter enzyme FabY and DfnA-ER. In both families, a striking structural conservation of insertions to scaffolding elements in fFAS is observed, despite marginal sequence identity. The combined phylogenetic and structural data provide insights into the evolutionary origins of the complex multienzyme architecture of fFAS.

  • Organizational Affiliation

    Biozentrum, Universität Basel, Klingelbergstrasse 50/70, 4056 Basel, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BETA-KETOACYL SYNTHASE639Pseudomonas aeruginosa PAO1Mutation(s): 0 
Find proteins for Q9HU15 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9HU15 
Go to UniProtKB:  Q9HU15
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9HU15
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.35 Å
  • R-Value Free: 0.177 
  • R-Value Work: 0.148 
  • R-Value Observed: 0.148 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.37α = 90
b = 123.31β = 90
c = 100.62γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-12-17
    Type: Initial release
  • Version 2.0: 2019-10-23
    Changes: Atomic model, Data collection, Other
  • Version 2.1: 2023-12-20
    Changes: Data collection, Database references, Derived calculations, Refinement description