Crystal structure of FabH from Micrococcus luteus

Experimental Data Snapshot

  • Resolution: 2.20 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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Structure of FabH and factors affecting the distribution of branched fatty acids in Micrococcus luteus.

Pereira, J.H.Goh, E.B.Keasling, J.D.Beller, H.R.Adams, P.D.

(2012) Acta Crystallogr D Biol Crystallogr 68: 1320-1328

  • DOI: https://doi.org/10.1107/S0907444912028351
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Micrococcus luteus is a Gram-positive bacterium that produces iso- and anteiso-branched alkenes by the head-to-head condensation of fatty-acid thioesters [coenzyme A (CoA) or acyl carrier protein (ACP)]; this activity is of interest for the production of advanced biofuels. In an effort to better understand the control of the formation of branched fatty acids in M. luteus, the structure of FabH (MlFabH) was determined. FabH, or β-ketoacyl-ACP synthase III, catalyzes the initial step of fatty-acid biosynthesis: the condensation of malonyl-ACP with an acyl-CoA. Analysis of the MlFabH structure provides insights into its substrate selectivity with regard to length and branching of the acyl-CoA. The most structurally divergent region of FabH is the L9 loop region located at the dimer interface, which is involved in the formation of the acyl-binding channel and thus limits the substrate-channel size. The residue Phe336, which is positioned near the catalytic triad, appears to play a major role in branched-substrate selectivity. In addition to structural studies of MlFabH, transcriptional studies of M. luteus were also performed, focusing on the increase in the ratio of anteiso:iso-branched alkenes that was observed during the transition from early to late stationary phase. Gene-expression microarray analysis identified two genes involved in leucine and isoleucine metabolism that may explain this transition.

  • Organizational Affiliation

    Joint BioEnergy Institute, Emeryville, CA 94608, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier-protein] synthase 3
A, B, C, D, E
A, B, C, D, E, F
350Micrococcus luteus NCTC 2665Mutation(s): 0 
Gene Names: fabHHMPREF0569_0014Mlut_09310
Find proteins for C5CAR9 (Micrococcus luteus (strain ATCC 4698 / DSM 20030 / JCM 1464 / NBRC 3333 / NCIMB 9278 / NCTC 2665 / VKM Ac-2230))
Explore C5CAR9 
Go to UniProtKB:  C5CAR9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupC5CAR9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.20 Å
  • R-Value Free: 0.210 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.14α = 69.82
b = 85.026β = 71.37
c = 96.916γ = 85.66
Software Package:
Software NamePurpose
BOSdata collection
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-10-03
    Type: Initial release
  • Version 1.1: 2024-02-28
    Changes: Data collection, Database references