4KU5

Crystal Structures of C143S Xanthomonas campestris OleA with Bound Lauric Acid and Lauroyl-CoA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.159 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Substrate Trapping in Crystals of the Thiolase OleA Identifies Three Channels That Enable Long Chain Olefin Biosynthesis.

Goblirsch, B.R.Jensen, M.R.Mohamed, F.A.Wackett, L.P.Wilmot, C.M.

(2016) J.Biol.Chem. 291: 26698-26706

  • DOI: 10.1074/jbc.M116.760892
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phylogenetically diverse microbes that produce long chain, olefinic hydrocarbons have received much attention as possible sources of renewable energy biocatalysts. One enzyme that is critical for this process is OleA, a thiolase superfamily enzyme th ...

    Phylogenetically diverse microbes that produce long chain, olefinic hydrocarbons have received much attention as possible sources of renewable energy biocatalysts. One enzyme that is critical for this process is OleA, a thiolase superfamily enzyme that condenses two fatty acyl-CoA substrates to produce a β-ketoacid product and initiates the biosynthesis of long chain olefins in bacteria. Thiolases typically utilize a ping-pong mechanism centered on an active site cysteine residue. Reaction with the first substrate produces a covalent cysteine-thioester tethered acyl group that is transferred to the second substrate through formation of a carbon-carbon bond. Although the basics of thiolase chemistry are precedented, the mechanism by which OleA accommodates two substrates with extended carbon chains and a coenzyme moiety-unusual for a thiolase-are unknown. Gaining insights into this process could enable manipulation of the system for large scale olefin production with hydrocarbon chains lengths equivalent to those of fossil fuels. In this study, mutagenesis of the active site cysteine in Xanthomonas campestris OleA (Cys143) enabled trapping of two catalytically relevant species in crystals. In the resulting structures, long chain alkyl groups (C12 and C14) and phosphopantetheinate define three substrate channels in a T-shaped configuration, explaining how OleA coordinates its two substrates and product. The C143A OleA co-crystal structure possesses a single bound acyl-CoA representing the Michaelis complex with the first substrate, whereas the C143S co-crystal structure contains both acyl-CoA and fatty acid, defining how a second substrate binds to the acyl-enzyme intermediate. An active site glutamate (Gluβ117) is positioned to deprotonate bound acyl-CoA and initiate carbon-carbon bond formation.


    Organizational Affiliation

    From the Department of Biochemistry, Molecular Biology, and Biophysics and Biotechnology Institute, University of Minnesota, St. Paul, Minnesota 55108.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-oxoacyl-[ACP] synthase III
A, B
358Xanthomonas campestris pv. campestris (strain ATCC 33913 / DSM 3586 / NCPPB 528 / LMG 568 / P 25)Mutation(s): 1 
Gene Names: fabH
Find proteins for Q8PDX2 (Xanthomonas campestris pv. campestris (strain ATCC 33913 / DSM 3586 / NCPPB 528 / LMG 568 / P 25))
Go to UniProtKB:  Q8PDX2
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download SDF File 
Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
PEG
Query on PEG

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Download CCD File 
A, B
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
DAO
Query on DAO

Download SDF File 
Download CCD File 
B
LAURIC ACID
C12 H24 O2
POULHZVOKOAJMA-UHFFFAOYSA-N
 Ligand Interaction
DCC
Query on DCC

Download SDF File 
Download CCD File 
B
DODECYL-COA
C33 H58 N7 O17 P3 S
YMCXGHLSVALICC-GMHMEAMDSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.159 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 82.204α = 90.00
b = 85.379β = 90.00
c = 102.706γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing
Blu-Icedata collection
PHENIXrefinement
PHENIXmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-05-21 
  • Released Date: 2014-07-23 
  • Deposition Author(s): Goblirsch, B.R.

Revision History 

  • Version 1.0: 2014-07-23
    Type: Initial release
  • Version 1.1: 2017-01-11
    Type: Database references