4NBT

Crystal structure of FabG from Acholeplasma laidlawii


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.128 
  • R-Value Observed: 0.129 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Biochemical and Structural Studies of NADH-Dependent FabG Used To Increase the Bacterial Production of Fatty Acids under Anaerobic Conditions.

Javidpour, P.Pereira, J.H.Goh, E.B.McAndrew, R.P.Ma, S.M.Friedland, G.D.Keasling, J.D.Chhabra, S.R.Adams, P.D.Beller, H.R.

(2014) Appl Environ Microbiol 80: 497-505

  • DOI: 10.1128/AEM.03194-13
  • Primary Citation of Related Structures:  
    4NBT, 4NBU, 4NBV, 4NBW

  • PubMed Abstract: 
  • Major efforts in bioenergy research have focused on producing fuels that can directly replace petroleum-derived gasoline and diesel fuel through metabolic engineering of microbial fatty acid biosynthetic pathways. Typically, growth and pathway induct ...

    Major efforts in bioenergy research have focused on producing fuels that can directly replace petroleum-derived gasoline and diesel fuel through metabolic engineering of microbial fatty acid biosynthetic pathways. Typically, growth and pathway induction are conducted under aerobic conditions, but for operational efficiency in an industrial context, anaerobic culture conditions would be preferred to obviate the need to maintain specific dissolved oxygen concentrations and to maximize the proportion of reducing equivalents directed to biofuel biosynthesis rather than ATP production. A major concern with fermentative growth conditions is elevated NADH levels, which can adversely affect cell physiology. The purpose of this study was to identify homologs of Escherichia coli FabG, an essential reductase involved in fatty acid biosynthesis, that display a higher preference for NADH than for NADPH as a cofactor. Four potential NADH-dependent FabG variants were identified through bioinformatic analyses supported by crystallographic structure determination (1.3- to 2.0-Å resolution). In vitro assays of cofactor (NADH/NADPH) preference in the four variants showed up to ≈ 35-fold preference for NADH, which was observed with the Cupriavidus taiwanensis FabG variant. In addition, FabG homologs were overexpressed in fatty acid- and methyl ketone-overproducing E. coli host strains under anaerobic conditions, and the C. taiwanensis variant led to a 60% higher free fatty acid titer and 75% higher methyl ketone titer relative to the titers of the control strains. With further engineering, this work could serve as a starting point for establishing a microbial host strain for production of fatty acid-derived biofuels (e.g., methyl ketones) under anaerobic conditions.


    Organizational Affiliation

    Joint BioEnergy Institute, Emeryville, California, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
3-oxoacyl-[acyl-carrier-protein] reductaseABCD240Acholeplasma laidlawii PG-8AMutation(s): 0 
Gene Names: fabG2ACL_0504
EC: 1.1.1.100
Find proteins for A9NFJ2 (Acholeplasma laidlawii (strain PG-8A))
Explore A9NFJ2 
Go to UniProtKB:  A9NFJ2
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAD
Query on NAD

Download CCD File 
A, B, C, D
NICOTINAMIDE-ADENINE-DINUCLEOTIDE
C21 H27 N7 O14 P2
BAWFJGJZGIEFAR-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.154 
  • R-Value Work: 0.128 
  • R-Value Observed: 0.129 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.968α = 66.03
b = 62.364β = 76.63
c = 66.765γ = 79.93
Software Package:
Software NamePurpose
BOSdata collection
PHENIXmodel building
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-12-04
    Type: Initial release
  • Version 1.1: 2014-01-15
    Changes: Database references
  • Version 1.2: 2014-12-10
    Changes: Other