Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 111.67 kDa 
• Atom Count: 8527 
• Modelled Residue Count: 970 
• Deposited Residue Count: 1000 
• Unique protein chains: 1

4NBU

Crystal structure of FabG from Bacillus sp

• PDB DOI: 10.2210/pdb4NBU/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Bacillus sp. SG-1
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2013-10-23 Released: 2013-12-04 
• Deposition Author(s): Pereira, J.H., Mcandrew, R.P., Javidpour, P., Beller, H.R., Adams, P.D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.34 Å
• R-Value Free: 0.164 
• R-Value Work: 0.156 
• R-Value Observed: 0.156 

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

• PubMed: 24212572 
• 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 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.

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Organizational Affiliation: 

Joint BioEnergy Institute, Emeryville, California, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
3-oxoacyl-(Acyl-carrier-protein) reductase	A, B, C, D	250	Bacillus sp. SG-1	Mutation(s): 0  Gene Names: BSG1_13201
UniProt
Find proteins for A6CQL2 (Bacillus sp. SG-1) Explore A6CQL2  Go to UniProtKB:  A6CQL2

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CAA	G [auth B]	ACETOACETYL-COENZYME A C25 H40 N7 O18 P3 S OJFDKHTZOUZBOS-CITAKDKDSA-N
NAI	E [auth A], F [auth B], H [auth C], I [auth D]	1,4-DIHYDRONICOTINAMIDE ADENINE DINUCLEOTIDE C21 H29 N7 O14 P2 BOPGDPNILDQYTO-NNYOXOHSSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.34 Å
• R-Value Free: 0.164 
• R-Value Work: 0.156 
• R-Value Observed: 0.156 
• Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.412	α = 67.85
b = 68.774	β = 88.65
c = 70	γ = 62.64

Software Package:

Software Name	Purpose
BOS	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-10-23 
• Released Date: 2013-12-04 
Deposition Author(s): Pereira, J.H., Mcandrew, R.P., Javidpour, P., Beller, H.R., Adams, P.D.

Revision History  

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