Biological Assembly 1  

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

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Hetero 8-mer - A4B4 

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

Macromolecule Content

• Total Structure Weight: 274.25 kDa 
• Atom Count: 16162 
• Modelled Residue Count: 2030 
• Deposited Residue Count: 2500 
• Unique protein chains: 2

4HR7

Crystal Structure of Biotin Carboxyl Carrier Protein-Biotin Carboxylase Complex from E.coli

• PDB DOI: 10.2210/pdb4HR7/pdb

• Classification: LIGASE/BIOTIN BINDING PROTEIN
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2012-10-26 Released: 2013-03-13 
• Deposition Author(s): Broussard, T.C., Kobe, M.J., Pakhomova, S., Neau, D.B., Price, A.E., Champion, T.S., Waldrop, G.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.229 
• R-Value Work: 0.195 
• R-Value Observed: 0.197 

Literature

The three-dimensional structure of the biotin carboxylase-biotin carboxyl carrier protein complex of E. coli acetyl-CoA carboxylase.

Broussard, T.C., Kobe, M.J., Pakhomova, S., Neau, D.B., Price, A.E., Champion, T.S., Waldrop, G.L.

(2013) Structure 21: 650-657

• PubMed: 23499019 
• DOI: 10.1016/j.str.2013.02.001
• Primary Citation of Related Structures:  
  4HR7


• PubMed Abstract: 
  

Acetyl-coenzyme A (acetyl-CoA) carboxylase is a biotin-dependent, multifunctional enzyme that catalyzes the regulated step in fatty acid synthesis. The Escherichia coli enzyme is composed of a homodimeric biotin carboxylase (BC), biotinylated biotin carboxyl carrier protein (BCCP), and an α2β2 heterotetrameric carboxyltransferase. This enzyme complex catalyzes two half-reactions to form malonyl-coenzyme A. BC and BCCP participate in the first half-reaction, whereas carboxyltransferase and BCCP are involved in the second. Three-dimensional structures have been reported for the individual subunits; however, the structural basis for how BCCP reacts with the carboxylase or transferase is unknown. Therefore, we report here the crystal structure of E. coli BCCP complexed with BC to a resolution of 2.49 Å. The protein-protein complex shows a unique quaternary structure and two distinct interfaces for each BCCP monomer. These BCCP binding sites are unique compared to phylogenetically related biotin-dependent carboxylases and therefore provide novel targets for developing antibiotics against bacterial acetyl-CoA carboxylase.

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Organizational Affiliation: 

Division of Biochemistry and Molecular Biology, Louisiana State University, Baton Rouge, LA 70803, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Biotin carboxylase	A, C, E, F	449	Escherichia coli K-12	Mutation(s): 0  Gene Names: accC, fabG, b3256, JW3224 EC: 6.3.4.14 (PDB Primary Data), 6.4.1.2 (PDB Primary Data)
UniProt
Find proteins for P24182 (Escherichia coli (strain K12)) Explore P24182  Go to UniProtKB:  P24182

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Biotin carboxyl carrier protein of acetyl-CoA carboxylase	B, D, G, H [auth I]	176	Escherichia coli K-12	Mutation(s): 0  Gene Names: accB, fabE, b3255, JW3223
UniProt
Find proteins for P0ABD8 (Escherichia coli (strain K12)) Explore P0ABD8  Go to UniProtKB:  P0ABD8

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth C], O [auth C], Q [auth E], R [auth E], S [auth E], T [auth F], U [auth F]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
EDO	P [auth C]	1,2-ETHANEDIOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.229 
• R-Value Work: 0.195 
• R-Value Observed: 0.197 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 232.995	α = 90
b = 96.385	β = 120.15
c = 120.573	γ = 90

Software Package:

Software Name	Purpose
PHASER	phasing
PHENIX	refinement
XDS	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-10-26 
• Released Date: 2013-03-13 
Deposition Author(s): Broussard, T.C., Kobe, M.J., Pakhomova, S., Neau, D.B., Price, A.E., Champion, T.S., Waldrop, G.L.

Revision History  

• Version 1.0: 2013-03-13
  Type: Initial release
  
• Version 1.1: 2013-04-03
  Changes: Database references
• Version 1.2: 2013-05-29
  Changes: Database references