Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly 2  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 177.1 kDa 
• Atom Count: 12,770 
• Modelled Residue Count: 1,624 
• Deposited Residue Count: 1,672 
• Unique protein chains: 1

 1EK4

BETA-KETOACYL [ACYL CARRIER PROTEIN] SYNTHASE I IN COMPLEX WITH DODECANOIC ACID TO 1.85 RESOLUTION

• PDB DOI: 10.2210/pdb1EK4/pdb

• Classification: TRANSFERASE
• Organism(s): Escherichia coli
• Mutation(s): Yes 


• Deposited: 2000-03-06 Released: 2001-04-11 
• Deposition Author(s): Olsen, J.G., Kadziola, A., Siggaard-Andersen, M., von Wettstein-Knowles, P., Larsen, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.196 
• R-Value Work: 0.173 

Literature

Structures of beta-ketoacyl-acyl carrier protein synthase I complexed with fatty acids elucidate its catalytic machinery.

Olsen, J.G., Kadziola, A., von Wettstein-Knowles, P., Siggaard-Andersen, M., Larsen, S.

(2001) Structure 9: 233-243

• PubMed: 11286890 
• DOI: 10.1016/s0969-2126(01)00583-4
• Primary Citation of Related Structures:  
  1EK4, 1F91


• PubMed Abstract: 
  

beta-ketoacyl-acyl carrier protein synthase (KAS) I is vital for the construction of the unsaturated fatty acid carbon skeletons characterizing E. coli membrane lipids. The new carbon-carbon bonds are created by KAS I in a Claisen condensation performed in a three-step enzymatic reaction. KAS I belongs to the thiolase fold enzymes, of which structures are known for five other enzymes.

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Related Citations: 

• The X-ray crystal structure of beta-ketoacyl [acyl carrier protein] synthase I
  Olsen, J.G., Kadziola, A., von Wettstein-Knowles, P., Siggaard-Andersen, M., Lindquist, Y., Larsen, S.
  (1999) FEBS Lett 460: 46

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Organizational Affiliation: 

Centre for Crystallographic Studies, University of Copenhagen, DK-2100, Denmark.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA-KETOACYL [ACYL CARRIER PROTEIN] SYNTHASE I	A, B, C, D	418	Escherichia coli	Mutation(s): 1  EC: 2.3.1.41
UniProt
Find proteins for P0A953 (Escherichia coli (strain K12)) Explore P0A953  Go to UniProtKB:  P0A953

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
DAO	E [auth A], F [auth B], G [auth C], H [auth D]	LAURIC ACID C12 H24 O2 POULHZVOKOAJMA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.85 Å
• R-Value Free: 0.196 
• R-Value Work: 0.173 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.64	α = 90
b = 142.26	β = 90
c = 213.74	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
MAR345	data collection
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-04-11 
Deposition Author(s): Olsen, J.G., Kadziola, A., Siggaard-Andersen, M., von Wettstein-Knowles, P., Larsen, S.

Revision History  

• Version 1.0: 2001-04-11
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-04
  Changes: Data collection, Refinement description
• Version 1.4: 2018-02-14
  Changes: Experimental preparation
• Version 1.5: 2018-03-14
  Changes: Database references
• Version 1.6: 2021-11-03
  Changes: Database references, Derived calculations