Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 67.28 kDa 
• Atom Count: 5145 
• Residue Count: 634 
• Unique protein chains: 1

1HN9

CRYSTAL STRUCTURE OF BETA-KETOACYL-ACP SYNTHASE III

• DOI: 10.2210/pdb1HN9/pdb
• Entry: 1HN9 supersedes: 1D9B

• Classification: TRANSFERASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-12-07 Released: 2000-12-27 
• Deposition Author(s): Qiu, X., Janson, C.A., Konstantinidis, A.K., Nwagwu, S., Silverman, C., Smith, W.W., Khandekar, S.K., Lonsdale, J., Abdel-Meguid, S.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.218 
• R-Value Work: 0.177 

Literature

Crystal structure of beta-ketoacyl-acyl carrier protein synthase III. A key condensing enzyme in bacterial fatty acid biosynthesis.

Qiu, X., Janson, C.A., Konstantinidis, A.K., Nwagwu, S., Silverman, C., Smith, W.W., Khandekar, S., Lonsdale, J., Abdel-Meguid, S.S.

(1999) J Biol Chem 274: 36465-36471

• PubMed: 10593943 
• DOI: 10.1074/jbc.274.51.36465
• Primary Citation of Related Structures:  
  1HN9


• PubMed Abstract: 
  

Beta-ketoacyl-acyl carrier protein synthase III (FabH), the most divergent member of the family of condensing enzymes, is a key catalyst in bacterial fatty acid biosynthesis and a promising target for novel antibiotics. We report here the crystal structures of FabH determined in the presence and absence of acetyl-CoA. These structures display a fold that is common for condensing enzymes. The observed acetylation of Cys(112) proves its catalytic role and clearly defines the primer binding pocket. Modeling based on a bound CoA molecule suggests catalytic roles for His(244) and Asn(274). The structures provide the molecular basis for FabH substrate specificity and reaction mechanism and are important for structure-based design of novel antibiotics.

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Organizational Affiliation: 

SmithKline Beecham Pharmaceuticals, King of Prussia, Pennsylvania 19406, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA-KETOACYL-ACYL CARRIER PROTEIN SYNTHASE III	A, B	317	Escherichia coli	Mutation(s): 0  EC: 2.3.1.41 (PDB Primary Data), 2.3.1.180 (UniProt)
Find proteins for P0A6R0 (Escherichia coli (strain K12)) Explore P0A6R0  Go to UniProtKB:  P0A6R0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PO4	A, B	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.218 
• R-Value Work: 0.177 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.06	α = 90
b = 65.08	β = 90
c = 166.5	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-12-07 
• Released Date: 2000-12-27 
Deposition Author(s): Qiu, X., Janson, C.A., Konstantinidis, A.K., Nwagwu, S., Silverman, C., Smith, W.W., Khandekar, S.K., Lonsdale, J., Abdel-Meguid, S.S.
• This entry supersedes: 1D9B

Revision History 

• Version 1.0: 2000-12-27
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance