Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | 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: 89.37 kDa 
• Atom Count: 6451 
• Modelled Residue Count: 751 
• Deposited Residue Count: 804 
• Unique protein chains: 1

1EE0

2-PYRONE SYNTHASE COMPLEXED WITH ACETOACETYL-COA

• PDB DOI: 10.2210/pdb1EE0/pdb

• Classification: TRANSFERASE
• Organism(s): Gerbera hybrid cultivar
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2000-01-28 Released: 2001-01-31 
• Deposition Author(s): Jez, J.M., Austin, M.B., Ferrer, J., Bowmann, M.E., Schroeder, J., Noel, J.P.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.243 
• R-Value Work: 0.189 

Literature

Structural control of polyketide formation in plant-specific polyketide synthases.

Jez, J.M., Austin, M.B., Ferrer, J., Bowman, M.E., Schroder, J., Noel, J.P.

(2000) Chem Biol 7: 919-930

• PubMed: 11137815 
• DOI: 10.1016/s1074-5521(00)00041-7
• Primary Citation of Related Structures:  
  1EE0


• PubMed Abstract: 
  

Polyketide synthases (PKSs) generate molecular diversity by utilizing different starter molecules and by controlling the final length of the polyketide. Although exploitation of this mechanistic variability has produced novel polyketides, the structural foundation of this versatility is unclear. Plant-specific PKSs are essential for the biosynthesis of anti-microbial phytoalexins, anthocyanin floral pigments, and inducers of Rhizobium nodulation genes. 2-Pyrone synthase (2-PS) and chalcone synthase (CHS) are plant-specific PKSs that share 74% amino acid sequence identity. 2-PS forms the triketide methylpyrone from an acetyl-CoA starter molecule and two malonyl-CoAs. CHS uses a p-coumaroyl-CoA starter molecule and three malonyl-CoAs to produce the tetraketide chalcone. Our goal was to elucidate the molecular basis of starter molecule selectivity and control of polyketide length in this class of PKS.

---

Organizational Affiliation: 

Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
2-PYRONE SYNTHASE	A, B	402	Gerbera hybrid cultivar	Mutation(s): 1  Gene Names: 2PS, CHS2 EC: 2.3.1.74 (PDB Primary Data), 2.3.1 (UniProt)
UniProt
Find proteins for P48391 (Gerbera hybrida) Explore P48391  Go to UniProtKB:  P48391

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CAA	C [auth A], D [auth B]	ACETOACETYL-COENZYME A C25 H40 N7 O18 P3 S OJFDKHTZOUZBOS-CITAKDKDSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSD	A, B	L-PEPTIDE LINKING	C3 H7 N O4 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.05 Å
• R-Value Free: 0.243 
• R-Value Work: 0.189 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 83.406	α = 90
b = 83.406	β = 90
c = 240.625	γ = 120

Software Package:

Software Name	Purpose
EPMR	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-01-28 
• Released Date: 2001-01-31 
Deposition Author(s): Jez, J.M., Austin, M.B., Ferrer, J., Bowmann, M.E., Schroeder, J., Noel, J.P.

Revision History  

• Version 1.0: 2001-01-31
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance