Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 37.28 kDa 
• Atom Count: 2460 
• Modelled Residue Count: 298 
• Deposited Residue Count: 319 
• Unique protein chains: 1

1WA6

The structure of ACC oxidase

• DOI: 10.2210/pdb1WA6/pdb

• Classification: OXGENASE
• Organism(s): Petunia x hybrida
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2004-10-25 Released: 2005-10-26 
• Deposition Author(s): Zhang, Z., Ren, J.-S., Clifton, I.J., Schofield, C.J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.236 
• R-Value Work: 0.186 
• R-Value Observed: 0.189 

Literature

Crystal Structure and Mechanistic Implications of 1-Aminocyclopropane-1-Carboxylic Acid Oxidase (the Ethyling Forming Enzyme)

Zhang, Z., Ren, J.-S., Clifton, I.J., Schofield, C.J.

(2004) Chem Biol 11: 1383

• PubMed: 15489165 
• DOI: 10.1016/j.chembiol.2004.08.012
• Primary Citation of Related Structures:  
  1W9Y, 1WA6


• PubMed Abstract: 
  

The final step in the biosynthesis of the plant signaling molecule ethylene is catalyzed by 1-aminocyclopropane-1-carboxylic acid oxidase (ACCO). ACCO requires bicarbonate as an activator and catalyzes the oxidation of ACC to give ethylene, CO2, and HCN. We report crystal structures of ACCO in apo-form (2.1 A resolution) and complexed with Fe(II) (2.55 A) or Co(II) (2.4 A). The active site contains a single Fe(II) ligated by three residues (His177, Asp179, and His234), and it is relatively open compared to those of the 2-oxoglutarate oxygenases. The side chains of Arg175 and Arg244, proposed to be involved in binding bicarbonate, project away from the active site, but conformational changes may allow either or both to enter the active site. The structures will form a basis for future mechanistic and inhibition studies.

---

Organizational Affiliation: 

The Oxford Centre for Molecular Sciences, The Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
1-AMINOCYCLOPROPANE-1-CARBOXYLATE OXIDASE 1	A [auth X]	319	Petunia x hybrida	Mutation(s): 0  Gene Names: ACO1 EC: 1.14.17.4
UniProt
Find proteins for Q08506 (Petunia hybrida) Explore Q08506  Go to UniProtKB:  Q08506

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	E [auth X]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
PO4	C [auth X], D [auth X]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
FE2	B [auth X]	FE (II) ION Fe CWYNVVGOOAEACU-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A [auth X]	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.55 Å
• R-Value Free: 0.236 
• R-Value Work: 0.186 
• R-Value Observed: 0.189 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.34	α = 90
b = 107.06	β = 90
c = 108.38	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-10-25 
• Released Date: 2005-10-26 
Deposition Author(s): Zhang, Z., Ren, J.-S., Clifton, I.J., Schofield, C.J.

Revision History  

• Version 1.0: 2005-10-26
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance