Biological Assembly 1  

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

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

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

Macromolecule Content

• Total Structure Weight: 42.72 kDa 
• Atom Count: 2887 
• Modelled Residue Count: 364 
• Deposited Residue Count: 396 
• Unique protein chains: 1

1ZZ6

Crystal Structure of Apo-HppE

• PDB DOI: 10.2210/pdb1ZZ6/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Streptomyces wedmorensis
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2005-06-13 Released: 2005-07-26 
• Deposition Author(s): Higgins, L.J., Yan, F., Liu, P., Liu, H.W., Drennan, C.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.325 
• R-Value Work: 0.278 
• R-Value Observed: 0.278 

Literature

Structural insight into antibiotic fosfomycin biosynthesis by a mononuclear iron enzyme

Higgins, L.J., Yan, F., Liu, P., Liu, H.W., Drennan, C.L.

(2005) Nature 437: 838-844

• PubMed: 16015285 
• DOI: 10.1038/nature03924
• Primary Citation of Related Structures:  
  1ZZ6, 1ZZ7, 1ZZ8, 1ZZ9, 1ZZB, 1ZZC


• PubMed Abstract: 
  

The biosynthetic pathway of the clinically important antibiotic fosfomycin uses enzymes that catalyse reactions without precedent in biology. Among these is hydroxypropylphosphonic acid epoxidase, which represents a new subfamily of non-haem mononuclear iron enzymes. Here we present six X-ray structures of this enzyme: the apoenzyme at 2.0 A resolution; a native Fe(II)-bound form at 2.4 A resolution; a tris(hydroxymethyl)aminomethane-Co(II)-enzyme complex structure at 1.8 A resolution; a substrate-Co(II)-enzyme complex structure at 2.5 A resolution; and two substrate-Fe(II)-enzyme complexes at 2.1 and 2.3 A resolution. These structural data lead us to suggest how this enzyme is able to recognize and respond to its substrate with a conformational change that protects the radical-based intermediates formed during catalysis. Comparisons with other family members suggest why substrate binding is able to prime iron for dioxygen binding in the absence of alpha-ketoglutarate (a co-substrate required by many mononuclear iron enzymes), and how the unique epoxidation reaction of hydroxypropylphosphonic acid epoxidase may occur.

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Organizational Affiliation: 

Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Hydroxypropylphosphonic Acid Epoxidase	A, B	198	Streptomyces wedmorensis	Mutation(s): 0  Gene Names: fom4, hppE EC: 1.14 (PDB Primary Data), 1.11.1.23 (UniProt)
UniProt
Find proteins for Q56185 (Streptomyces wedmorensis) Explore Q56185  Go to UniProtKB:  Q56185

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.325 
• R-Value Work: 0.278 
• R-Value Observed: 0.278 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 89.09	α = 90
b = 89.09	β = 90
c = 163.62	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-06-13 
• Released Date: 2005-07-26 
Deposition Author(s): Higgins, L.J., Yan, F., Liu, P., Liu, H.W., Drennan, C.L.

Revision History  

• Version 1.0: 2005-07-26
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Derived calculations, Version format compliance