Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Dihedral - D3  (3D View)
Global Stoichiometry: Homo 6-mer - A6 

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

Macromolecule Content

• Total Structure Weight: 78486.84 
• Atom Count: 5446 
• Residue Count: 714 
• Unique protein chains: 1

1OUM

M64V PNP +Talo

• DOI: 10.2210/pdb1OUM/pdb

• Classification: TRANSFERASE
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 2003-03-24 Released: 2004-02-17 
• Deposition Author(s): Ealick, S.E., Bennett, E.M., Anand, R., Secrist, J.A., Parker, W.B., Hassan, A.E., Allan, P.W., McPherson, D.T., Sorscher, E.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.260 
• R-Value Work: 0.228 

Literature

Designer gene therapy using an Escherichia coli purine nucleoside phosphorylase/prodrug system.

Bennett, E.M., Anand, R., Allan, P.W., Hassan, A.E., Hong, J.S., Levasseur, D.N., McPherson, D.T., Parker, W.B., Secrist, J.A., Sorscher, E.J., Townes, T.M., Waud, W.R., Ealick, S.E.

(2003) Chem.Biol. 10: 1173-1181

• PubMed: 14700625 
• Primary Citation of Related Structures:  
  1OVG, 1OV6, 1OU4, 1OTY, 1OTX


• PubMed Abstract: 
  

Activation of prodrugs by Escherichia coli purine nucleoside phosphorylase (PNP) provides a method for selectively killing tumor cells expressing a transfected PNP gene. This gene therapy approach requires matching a prodrug and a known enzymatic activity present only in tumor cells. The specificity of the method relies on avoiding prodrug cleavage by enzymes already present in the host cells or the intestinal flora. Using crystallographic and computer modeling methods as guides, we have redesigned E. coli PNP to cleave new prodrug substrates more efficiently than does the wild-type enzyme. In particular, the M64V PNP mutant cleaves 9-(6-deoxy-alpha-L-talofuranosyl)-6-methylpurine with a kcat/Km over 100 times greater than for native E. coli PNP. In a xenograft tumor experiment, this compound caused regression of tumors expressing the M64V PNP gene.

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Organizational Affiliation: 

Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Purine nucleoside phosphorylase	A, B, C	238	Escherichia coli (strain K12)	Mutation(s): 1  Gene Names: deoD (pup) EC: 2.4.2.1
Find proteins for P0ABP8 (Escherichia coli (strain K12)) Go to UniProtKB:  P0ABP8

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
PO4	B, C	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
TAL	A, B, C	9-(6-DEOXY-ALPHA-L-TALOFURANOSYL)-6-METHYLPURINE C12 H16 N4 O4 XJZDIUOABWMPLZ-DSBXBFMBSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.260 
• R-Value Work: 0.228 
• Space Group: P 6₁ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 120.940	α = 90.00
b = 120.940	β = 90.00
c = 241.780	γ = 120.00

Software Package:

Software Name	Purpose
MOSFLM	data reduction
CNS	refinement
CNS	phasing
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-03-24 
• Released Date: 2004-02-17 
• Deposition Author(s): Ealick, S.E., Bennett, E.M., Anand, R., Secrist, J.A., Parker, W.B., Hassan, A.E., Allan, P.W., McPherson, D.T., Sorscher, E.J.

Revision History 

• Version 1.0: 2004-02-17
  Type: Initial release
• Version 1.1: 2008-04-29
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Derived calculations, Version format compliance