1ECP

PURINE NUCLEOSIDE PHOSPHORYLASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The crystal structure of Escherichia coli purine nucleoside phosphorylase: a comparison with the human enzyme reveals a conserved topology.

Mao, C.Cook, W.J.Zhou, M.Koszalka, G.W.Krenitsky, T.A.Ealick, S.E.

(1997) Structure 5: 1373-1383

  • DOI: 10.1016/s0969-2126(97)00287-6
  • Primary Citation of Related Structures:  
    1ECP

  • PubMed Abstract: 
  • Purine nucleoside phosphorylase (PNP) from Escherichia coli is a hexameric enzyme that catalyzes the reversible phosphorolysis of 6-amino and 6-oxopurine (2'-deoxy)ribonucleosides to the free base and (2'-deoxy)ribose-1-phosphate. In contrast, human and bovine PNPs are trimeric and accept only 6-oxopurine nucleosides as substrates ...

    Purine nucleoside phosphorylase (PNP) from Escherichia coli is a hexameric enzyme that catalyzes the reversible phosphorolysis of 6-amino and 6-oxopurine (2'-deoxy)ribonucleosides to the free base and (2'-deoxy)ribose-1-phosphate. In contrast, human and bovine PNPs are trimeric and accept only 6-oxopurine nucleosides as substrates. The difference in the specificities of these two enzymes has been utilized in gene therapy treatments in which certain prodrugs are cleaved by E. coli PNP but not the human enzyme. The trimeric and hexameric PNPs show no similarity in amino acid sequence, even though they catalyze the same basic chemical reaction. Structural comparison of the active sites of mammalian and E. coli PNPs would provide an improved basis for the design of potential prodrugs that are specific for E. coli PNP.


    Organizational Affiliation

    Section of Biochemistry, Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PURINE NUCLEOSIDE PHOSPHORYLASEA, B, C, D, E, F238Escherichia coli K-12Mutation(s): 0 
Gene Names: deoDpupb4384JW4347
EC: 2.4.2.1
UniProt
Find proteins for P0ABP8 (Escherichia coli (strain K12))
Explore P0ABP8 
Go to UniProtKB:  P0ABP8
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.200 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.5α = 90
b = 110.6β = 111.7
c = 74.6γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

  • Deposited Date: 1995-07-13 
  • Released Date: 1996-06-20 
  • Deposition Author(s): Mao, C., Ealick, S.E.

Revision History  (Full details and data files)

  • Version 1.0: 1996-06-20
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance