View source for 1pw7


==Crystal Structure of E. coli purine nucleoside phosphorylase complexed with 9-beta-D-arabinofuranosyladenine and sulfate/phosphate==
<StructureSection load='1pw7' size='340' side='right'caption='[[1pw7]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1pw7]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_O157:H7 Escherichia coli O157:H7]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PW7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PW7 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=RAB:2-(6-AMINO-PURIN-9-YL)-5-HYDROXYMETHYL-TETRAHYDRO-FURAN-3,4-DIOL'>RAB</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1pw7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pw7 OCA], [https://pdbe.org/1pw7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pw7 RCSB], [https://www.ebi.ac.uk/pdbsum/1pw7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pw7 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DEOD_ECO57 DEOD_ECO57] Cleavage of guanosine or inosine to respective bases and sugar-1-phosphate molecules.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/pw/1pw7_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1pw7 ConSurf].
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== Publication Abstract from PubMed ==
Purine nucleoside phosphorylase catalyzes reversible phosphorolysis of purine nucleosides and 2'-deoxypurine nucleosides to the free base and ribose (or 2'-deoxyribose) 1-phosphate. Whereas the human enzyme is specific for 6-oxopurine ribonucleosides, the Escherichia coli enzyme accepts additional substrates including 6-oxopurine ribonucleosides, 6-aminopurine ribonucleosides, and to a lesser extent purine arabinosides. These differences have been exploited in a potential suicide gene therapy treatment for solid tumors. In an effort to optimize this suicide gene therapy approach, we have determined the three-dimensional structure of the E. coli enzyme in complex with 10 nucleoside analogs and correlated the structures with kinetic measurements and computer modeling. These studies explain the preference of the enzyme for ribose sugars, show increased flexibility for active site residues Asp204 and Arg24, and suggest that interactions involving the 1- and 6-positions of the purine and the 4'- and 5'-positions of the ribose provide the best opportunities to increase prodrug specificity and enzyme efficiency.

Structural basis for substrate specificity of Escherichia coli purine nucleoside phosphorylase.,Bennett EM, Li C, Allan PW, Parker WB, Ealick SE J Biol Chem. 2003 Nov 21;278(47):47110-8. Epub 2003 Aug 21. PMID:12937174<ref>PMID:12937174</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1pw7" style="background-color:#fffaf0;"></div>

==See Also==
*[[Purine nucleoside phosphorylase 3D structures|Purine nucleoside phosphorylase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli O157:H7]]
[[Category: Large Structures]]
[[Category: Allan PW]]
[[Category: Bennett EM]]
[[Category: Ealick SE]]
[[Category: Li C]]
[[Category: Parker WB]]