1z34: Difference between revisions

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-[[Image:1z34.png|left|200px]]
+==Crystal structure of Trichomonas vaginalis purine nucleoside phosphorylase complexed with 2-fluoro-2'-deoxyadenosine==
+<StructureSection load='1z34' size='340' side='right' caption='[[1z34]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[1z34]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Trichomonas_vaginalis Trichomonas vaginalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Z34 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1Z34 FirstGlance]. <br>
+</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=2FD:5-(6-AMINO-2-FLUORO-PURIN-9-YL)-2-HYDROXYMETHYL-TETRAHYDRO-FURAN-3-OL'>2FD</scene><br>
+<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1z33|1z33]], [[1z35|1z35]], [[1z36|1z36]], [[1z37|1z37]], [[1z38|1z38]], [[1z39|1z39]]</td></tr>
+<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Purine-nucleoside_phosphorylase Purine-nucleoside phosphorylase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.1 2.4.2.1] </span></td></tr>
+<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1z34 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1z34 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1z34 RCSB], [http://www.ebi.ac.uk/pdbsum/1z34 PDBsum]</span></td></tr>
+<table>
+== 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/z3/1z34_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/chain_selection.php?pdb_ID=2ata ConSurf].
+<div style="clear:both"></div>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+Trichomonas vaginalis is an anaerobic protozoan parasite that causes trichomoniasis, a common sexually transmitted disease with worldwide impact. One of the pivotal enzymes in its purine salvage pathway, purine nucleoside phosphorylase (PNP), shows physical properties and substrate specificities similar to those of the high molecular mass bacterial PNPs but differing from those of human PNP. While carrying out studies to identify inhibitors of T. vaginalis PNP (TvPNP), we discovered that the nontoxic nucleoside analogue 2-fluoro-2'-deoxyadenosine (F-dAdo) is a "subversive substrate." Phosphorolysis by TvPNP of F-dAdo, which is not a substrate for human PNP, releases highly cytotoxic 2-fluoroadenine (F-Ade). In vitro studies showed that both F-dAdo and F-Ade exert strong inhibition of T. vaginalis growth with estimated IC(50) values of 106 and 84 nm, respectively, suggesting that F-dAdo might be useful as a potential chemotherapeutic agent against T. vaginalis. To understand the basis of TvPNP specificity, the structures of TvPNP complexed with F-dAdo, 2-fluoroadenosine, formycin A, adenosine, inosine, or 2'-deoxyinosine were determined by x-ray crystallography with resolutions ranging from 2.4 to 2.9 A. These studies showed that the quaternary structure, monomer fold, and active site are similar to those of Escherichia coli PNP. The principal active site difference is at Thr-156, which is alanine in E. coli PNP. In the complex of TvPNP with F-dAdo, Thr-156 causes the purine base to tilt and shift by 0.5 A as compared with the binding scheme of F-dAdo in E. coli PNP. The structures of the TvPNP complexes suggest opportunities for further improved subversive substrates beyond F-dAdo.
-{{STRUCTURE_1z34|  PDB=1z34  |  SCENE=  }}
+Identification of a subversive substrate of Trichomonas vaginalis purine nucleoside phosphorylase and the crystal structure of the enzyme-substrate complex.,Zang Y, Wang WH, Wu SW, Ealick SE, Wang CC J Biol Chem. 2005 Jun 10;280(23):22318-25. Epub 2005 Apr 7. PMID:15817485<ref>PMID:15817485</ref>
-===Crystal structure of Trichomonas vaginalis purine nucleoside phosphorylase complexed with 2-fluoro-2'-deoxyadenosine===
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
-{{ABSTRACT_PUBMED_15817485}}
+==See Also==
+*[[Purine nucleoside phosphorylase|Purine nucleoside phosphorylase]]
-==About this Structure==
+== References ==
-[[1z34]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Trichomonas_vaginalis Trichomonas vaginalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Z34 OCA].
+<references/>
+__TOC__
-==Reference==
+</StructureSection>
-<ref group="xtra">PMID:015817485</ref><references group="xtra"/>
 [[Category: Purine-nucleoside phosphorylase]]
 [[Category: Trichomonas vaginalis]]