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[[Image:1bd3.gif|left|200px]]<br /><applet load="1bd3" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1bd3, resolution 1.93&Aring;" />
'''STRUCTURE OF THE APO URACIL PHOSPHORIBOSYLTRANSFERASE, 2 MUTANT C128V'''<br />


==Overview==
==STRUCTURE OF THE APO URACIL PHOSPHORIBOSYLTRANSFERASE, 2 MUTANT C128V==
Uracil phosphoribosyltransferase (UPRTase) catalyzes the transfer of a ribosyl phosphate group from alpha-D-5-phosphoribosyl-1-pyrophosphate to the N1 nitrogen of uracil. The UPRTase from the opportunistic pathogen Toxoplasma gondii is a rational target for antiparasitic drug design. To aid in structure-based drug design studies against toxoplasmosis, the crystal structures of the T.gondii apo UPRTase (1.93 A resolution), the UPRTase bound to its substrate, uracil (2.2 A resolution), its product, UMP (2.5 A resolution), and the prodrug, 5-fluorouracil (2.3 A resolution), have been determined. These structures reveal that UPRTase recognizes uracil through polypeptide backbone hydrogen bonds to the uracil exocyclic O2 and endocyclic N3 atoms and a backbone-water-exocyclic O4 oxygen hydrogen bond. This stereochemical arrangement and the architecture of the uracil-binding pocket reveal why cytosine and pyrimidines with exocyclic substituents at ring position 5 larger than fluorine, including thymine, cannot bind to the enzyme. Strikingly, the T. gondii UPRTase contains a 22 residue insertion within the conserved PRTase fold that forms an extended antiparallel beta-arm. Leu92, at the tip of this arm, functions to cap the active site of its dimer mate, thereby inhibiting the escape of the substrate-binding water molecule.
<StructureSection load='1bd3' size='340' side='right'caption='[[1bd3]], [[Resolution|resolution]] 1.93&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1bd3]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Toxoplasma_gondii Toxoplasma gondii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BD3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BD3 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]] 1.93&#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></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=1bd3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1bd3 OCA], [https://pdbe.org/1bd3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1bd3 RCSB], [https://www.ebi.ac.uk/pdbsum/1bd3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1bd3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/UPP_TOXGO UPP_TOXGO] Catalyzes the conversion of uracil and 5-phospho-alpha-D-ribose 1-diphosphate (PRPP) to UMP and diphosphate.<ref>PMID:9247925</ref>
== 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/bd/1bd3_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=1bd3 ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1BD3 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Toxoplasma_gondii Toxoplasma gondii] with <scene name='pdbligand=PO4:'>PO4</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Uracil_phosphoribosyltransferase Uracil phosphoribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.9 2.4.2.9] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BD3 OCA].
*[[Phosphoribosyltransferase 3D structures|Phosphoribosyltransferase 3D structures]]
 
== References ==
==Reference==
<references/>
Crystal structures of Toxoplasma gondii uracil phosphoribosyltransferase reveal the atomic basis of pyrimidine discrimination and prodrug binding., Schumacher MA, Carter D, Scott DM, Roos DS, Ullman B, Brennan RG, EMBO J. 1998 Jun 15;17(12):3219-32. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9628859 9628859]
__TOC__
[[Category: Single protein]]
</StructureSection>
[[Category: Large Structures]]
[[Category: Toxoplasma gondii]]
[[Category: Toxoplasma gondii]]
[[Category: Uracil phosphoribosyltransferase]]
[[Category: Brennan RG]]
[[Category: Brennan, R G.]]
[[Category: Carter D]]
[[Category: Carter, D.]]
[[Category: Roos D]]
[[Category: Roos, D.]]
[[Category: Schumacher MA]]
[[Category: Schumacher, M A.]]
[[Category: Scott D]]
[[Category: Scott, D.]]
[[Category: Ullman B]]
[[Category: Ullman, B.]]
[[Category: PO4]]
[[Category: glycosyltransferase]]
[[Category: transferase]]
[[Category: uprtase]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:53:59 2008''

Latest revision as of 06:35, 7 February 2024

STRUCTURE OF THE APO URACIL PHOSPHORIBOSYLTRANSFERASE, 2 MUTANT C128V

1bd3, resolution 1.93Å

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