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3mb8

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<StructureSection load='3mb8' size='340' side='right'caption='[[3mb8]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
<StructureSection load='3mb8' size='340' side='right'caption='[[3mb8]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[3mb8]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Toxgo Toxgo]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3MB8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3MB8 FirstGlance]. <br>
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<table><tr><td colspan='2'>[[3mb8]] is a 2 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=3MB8 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3MB8 FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=IMH:1,4-DIDEOXY-4-AZA-1-(S)-(9-DEAZAHYPOXANTHIN-9-YL)-D-RIBITOL'>IMH</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PNP ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=5811 TOXGO])</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=IMH:1,4-DIDEOXY-4-AZA-1-(S)-(9-DEAZAHYPOXANTHIN-9-YL)-D-RIBITOL'>IMH</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr>
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<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Purine-nucleoside_phosphorylase Purine-nucleoside phosphorylase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.1 2.4.2.1] </span></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3mb8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mb8 OCA], [https://pdbe.org/3mb8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3mb8 RCSB], [https://www.ebi.ac.uk/pdbsum/3mb8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3mb8 ProSAT]</span></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=3mb8 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3mb8 OCA], [https://pdbe.org/3mb8 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3mb8 RCSB], [https://www.ebi.ac.uk/pdbsum/3mb8 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3mb8 ProSAT]</span></td></tr>
</table>
</table>
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<div style="background-color:#fffaf0;">
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== Function ==
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== Publication Abstract from PubMed ==
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[https://www.uniprot.org/uniprot/Q2HXR2_TOXGO Q2HXR2_TOXGO]
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The intracellular pathogen Toxoplasma gondii is a purine auxotroph that relies on purine salvage for proliferation. We have optimized T. gondii purine nucleoside phosphorylase (TgPNP) stability and crystallized TgPNP with phosphate and Immucillin-H, a transition-state analogue that has high affinity for the enzyme. Immucillin-H bound to TgPNP with a dissociation constant of 370 pM, the highest affinity of eleven immucillins selected to probe the catalytic site. The specificity for transition-state analogues indicated an early dissociative transition state for TgPNP. Compared with PfPNP, large substituents surrounding the 5' -hydroxyl group of inhibitors demonstrate reduced capacity for TgPNP inhibition. Catalytic discrimination against large 5' groups is consistent with the inability of TgPNP to catalyze the phosphorylysis of 5' -methylthioinosine to hypoxanthine. In contrast to mammalian PNP, the 2' -hydroxyl group is crucial for inhibitor binding in the catalytic site of TgPNP. This first crystal structure of TgPNP describes the basis for discrimination against 5' -methylthioinosine and similarly 5' -hydroxy-substituted immucillins; structural differences reflect the unique adaptations of purine salvage pathways of Apicomplexa.
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INHIBITION AND STRUCTURE OF TOXOPLASMA GONDII PURINE NUCLEOSIDE PHOSPHORYLASE.,Donaldson TM, Cassera MB, Ho MC, Zhan C, Merino EF, Evans GB, Tyler PC, Almo SC, Schramm VL, Kim K Eukaryot Cell. 2014 Feb 28. PMID:24585883<ref>PMID:24585883</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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<div class="pdbe-citations 3mb8" style="background-color:#fffaf0;"></div>
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==See Also==
==See Also==
*[[Purine nucleoside phosphorylase 3D structures|Purine nucleoside phosphorylase 3D structures]]
*[[Purine nucleoside phosphorylase 3D structures|Purine nucleoside phosphorylase 3D structures]]
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== References ==
 
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<references/>
 
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
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[[Category: Purine-nucleoside phosphorylase]]
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[[Category: Toxoplasma gondii]]
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[[Category: Toxgo]]
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[[Category: Almo SC]]
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[[Category: Almo, S C]]
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[[Category: Ho M]]
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[[Category: Ho, M]]
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[[Category: Schramm VL]]
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[[Category: Schramm, V L]]
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[[Category: Immh]]
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[[Category: Immucillin h]]
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[[Category: Pnp]]
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[[Category: Purine nucleoside phosphorylase]]
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[[Category: Transferase]]
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Revision as of 08:47, 7 February 2024

Crystal structure of purine nucleoside phosphorylase from toxoplasma gondii in complex with immucillin-H

PDB ID 3mb8

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