View source for 8oi9


==Trichomonas vaginalis riboside hydrolase in complex with 5-methyluridine==
<StructureSection load='8oi9' size='340' side='right'caption='[[8oi9]], [[Resolution|resolution]] 1.95&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8oi9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Trichomonas_vaginalis Trichomonas vaginalis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8OI9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8OI9 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]] 1.95&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=38T:5-METHYLURIDINE'>38T</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=PIN:PIPERAZINE-N,N-BIS(2-ETHANESULFONIC+ACID)'>PIN</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=8oi9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8oi9 OCA], [https://pdbe.org/8oi9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8oi9 RCSB], [https://www.ebi.ac.uk/pdbsum/8oi9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8oi9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/A2FTT0_TRIV3 A2FTT0_TRIV3] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Pathogenic parasites of the Trichomonas genus are causative agents of sexually-transmitted diseases affecting millions of individuals worldwide and whose outcome may include stillbirths and enhanced cancer risks and susceptibility to HIV infection. Trichomonas vaginalis relies on imported purine and pyrimidine nucleosides and nucleobases for survival, since it lacks the enzymatic activities necessary for de novo biosynthesis. Here we show that T. vaginalis additionally lacks homologues of the bacterial or mammalian enzymes required for the synthesis of the nicotinamide ring, crucial component in the redox cofactors NAD(+) and NADP. Moreover, we show that a yet fully uncharacterized T. vaginalis protein homologous to bacterial and protozoan nucleoside hydrolases (NHs) is active as a pyrimidine nucleosidase, but shows the highest specificity towards the NAD(+) metabolite nicotinamide riboside. Crystal structures of the trichomonal riboside hydrolase in different states reveals novel intermediates along the NH-catalyzed hydrolytic reaction, including an unexpected asymmetry in the homotetrameric assembly. The active site structure explains the broad specificity towards different ribosides, and offers precise insights for the engineering of specific inhibitors that may simultaneously target different essential pathways in the parasite.

A riboside hydrolase that salvages both nucleobases and nicotinamide in the auxotrophic parasite Trichomonas vaginalis.,Patrone M, Galasyn GS, Kerin F, Nyitray MM, Parkin DW, Stockman BJ, Degano M J Biol Chem. 2023 Jul 21:105077. doi: 10.1016/j.jbc.2023.105077. PMID:37482279<ref>PMID:37482279</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 8oi9" style="background-color:#fffaf0;"></div>
== References ==
<references/>
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</StructureSection>
[[Category: Large Structures]]
[[Category: Trichomonas vaginalis]]
[[Category: Degano M]]
[[Category: Patrone M]]
[[Category: Stockman BJ]]