View source for 3e74


==Crystal structure of E. coli allantoinase with iron ions at the metal center==
<StructureSection load='3e74' size='340' side='right'caption='[[3e74]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3e74]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Ecoli Ecoli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3E74 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3E74 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=FE:FE+(III)+ION'>FE</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[3e75|3e75]]</div></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">allB, glxB3, ybbX, b0512, JW0500 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=83333 ECOLI])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Allantoinase Allantoinase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.2.5 3.5.2.5] </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=3e74 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3e74 OCA], [https://pdbe.org/3e74 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3e74 RCSB], [https://www.ebi.ac.uk/pdbsum/3e74 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3e74 ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/ALLB_ECOLI ALLB_ECOLI]] Catalyzes the conversion of allantoin (5-ureidohydantoin) to allantoic acid by hydrolytic cleavage of the five-member hydantoin ring.<ref>PMID:10601204</ref> <ref>PMID:11092864</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/e7/3e74_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=3e74 ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Allantoinase acts as a key enzyme for the biogenesis and degradation of ureides by catalyzing the conversion of (S)-allantoin into allantoate, the final step in the ureide pathway. Despite limited sequence similarity, biochemical studies of the enzyme suggested that allantoinase belongs to the amidohydrolase family. In this study, the crystal structure of allantoinase from Escherichia coli was determined at 2.1 A resolution. The enzyme consists of a homotetramer in which each monomer contains two domains: a pseudo-triosephosphate-isomerase barrel and a beta-sheet. Analogous to other enzymes in the amidohydrolase family, allantoinase retains a binuclear metal center in the active site, embedded within the barrel fold. Structural analyses demonstrated that the metal ions in the active site ligate one hydroxide and six residues that are conserved among allantoinases from other organisms. Functional analyses showed that the presence of zinc in the metal center is essential for catalysis and enantioselectivity of substrate. Both the metal center and active site residues Asn94 and Ser317 play crucial roles in dictating enzyme activity. These structural and functional features are distinctively different from those of the metal-independent allantoinase, which was very recently identified.

Crystal structure of metal-dependent allantoinase from Escherichia coli.,Kim K, Kim MI, Chung J, Ahn JH, Rhee S J Mol Biol. 2009 Apr 17;387(5):1067-74. Epub 2009 Feb 24. PMID:19248789<ref>PMID:19248789</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3e74" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Allantoinase]]
[[Category: Ecoli]]
[[Category: Large Structures]]
[[Category: Kim, K]]
[[Category: Hydrolase]]
[[Category: Metal-binding]]
[[Category: Purine metabolism]]
[[Category: Small beta-sheet domain]]
[[Category: Zinc]]