View source for 1gkr


==L-Hydantoinase (Dihydropyrimidinase) from Arthrobacter aurescens==
<StructureSection load='1gkr' size='340' side='right'caption='[[1gkr]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1gkr]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Paenarthrobacter_aurescens Paenarthrobacter aurescens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1GKR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1GKR 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]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=1gkr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1gkr OCA], [https://pdbe.org/1gkr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1gkr RCSB], [https://www.ebi.ac.uk/pdbsum/1gkr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1gkr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/HYDL_PAEAU HYDL_PAEAU] Rather more predominant for the cleavage of aryl- than for alkyl-hydantoin derivatives. The stereoselectivity of this enzyme depends on the substrate used for bioconversion: strictly L-selective for the cleavage of D,L-5-indolylmethylhydantoin, but D-selective for the hydrolysis of D,L-methylthioethylhydantoin.
== 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/gk/1gkr_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=1gkr ConSurf].
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== Publication Abstract from PubMed ==
L-Hydantoinase from Arthrobacter aurescens (L-Hyd) is a member of the dihydropyrimidinases which in turn belong to the cyclic amidases. Dihydropyrimidinases catalyze the reversible hydrolytic ring opening of dihydropyrimidines as the second step in the catabolism of pyrimidines. In biotechnology, their hydroloytic activity on five-membered cyclic diamides (hydantoins) is used in the enantio-specific production of amino acids from racemic hydantoins. L-Hyd differs from most of the other dihydropyrimidinases by an L-enantio specificity and by lacking activity on possible natural substrates such as dihydropyrimidines. In this paper, we describe the three-dimensional structure of L-Hyd which was solved by molecular replacement using a homology model and subsequently refined to 2.6 A resolution. Each subunit of the tetrameric L-Hyd consists of an elliptically distorted (alpha/beta)(8)-barrel domain, which hosts the active site, and a beta-sheet domain. In the active site, a binuclear zinc center activates a water molecule for nucleophilic attack on the substrates' amide bond. L-Hyd shows a strong homology both in fold and in metal coordination in the active site to another dihydropyrimidinase from Thermus sp. (D-hydantoinase) and to a slightly lesser degree to ureases, dihydroorotase and phosphotriesterase. Using the homology to ureases, a model for the transition state was modeled in the active site of L-Hyd and D-hydantoinase. This model could provide an explanation for the different substrate and enantio selectivities of both dihydropyrimidinases.

The structure of L-hydantoinase from Arthobacter aurescens leads to an understanding of dihydropyrimidinase substrate and enantio specificity.,Abendroth J, Niefind K, May O, Siemann M, Syldatk C, Schomburg D Biochemistry. 2002 Jul 9;41(27):8589-97. PMID:12093275<ref>PMID:12093275</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Paenarthrobacter aurescens]]
[[Category: Abendroth J]]
[[Category: Niefind K]]
[[Category: Schomburg D]]