View source for 1jn9


==Structure of Putative Asparaginase Encoded by Escherichia coli ybiK Gene==
<StructureSection load='1jn9' size='340' side='right'caption='[[1jn9]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1jn9]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JN9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1JN9 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=CME:S,S-(2-HYDROXYETHYL)THIOCYSTEINE'>CME</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;'>[[1apy|1apy]], [[1apz|1apz]], [[1ayy|1ayy]], [[2gac|2gac]], [[2gaw|2gaw]], [[9gaa|9gaa]], [[9gac|9gac]], [[9gaf|9gaf]]</div></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Asparaginase Asparaginase], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.1.1 3.5.1.1] </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=1jn9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jn9 OCA], [https://pdbe.org/1jn9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1jn9 RCSB], [https://www.ebi.ac.uk/pdbsum/1jn9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1jn9 ProSAT]</span></td></tr>
</table>
== Function ==
[[https://www.uniprot.org/uniprot/IAAA_ECOLI IAAA_ECOLI]] Degrades proteins damaged by L-isoaspartyl residue formation (also known as beta-Asp residues). Degrades L-isoaspartyl-containing di- and maybe also tripeptides. Also has L-asparaginase activity, although this may not be its principal function.<ref>PMID:11988085</ref>   May be involved in glutathione, and possibly other peptide, transport, although these results could also be due to polar effects of disruption.<ref>PMID:11988085</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/jn/1jn9_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=1jn9 ConSurf].
<div style="clear:both"></div>
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== Publication Abstract from PubMed ==
Plant-type L-asparaginases hydrolyze the side-chain amide bond of L-asparagine or its beta-peptides. They belong to the N-terminal nucleophile (Ntn) hydrolases and are synthesized as inactive precursor molecules. Activation occurs via the autoproteolytic release of two subunits, alpha and beta, the latter of which carries the nucleophile at its N-terminus. Crystallographic studies of plant-type asparaginases have focused on an Escherichia coli homologue (EcAIII), which has been crystallized in several crystal forms. Although they all belong to the same P2 1 2 1 2 1 space group with similar unit-cell parameters, they display different crystal-packing arrangements and thus should be classified as separate polymorphs. This variability stems mainly from different positions of the EcAIII molecules within the unit cell, although they also exhibit slight differences in orientation. The intermolecular interactions that trigger different crystal lattice formation are mediated by ions, which represent the most variable component of the crystallization conditions. This behaviour confirms recent observations that small molecules might promote protein crystal lattice formation.

Crystal packing of plant-type L-asparaginase from Escherichia coli.,Michalska K, Borek D, Hernandez-Santoyo A, Jaskolski M Acta Crystallogr D Biol Crystallogr. 2008 Mar;64(Pt 3):309-20. Epub 2008, Feb 20. PMID:18323626<ref>PMID:18323626</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1jn9" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bacillus coli migula 1895]]
[[Category: Asparaginase]]
[[Category: Large Structures]]
[[Category: Borek, D]]
[[Category: Jaskolski, M]]
[[Category: Autoproteolysis]]
[[Category: Hydrolase]]
[[Category: Ntn hydrolase]]