View source for 1jsr


==CRYSTAL STRUCTURE OF ERWINIA CHRYSANTHEMI L-ASPARAGINASE COMPLEXED WITH 6-HYDROXY-L-NORLEUCINE==
<StructureSection load='1jsr' size='340' side='right'caption='[[1jsr]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1jsr]] is a 4 chain structure with sequence from [http://en.wikipedia.org/wiki/"erwinia_carotovora_var._chrysanthemi"_(burkholder_et_al._1953)_dye_1969 "erwinia carotovora var. chrysanthemi" (burkholder et al. 1953) dye 1969]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1JSR OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1JSR FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=1PE:PENTAETHYLENE+GLYCOL'>1PE</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=LDO:6-HYDROXY-L-NORLEUCINE'>LDO</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1jsl|1jsl]], [[1hfw|1hfw]], [[1hg1|1hg1]], [[1hg0|1hg0]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Asparaginase Asparaginase], with EC number [http://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'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1jsr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1jsr OCA], [http://pdbe.org/1jsr PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1jsr RCSB], [http://www.ebi.ac.uk/pdbsum/1jsr PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1jsr ProSAT]</span></td></tr>
</table>
== 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/js/1jsr_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=1jsr ConSurf].
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== Publication Abstract from PubMed ==
The structures of Erwinia chrysanthemi L-asparaginase (ErA) complexed with the L- and D-stereoisomers of the suicide inhibitor, 6-diazo-5-oxy-norleucine, have been solved using X-ray crystallography and refined with data extending to 1.7 A. The distances between the Calpha atoms of the inhibitor molecules and the hydroxyl oxygen atoms of Thr-15 and Tyr-29 (1.20 and 1.60 A, respectively) clearly indicate the presence of covalent bonds between these moieties, confirming the nucleophilic role of Thr-15 during the first stage of enzymatic reactions and also indicating direct involvement of Tyr-29. The factors responsible for activating Tyr-29 remain unclear, although some structural changes around Ser-254', Asp-96, and Glu-63, common to both complexes, suggest that those residues play a function. The role of Glu-289' as the activator of Tyr-29, previously postulated for the closely related Pseudomonas 7A L-glutaminase-asparaginase, is not confirmed in this study, due to the lack of interactions between these residues in these complexes and in holoenzymes. The results reported here are consistent with previous reports that mutants of Escherichia coli L-asparaginase lacking Glu-289 remain catalytically active and prove the catalytic roles of both Thr-15 and Tyr-29, while still leaving open the question of the exact mechanism resulting in the unusual chemical properties of these residues.

Do bacterial L-asparaginases utilize a catalytic triad Thr-Tyr-Glu?,Aghaiypour K, Wlodawer A, Lubkowski J Biochim Biophys Acta. 2001 Dec 17;1550(2):117-28. PMID:11755201<ref>PMID:11755201</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 1jsr" style="background-color:#fffaf0;"></div>

==See Also==
*[[Asparaginase 3D structures|Asparaginase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Asparaginase]]
[[Category: Large Structures]]
[[Category: Aghaiypour, K]]
[[Category: Lubkowski, J]]
[[Category: Wlodawer, A]]
[[Category: 6-diazo-5-oxo-l-norleucine]]
[[Category: Covalent complex]]
[[Category: Hydrolase]]