1qix

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[[Image:1qix.png|left|200px]]
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==PORCINE PANCREATIC ELASTASE COMPLEXED WITH HUMAN BETA-CASOMORPHIN-7==
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<StructureSection load='1qix' size='340' side='right' caption='[[1qix]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1qix]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QIX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1QIX FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene><br>
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<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3est|3est]]</td></tr>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Hydrolase Hydrolase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.36 and 3.4.21.37 3.4.21.36 and 3.4.21.37] </span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qix FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qix OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1qix RCSB], [http://www.ebi.ac.uk/pdbsum/1qix PDBsum]</span></td></tr>
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<table>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qi/1qix_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Mass spectrometric screening reveals that an unmodified natural heptapeptide--human beta-casomorphin-7, an internal sequence of human beta-casein that possesses opioid-like activity--reacts with porcine pancreatic elastase to form an unusually stable acyl-enzyme complex at low pH. X-ray crystallographic analysis (to 1.9 A resolution) at pH 5 shows continuous electron density linking the C-terminal isoleucine of beta-casomorphin-7 to Ser 195 through an ester bond. The structure reveals a well defined water molecule (Wat 317), equidistant between the carbon of the ester carbonyl and N epsilon 2 of His 57. Deprotonation of Wat 317 will produce a hydroxide ion positioned to attack the ester carbonyl through the favoured Burgi-Dunitz trajectory.
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{{STRUCTURE_1qix| PDB=1qix | SCENE= }}
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Structure of a specific acyl-enzyme complex formed between beta-casomorphin-7 and porcine pancreatic elastase.,Wilmouth RC, Clifton IJ, Robinson CV, Roach PL, Aplin RT, Westwood NJ, Hajdu J, Schofield CJ Nat Struct Biol. 1997 Jun;4(6):456-62. PMID:9187653<ref>PMID:9187653</ref>
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===PORCINE PANCREATIC ELASTASE COMPLEXED WITH HUMAN BETA-CASOMORPHIN-7===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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{{ABSTRACT_PUBMED_9187653}}
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==About this Structure==
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[[1qix]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QIX OCA].
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==See Also==
==See Also==
*[[Elastase|Elastase]]
*[[Elastase|Elastase]]
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== References ==
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==Reference==
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<references/>
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<ref group="xtra">PMID:009187653</ref><references group="xtra"/>
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__TOC__
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</StructureSection>
[[Category: Hydrolase]]
[[Category: Hydrolase]]
[[Category: Sus scrofa]]
[[Category: Sus scrofa]]

Revision as of 22:16, 28 September 2014

PORCINE PANCREATIC ELASTASE COMPLEXED WITH HUMAN BETA-CASOMORPHIN-7

1qix, resolution 1.90Å

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