1hb0: Difference between revisions
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== | ==Snapshots of serine protease catalysis: (D) acyl-enzyme intermediate between porcine pancreatic elastase and human beta-casomorphin-7 jumped to pH 10 for 2 minutes== | ||
Studies on the catalytic mechanism and inhibition of serine proteases are | <StructureSection load='1hb0' size='340' side='right'caption='[[1hb0]], [[Resolution|resolution]] 2.05Å' scene=''> | ||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1hb0]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HB0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HB0 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]] 2.05Å</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=SO4:SULFATE+ION'>SO4</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=1hb0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hb0 OCA], [https://pdbe.org/1hb0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hb0 RCSB], [https://www.ebi.ac.uk/pdbsum/1hb0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hb0 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/CELA1_PIG CELA1_PIG] Acts upon elastin. | |||
== 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/hb/1hb0_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=1hb0 ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Studies on the catalytic mechanism and inhibition of serine proteases are widely used as paradigms for teaching enzyme catalysis. Ground-breaking work on the structures of chymotrypsin and subtilisin led to the idea of a conserved catalytic triad formed by the active site Ser, His and Asp residues. An oxyanion hole, consisting of the peptide amide of the active site serine and a neighbouring glycine, was identified, and hydrogen bonding in the oxyanion hole was suggested to stabilize the two proposed tetrahedral intermediates on the catalytic pathway. Here we show electron density changes consistent with the formation of a tetrahedral intermediate during the hydrolysis of an acyl-enzyme complex formed between a natural heptapeptide and elastase. No electron density for an enzyme-product complex was observed. The structures also suggest a mechanism for the synchronization of hydrolysis and peptide release triggered by the conversion of the sp2 hybridized carbonyl carbon to an sp3 carbon in the tetrahedral intermediate. This affects the location of the peptide in the active site cleft, triggering the collapse of a hydrogen bonding network between the peptide and the beta-sheet of the active site. | |||
X-ray snapshots of serine protease catalysis reveal a tetrahedral intermediate.,Wilmouth RC, Edman K, Neutze R, Wright PA, Clifton IJ, Schneider TR, Schofield CJ, Hajdu J Nat Struct Biol. 2001 Aug;8(8):689-94. PMID:11473259<ref>PMID:11473259</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
[[Category: | <div class="pdbe-citations 1hb0" style="background-color:#fffaf0;"></div> | ||
==See Also== | |||
*[[Elastase 3D structures|Elastase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Sus scrofa]] | [[Category: Sus scrofa]] | ||
[[Category: Clifton IJ]] | |||
[[Category: Clifton | [[Category: Edman K]] | ||
[[Category: Edman | [[Category: Hajdu J]] | ||
[[Category: Hajdu | [[Category: Neutze R]] | ||
[[Category: Neutze | [[Category: Schneider TR]] | ||
[[Category: Schneider | [[Category: Schofield CJ]] | ||
[[Category: Schofield | [[Category: Wilmouth RC]] | ||
[[Category: Wilmouth | [[Category: Wright PA]] | ||
[[Category: Wright | |||