View source for 1uoq


==PROLYL OLIGOPEPTIDASE FROM PORCINE BRAIN, S554A MUTANT WITH BOUND PEPTIDE LIGAND GLU-PHE-SER-PRO==
<StructureSection load='1uoq' size='340' side='right' caption='[[1uoq]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1uoq]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Pig Pig]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1UOQ OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1UOQ FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GOL:GLYCEROL'>GOL</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1e5t|1e5t]], [[1e8m|1e8m]], [[1e8n|1e8n]], [[1h2w|1h2w]], [[1h2x|1h2x]], [[1h2y|1h2y]], [[1h2z|1h2z]], [[1o6f|1o6f]], [[1o6g|1o6g]], [[1qfm|1qfm]], [[1qfs|1qfs]], [[1uoo|1uoo]], [[1uop|1uop]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Prolyl_oligopeptidase Prolyl oligopeptidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.26 3.4.21.26] </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=1uoq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1uoq OCA], [http://pdbe.org/1uoq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1uoq RCSB], [http://www.ebi.ac.uk/pdbsum/1uoq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1uoq ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/PPCE_PIG PPCE_PIG]] Cleaves peptide bonds on the C-terminal side of prolyl residues within peptides that are up to approximately 30 amino acids long. 
== 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/uo/1uoq_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=1uoq ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The positive electrostatic environment of the active site of prolyl oligopeptidase was investigated by using substrates with glutamic acid at positions P2, P3, P4, and P5, respectively. The different substrates gave various pH rate profiles. The pKa values extracted from the curves are apparent parameters, presumably affected by the nearby charged residues, and do not reflect the ionization of a simple catalytic histidine as found in the classic serine peptidases like chymotrypsin and subtilisin. The temperature dependence of kcat/Km did not produce linear Arrhenius plots, indicating different changes in the individual rate constants with the increase in temperature. This rendered it possible to calculate these constants, i.e. the formation (k1) and decomposition (k-1) of the enzyme-substrate complex and the acylation constant (k2), as well as the corresponding activation energies. The results have revealed the relationship between the complex Michaelis parameters and the individual rate constants. Structure determination of the enzyme-substrate complexes has shown that the different substrates display a uniform binding mode. None of the glutamic acids interacts with a charged group. We conclude that the specific rate constant is controlled by k1 rather than k2 and that the charged residues from the substrate and the enzyme can markedly affect the formation but not the structure of the enzyme-substrate complexes.

Electrostatic environment at the active site of prolyl oligopeptidase is highly influential during substrate binding.,Szeltner Z, Rea D, Renner V, Juliano L, Fulop V, Polgar L J Biol Chem. 2003 Dec 5;278(49):48786-93. Epub 2003 Sep 25. PMID:14514675<ref>PMID:14514675</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1uoq" style="background-color:#fffaf0;"></div>

==See Also==
*[[Prolyl Endopeptidase|Prolyl Endopeptidase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Pig]]
[[Category: Prolyl oligopeptidase]]
[[Category: Fulop, V]]
[[Category: Rea, D]]
[[Category: Alpha/ beta-hydrolase]]
[[Category: Amnesia]]
[[Category: Beta-propeller]]
[[Category: Hydrolase]]
[[Category: Serine protease]]