View source for 1pfg


==Strategy to design inhibitors: Structure of a complex of Proteinase K with a designed octapeptide inhibitor N-Ac-Pro-Ala-Pro-Phe-DAla-Ala-Ala-Ala-NH2 at 2.5A resolution==
<StructureSection load='1pfg' size='340' side='right'caption='[[1pfg]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1pfg]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Parengyodontium_album Parengyodontium album]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1PFG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1PFG 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=NH2:AMINO+GROUP'>NH2</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=1pfg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1pfg OCA], [https://pdbe.org/1pfg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1pfg RCSB], [https://www.ebi.ac.uk/pdbsum/1pfg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1pfg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/PRTK_PARAQ PRTK_PARAQ] Hydrolyzes keratin at aromatic and hydrophobic residues.
== 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/pf/1pfg_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1pfg ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The crystal structure of a complex formed by the interaction between proteinase K and a designed octapeptide amide, N-Ac-Pro-Ala-Pro-Phe-DAla-Ala-Ala-Ala-NH2, has been determined at 2.5 A resolution and refined to an R-factor of 16.7% for 7,430 reflections in the resolution range of 8.0-2.50 A. The inhibitor forms a stable complex through a series of hydrogen bonds and hydrophobic interactions with the protein atoms and water molecules. The inhibitor is hydrolyzed between Phe4I and DAla5I (I indicates the inhibitor). The two fragments are separated by a distance of 3.2 A between the carbonyl carbon of Phe4I and the main-chain nitrogen of DAla5I. The N-terminal tetrapeptide occupies subsites S1-S5 (S5 for acetyl group), whereas the C-terminal part fits into S1'-S5' region (S5' for amide group). It is the first time that such an extended electron density for a designed synthetic peptide inhibitor has been observed in the prime region of an enzyme of the subtilisin family. In fact, the inhibitor fills the recognition site completely. There is only a slight rearrangement of the protein residues to accommodate the inhibitor. Superposition of the present octapeptide inhibitor on the hexapeptide inhibitor studied previously shows an overall homology of the two inhibitors, although the individual atoms are displaced significantly. It suggests the existence of a recognition site with flexible dimensions. Kinetic studies indicate an inhibition rate of 100% by this specifically designed peptide inhibitor.

Strategy to design peptide inhibitors: structure of a complex of proteinase K with a designed octapeptide inhibitor N-Ac-Pro-Ala-Pro-Phe-DAla-Ala-Ala-Ala-NH2 at 2.5 A resolution.,Saxena AK, Singh TP, Peters K, Fittkau S, Betzel C Protein Sci. 1996 Dec;5(12):2453-8. PMID:8976553<ref>PMID:8976553</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 1pfg" style="background-color:#fffaf0;"></div>

==See Also==
*[[Proteinase 3D structures|Proteinase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Parengyodontium album]]
[[Category: Betzel C]]
[[Category: Fittkau S]]
[[Category: Peters K]]
[[Category: Saxena AK]]
[[Category: Singh TP]]