View source for 3prk


==INHIBITION OF PROTEINASE K BY METHOXYSUCCINYL-ALA-ALA-PRO-ALA-CHLOROMETHYL KETONE. AN X-RAY STUDY AT 2.2-ANGSTROMS RESOLUTION==
<StructureSection load='3prk' size='340' side='right' caption='[[3prk]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3prk]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Beauveria_alba Beauveria alba]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PRK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3PRK FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
<tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=0QE:CHLOROMETHANE'>0QE</scene>, <scene name='pdbligand=ALV:(2S)-2-AMINOPROPANE-1,1-DIOL'>ALV</scene>, <scene name='pdbligand=MSU:SUCCINIC+ACID+MONOMETHYL+ESTER'>MSU</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">PROK ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=37998 Beauveria alba])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Peptidase_K Peptidase K], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.64 3.4.21.64] </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=3prk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3prk OCA], [http://pdbe.org/3prk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3prk RCSB], [http://www.ebi.ac.uk/pdbsum/3prk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3prk ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/PRTK_TRIAL PRTK_TRIAL]] 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/pr/3prk_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=3prk ConSurf].
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== Publication Abstract from PubMed ==
The crystal structure of the transition state analog complex formed covalently between proteinase K and methoxysuccinyl-Ala-Ala-Pro-Ala-chloromethyl ketone was determined by x-ray diffraction methods at a resolution of 2.2 A and refined by constrained least squares to an R factor of 19.8% for the 11864 structure amplitudes greater than 1 sigma F. The chloromethyl ketone group is covalently linked with the active site functional groups His69(N epsilon) and Ser224(O gamma). The former has substituted for chlorine and the latter has attacked the carbon of the ketone group, thereby forming the tetrahedral carbon atom of the transition state analog. The peptide part of the inhibitor is in an extended conformation and fills subsites S1 to S5 of the substrate recognition site. Its backbone hydrogens bond with strands 100-104 and 132-136 of the substrate recognition site as the central strand of a three-stranded antiparallel beta-pleated sheet. This sheet formation is associated with a movement by approximately 1 A of strand 100-104 which is probably associated with the insertion of the bulky proline side chain. The methoxysuccinyl group is stacked on the phenolic side chain of Tyr104 that is a part of the bottom of the recognition site. Biochemical studies show that shorter inhibitors of this type are less effective than the longer one, because there are fewer hydrogen bonding and van der Waals/stacking interactions.

Inhibition of proteinase K by methoxysuccinyl-Ala-Ala-Pro-Ala-chloromethyl ketone. An x-ray study at 2.2-A resolution.,Wolf WM, Bajorath J, Muller A, Raghunathan S, Singh TP, Hinrichs W, Saenger W J Biol Chem. 1991 Sep 15;266(26):17695-9. PMID:1894649<ref>PMID:1894649</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 3prk" style="background-color:#fffaf0;"></div>

==See Also==
*[[Proteinase|Proteinase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Beauveria alba]]
[[Category: Peptidase K]]
[[Category: Bajorath, J]]
[[Category: Hinrichs, W]]
[[Category: Mueller, A]]
[[Category: Raghunathan, S]]
[[Category: Saenger, W]]
[[Category: Singh, T P]]
[[Category: Wolf, W M]]
[[Category: Hydrolase-hydrolase inhibitor complex]]
[[Category: Serine proteinase]]