View source for 2b6n


==The 1.8 A crystal structure of a Proteinase K like enzyme from a psychrotroph Serratia species==
<StructureSection load='2b6n' size='340' side='right'caption='[[2b6n]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2b6n]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Serratia_sp._GF96 Serratia sp. GF96]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2B6N OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2B6N 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]] 1.8&#8491;</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=2b6n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2b6n OCA], [https://pdbe.org/2b6n PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2b6n RCSB], [https://www.ebi.ac.uk/pdbsum/2b6n PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2b6n ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q3HUQ2_9GAMM Q3HUQ2_9GAMM] 
== 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/b6/2b6n_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=2b6n ConSurf].
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== Publication Abstract from PubMed ==
Proteins from organisms living in extreme conditions are of particular interest because of their potential for being templates for redesign of enzymes both in biotechnological and other industries. The crystal structure of a proteinase K-like enzyme from a psychrotroph Serratia species has been solved to 1.8 A. The structure has been compared with the structures of proteinase K from Tritirachium album Limber and Vibrio sp. PA44 in order to reveal structural explanations for differences in biophysical properties. The Serratia peptidase shares around 40 and 64% identity with the Tritirachium and Vibrio peptidases, respectively. The fold of the three enzymes is essentially identical, with minor exceptions in surface loops. One calcium binding site is found in the Serratia peptidase, in contrast to the Tritirachium and Vibrio peptidases which have two and three, respectively. A disulfide bridge close to the S2 site in the Serratia and Vibrio peptidases, an extensive hydrogen bond network in a tight loop close to the substrate binding site in the Serratia peptidase and different amino acid sequences in the S4 sites are expected to cause different substrate specificity in the three enzymes. The more negative surface potential of the Serratia peptidase, along with a disulfide bridge close to the S2 binding site of a substrate, is also expected to contribute to the overall lower binding affinity observed for the Serratia peptidase. Clear electron density for a tripeptide, probably a proteolysis product, was found in the S' sites of the substrate binding cleft.

The 1.8 A crystal structure of a proteinase K-like enzyme from a psychrotroph Serratia species.,Helland R, Larsen AN, Smalas AO, Willassen NP FEBS J. 2006 Jan;273(1):61-71. PMID:16367748<ref>PMID:16367748</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 2b6n" style="background-color:#fffaf0;"></div>

==See Also==
*[[Proteinase 3D structures|Proteinase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Serratia sp. GF96]]
[[Category: Helland R]]
[[Category: Larsen AN]]
[[Category: Smalas AO]]
[[Category: Willassen NP]]