View source for 4nix


==Crystal structure of trypsiligase (K60E/N143H/Y151H/D189K trypsin) orthorhombic form, zinc-bound==
<StructureSection load='4nix' size='340' side='right'caption='[[4nix]], [[Resolution|resolution]] 1.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4nix]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NIX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4NIX 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>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4niv|4niv]], [[4niw|4niw]], [[4niy|4niy]]</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Trypsin Trypsin], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.21.4 3.4.21.4] </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=4nix FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4nix OCA], [http://pdbe.org/4nix PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4nix RCSB], [http://www.ebi.ac.uk/pdbsum/4nix PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4nix ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Although site-specific incorporation of artificial functionalities into proteins is an important tool in both basic and applied research, it can be a major challenge to protein chemists. Enzymatic protein modification is an attractive goal due to the inherent regio- and stereoselectivity of enzymes, yet their specificity remains a problem. As a result of the intrinsic reversibility of enzymatic reactions, proteinases can in principle catalyze ligation reactions. While this makes them attractive tools for site-specific protein bioconjugation, competing hydrolysis reactions limits their general use. Here we describe the design and application of a highly specific trypsin variant for the selective modification of N-terminal residues of diverse proteins with various reagents. The modification proceeds quantitatively under native (aqueous) conditions. We show that the variant has a disordered zymogen-like activation domain, effectively suppressing the hydrolysis reaction, which is converted to an active conformation in the presence of appropriate substrates.

N-Terminal Protein Modification by Substrate-Activated Reverse Proteolysis.,Liebscher S, Schopfel M, Aumuller T, Sharkhuukhen A, Pech A, Hoss E, Parthier C, Jahreis G, Stubbs MT, Bordusa F Angew Chem Int Ed Engl. 2014 Feb 12. doi: 10.1002/anie.201307736. PMID:24520050<ref>PMID:24520050</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4nix" style="background-color:#fffaf0;"></div>

==See Also==
*[[Trypsin|Trypsin]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bovin]]
[[Category: Large Structures]]
[[Category: Trypsin]]
[[Category: Parthier, C]]
[[Category: Schoepfel, M]]
[[Category: Stubbs, M T]]
[[Category: Activation domain]]
[[Category: Enzyme design]]
[[Category: Hydrolase]]
[[Category: Peptide ligation]]
[[Category: Reverse proteolysis]]
[[Category: Serine proteinase]]
[[Category: Zymogen]]