View source for 4ixw


==Halohydrin dehalogenase (HheC) bound to ethyl (2S)-oxiran-2-ylacetate==
<StructureSection load='4ixw' size='340' side='right' caption='[[4ixw]], [[Resolution|resolution]] 2.47&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4ixw]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"achromobacter_radiobacter"_(beijerinck_and_van_delden_1902)_bergey_et_al._1934 "achromobacter radiobacter" (beijerinck and van delden 1902) bergey et al. 1934]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IXW OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4IXW FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=IXW:ETHYL+(2S)-OXIRAN-2-YLACETATE'>IXW</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4ixt|4ixt]], [[4iy1|4iy1]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">hheC ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=358 "Achromobacter radiobacter" (Beijerinck and van Delden 1902) Bergey et al. 1934])</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=4ixw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ixw OCA], [http://pdbe.org/4ixw PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4ixw RCSB], [http://www.ebi.ac.uk/pdbsum/4ixw PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4ixw ProSAT]</span></td></tr>
</table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Two highly engineered halohydrin dehalogenase variants were characterized in terms of their performance in dehalogenation and epoxide cyanolysis reactions. Both enzyme variants outperformed the wild-type enzyme in the cyanolysis of ethyl (S)-3,4-epoxybutyrate, a conversion yielding ethyl (R)-4-cyano-3-hydroxybutyrate, an important chiral building block for statin synthesis. One of the enzyme variants, HheC2360, displayed catalytic rates for this cyanolysis reaction enhanced up to tenfold. Furthermore, the enantioselectivity of this variant was the opposite of that of the wild-type enzyme, both for dehalogenation and for cyanolysis reactions. The 37-fold mutant HheC2360 showed an increase in thermal stability of 8 degrees C relative to the wild-type enzyme. Crystal structures of this enzyme were elucidated with chloride and ethyl (S)-3,4-epoxybutyrate or with ethyl (R)-4-cyano-3-hydroxybutyrate bound in the active site. The observed increase in temperature stability was explained in terms of a substantial increase in buried surface area relative to the wild-type HheC, together with enhanced interfacial interactions between the subunits that form the tetramer. The structures also revealed that the substrate binding pocket was modified both by substitutions and by backbone movements in loops surrounding the active site. The observed changes in the mutant structures are partly governed by coupled mutations, some of which are necessary to remove steric clashes or to allow backbone movements to occur. The importance of interactions between substitutions suggests that efficient directed evolution strategies should allow for compensating and synergistic mutations during library design.

Biocatalytic and structural properties of a highly engineered halohydrin dehalogenase.,Schallmey M, Floor RJ, Hauer B, Breuer M, Jekel PA, Wijma HJ, Dijkstra BW, Janssen DB Chembiochem. 2013 May 10;14(7):870-81. doi: 10.1002/cbic.201300005. Epub 2013 Apr, 12. PMID:23585096<ref>PMID:23585096</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4ixw" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Breuer, M]]
[[Category: Dijkstra, B W]]
[[Category: Floor, R J]]
[[Category: Hauer, B]]
[[Category: Janssen, D B]]
[[Category: Jekel, P A]]
[[Category: Schallmey, M]]
[[Category: Wijma, H J]]
[[Category: Atorvastatin synthesis]]
[[Category: Backbone change]]
[[Category: Coupled mutation]]
[[Category: Cyanolysis]]
[[Category: Dehalogenase]]
[[Category: Directed evolution]]
[[Category: Enantioselectivity change]]
[[Category: Lyase]]
[[Category: Proline-induced]]
[[Category: Protein engineering]]
[[Category: Short-chain dehydrogenase/reductase enzyme superfamily]]
[[Category: Synergistic mutation]]
[[Category: Thermostability]]