View source for 6xy9


==Crystal structure of haloalkane dehalogenase DbeA-M1 loop variant from Bradyrhizobium elkanii==
<StructureSection load='6xy9' size='340' side='right'caption='[[6xy9]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6xy9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Bradyrhizobium_elkanii_USDA_94 Bradyrhizobium elkanii USDA 94]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6XY9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6XY9 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]] 2.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</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=6xy9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6xy9 OCA], [https://pdbe.org/6xy9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6xy9 RCSB], [https://www.ebi.ac.uk/pdbsum/6xy9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6xy9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/E2RV62_BRAEL E2RV62_BRAEL] Catalyzes hydrolytic cleavage of carbon-halogen bonds in halogenated aliphatic compounds, leading to the formation of the corresponding primary alcohols, halide ions and protons (By similarity).[HAMAP-Rule:MF_01231]
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== Publication Abstract from PubMed ==
Engineering enzyme catalytic properties is important for basic research as well as for biotechnological applications. We have previously shown that the reshaping of enzyme access tunnels via the deletion of a short surface loop element may yield a haloalkane dehalogenase variant with markedly modified substrate specificity and enantioselectivity. Here, we conversely probed the effects of surface loop-helix transplantation from one enzyme to another within the enzyme family of haloalkane dehalogenases. Precisely, we transplanted a nine-residue long extension of L9 loop and alpha4 helix from DbjA into the corresponding site of DbeA. Biophysical characterization showed that this fragment transplantation did not affect the overall protein fold or oligomeric state, but lowered protein stability (DeltaT m = -5 to 6 degrees C). Interestingly, the crystal structure of DbeA mutant revealed the unique structural features of enzyme access tunnels, which are known determinants of catalytic properties for this enzyme family. Biochemical data confirmed that insertion increased activity of DbeA with various halogenated substrates and altered its enantioselectivity with several linear beta-bromoalkanes. Our findings support a protein engineering strategy employing surface loop-helix transplantation for construction of novel protein catalysts with modified catalytic properties.

Structural and catalytic effects of surface loop-helix transplantation within haloalkane dehalogenase family.,Marek M, Chaloupkova R, Prudnikova T, Sato Y, Rezacova P, Nagata Y, Kuta Smatanova I, Damborsky J Comput Struct Biotechnol J. 2020 Jun 3;18:1352-1362. doi:, 10.1016/j.csbj.2020.05.019. eCollection 2020. PMID:32612758<ref>PMID:32612758</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 6xy9" style="background-color:#fffaf0;"></div>

==See Also==
*[[Dehalogenase 3D structures|Dehalogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bradyrhizobium elkanii USDA 94]]
[[Category: Large Structures]]
[[Category: Chaloupkova R]]
[[Category: Damborsky J]]
[[Category: Kuta Smatanova I]]
[[Category: Prudnikova T]]
[[Category: Rezacova P]]