View source for 4cnx


==Surface residue engineering of bovine carbonic anhydrase to an extreme halophilic enzyme for potential application in postcombustion CO2 capture==
<StructureSection load='4cnx' size='340' side='right'caption='[[4cnx]], [[Resolution|resolution]] 1.23&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4cnx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CNX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CNX 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]] 1.23&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=4cnx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4cnx OCA], [https://pdbe.org/4cnx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4cnx RCSB], [https://www.ebi.ac.uk/pdbsum/4cnx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4cnx ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CAH2_BOVIN CAH2_BOVIN] Essential for bone resorption and osteoclast differentiation (By similarity). Reversible hydration of carbon dioxide.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Enzymes expressed by highly salt-tolerant organisms show many modifications compared with salt-affected counterparts including biased amino acid and lower alpha-helix content, lower solvent accessibility and negative surface charge. Here, we show that halotolerance can be generated in an enzyme solely by modifying surface residues. Rational design of carbonic anhydrase II is undertaken in three stages replacing 18 residues in total, crystal structures confirm changes are confined to surface residues. Catalytic activities and thermal unfolding temperatures of the designed enzymes increase at high salt concentrations demonstrating their shift to halotolerance, whereas the opposite response is found in the wild-type enzyme. Molecular dynamics calculations reveal a key role for sodium ions in increasing halotolerant enzyme stability largely through interactions with the highly ordered first Na(+) hydration shell. For the first time, an approach to generate extreme halotolerance, a trait with broad application in industrial biocatalysis, in a wild-type enzyme is demonstrated.

Rational engineering of a mesohalophilic carbonic anhydrase to an extreme halotolerant biocatalyst.,Warden AC, Williams M, Peat TS, Seabrook SA, Newman J, Dojchinov G, Haritos VS Nat Commun. 2015 Dec 21;6:10278. doi: 10.1038/ncomms10278. PMID:26687908<ref>PMID:26687908</ref>

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

==See Also==
*[[Carbonic anhydrase 3D structures|Carbonic anhydrase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Bos taurus]]
[[Category: Large Structures]]
[[Category: Dojchinov G]]
[[Category: Haritos V]]
[[Category: Newman J]]
[[Category: Peat TS]]
[[Category: Seabrook S]]
[[Category: Warden A]]
[[Category: Williams M]]