4coq: Difference between revisions
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==The complex of alpha-Carbonic anhydrase from Thermovibrio ammonificans with inhibitor sulfanilamide.== | ==The complex of alpha-Carbonic anhydrase from Thermovibrio ammonificans with inhibitor sulfanilamide.== | ||
<StructureSection load='4coq' size='340' side='right' caption='[[4coq]], [[Resolution|resolution]] 1.55Å' scene=''> | <StructureSection load='4coq' size='340' side='right' caption='[[4coq]], [[Resolution|resolution]] 1.55Å' scene=''> | ||
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</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=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene>, <scene name='pdbligand=PG6:1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE'>PG6</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene>, <scene name='pdbligand=SAN:SULFANILAMIDE'>SAN</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | </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=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene>, <scene name='pdbligand=PG6:1-(2-METHOXY-ETHOXY)-2-{2-[2-(2-METHOXY-ETHOXY]-ETHOXY}-ETHANE'>PG6</scene>, <scene name='pdbligand=PGE:TRIETHYLENE+GLYCOL'>PGE</scene>, <scene name='pdbligand=SAN:SULFANILAMIDE'>SAN</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr> | ||
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carbonate_dehydratase Carbonate dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.1 4.2.1.1] </span></td></tr> | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carbonate_dehydratase Carbonate dehydratase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.1 4.2.1.1] </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=4coq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4coq OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4coq RCSB], [http://www.ebi.ac.uk/pdbsum/4coq PDBsum]</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=4coq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4coq OCA], [http://pdbe.org/4coq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4coq RCSB], [http://www.ebi.ac.uk/pdbsum/4coq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4coq ProSAT]</span></td></tr> | ||
</table> | </table> | ||
<div style="background-color:#fffaf0;"> | <div style="background-color:#fffaf0;"> | ||
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | ||
</div> | </div> | ||
<div class="pdbe-citations 4coq" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Carbonic anhydrase|Carbonic anhydrase]] | |||
== References == | == References == | ||
<references/> | <references/> | ||
Revision as of 11:02, 11 August 2016
The complex of alpha-Carbonic anhydrase from Thermovibrio ammonificans with inhibitor sulfanilamide.The complex of alpha-Carbonic anhydrase from Thermovibrio ammonificans with inhibitor sulfanilamide.
Structural highlights
Publication Abstract from PubMedCarbonic anhydrase enzymes catalyse the reversible hydration of carbon dioxide to bicarbonate. A thermophilic Thermovibrio ammonificans alpha-carbonic anhydrase (TaCA) has been expressed in Escherichia coli and structurally and biochemically characterized. The crystal structure of TaCA has been determined in its native form and in two complexes with bound inhibitors. The tetrameric enzyme is stabilized by a unique core in the centre of the molecule formed by two intersubunit disulfides and a single lysine residue from each monomer that is involved in intersubunit ionic interactions. The structure of this core protects the intersubunit disulfides from reduction, whereas the conserved intrasubunit disulfides are not formed in the reducing environment of the E. coli host cytosol. When oxidized to mimic the environment of the periplasmic space, TaCA has increased thermostability, retaining 90% activity after incubation at 70 degrees C for 1 h, making it a good candidate for industrial carbon-dioxide capture. The reduction of all TaCA cysteines resulted in dissociation of the tetrameric molecule into monomers with lower activity and reduced thermostability. Unlike other characterized alpha-carbonic anhydrases, TaCA does not display esterase activity towards p-nitrophenyl acetate, which appears to result from the increased rigidity of its protein scaffold. The structure of a tetrameric alpha-carbonic anhydrase from Thermovibrio ammonificans reveals a core formed around intermolecular disulfides that contribute to its thermostability.,James P, Isupov MN, Sayer C, Saneei V, Berg S, Lioliou M, Kotlar HK, Littlechild JA Acta Crystallogr D Biol Crystallogr. 2014 Oct 1;70(Pt 10):2607-18. doi:, 10.1107/S1399004714016526. Epub 2014 Sep 27. PMID:25286845[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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