3doh

<StructureSection load='3doh' size='340' side='right' caption='[[3doh]], [[Resolution|resolution]] 2.60&Aring;' scene=''>

<table><tr><td colspan='2'>[[3doh]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_43589 Atcc 43589]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3DOH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3DOH FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3doi|3doi]]</td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TM_0033 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=2336 ATCC 43589])</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Carboxylesterase Carboxylesterase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.1.1 3.1.1.1] </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=3doh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3doh OCA], [http://pdbe.org/3doh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=3doh RCSB], [http://www.ebi.ac.uk/pdbsum/3doh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=3doh ProSAT]</span></td></tr>

<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/do/3doh_consurf.spt"</scriptWhenChecked>

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== Publication Abstract from PubMed ==

Comparative analysis of the genome of the hyperthermophilic bacterium Thermotoga maritima revealed a hypothetical protein (EstA) with typical esterase features. The EstA protein was functionally produced in Escherichia coli and purified to homogeneity. It indeed displayed esterase activity with optima at or above 95 degrees C and at pH 8.5, with a preference for esters with short acyl chains (C2-C10). Its 2.6-A-resolution crystal structure revealed a classical alpha/beta hydrolase domain with a catalytic triad consisting of a serine, an aspartate, and a histidine. EstA is irreversibly inhibited by the organophosphate paraoxon. A 3.0-A-resolution structure confirmed that this inhibitor binds covalently to the catalytic serine residue of EstA. Remarkably, the structure also revealed the presence of an N-terminal immunoglobulin (Ig)-like domain, which is unprecedented among esterases. EstA forms a hexamer both in the crystal and in solution. Electron microscopy showed that the hexamer in solution is identical with the hexamer in the crystal, which is formed by two trimers, with the N-terminal domains facing each other. Mutational studies confirmed that residues Phe89, Phe112, Phe116, Phe246, and Trp377 affect enzyme activity. A truncated mutant of EstA, in which the Ig-like domain was removed, showed only 5% of wild-type activity, had lower thermostability, and failed to form hexamers. These data suggest that the Ig-like domain plays an important role in the enzyme multimerization and activity of EstA.

Crystal structure and biochemical properties of a novel thermostable esterase containing an immunoglobulin-like domain.,Levisson M, Sun L, Hendriks S, Swinkels P, Akveld T, Bultema JB, Barendregt A, van den Heuvel RH, Dijkstra BW, van der Oost J, Kengen SW J Mol Biol. 2009 Jan 23;385(3):949-62. Epub 2008 Nov 5. PMID:19013466<ref>PMID:19013466</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 3doh" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Atcc 43589]]

[[Category: Carboxylesterase]]

[[Category: Dijkstra, B W]]

[[Category: Hendriks, S]]

[[Category: Kengen, S W.M]]

[[Category: Levisson, M]]

[[Category: Oost, J Van der]]

[[Category: Sun, L]]

[[Category: Alpha-beta hydrolase]]

[[Category: Hydrolase]]