2e3j: Difference between revisions
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== | ==The crystal structure of epoxide hydrolase B (Rv1938) from mycobacterium tuberculosis at 2.1 angstrom== | ||
<StructureSection load='2e3j' size='340' side='right'caption='[[2e3j]], [[Resolution|resolution]] 2.10Å' scene=''> | |||
[ | == Structural highlights == | ||
[[ | <table><tr><td colspan='2'>[[2e3j]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis_H37Rv Mycobacterium tuberculosis H37Rv]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2E3J OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2E3J 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]] 2.1Å</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></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=2e3j FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2e3j OCA], [https://pdbe.org/2e3j PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2e3j RCSB], [https://www.ebi.ac.uk/pdbsum/2e3j PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2e3j ProSAT], [https://www.topsan.org/Proteins/TBSGC/2e3j TOPSAN]</span></td></tr> | ||
[[ | </table> | ||
[ | == Function == | ||
[https://www.uniprot.org/uniprot/EPHB_MYCTO EPHB_MYCTO] Could be involved in detoxification of extraneous host-cell epoxides. Catalyzes the hydrolysis of small aromatic epoxide-containing substrates such as trans-1,3-diphenylpropene oxide, trans and cis-stilbene oxide, and terpenoid epoxide.<ref>PMID:18585390</ref> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/e3/2e3j_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=2e3j ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Mycobacterium tuberculosis (Mtb), the intracellular pathogen that infects macrophages primarily, is the causative agent of the infectious disease tuberculosis in humans. The Mtb genome encodes at least six epoxide hydrolases (EHs A to F). EHs convert epoxides to trans-dihydrodiols and have roles in drug metabolism as well as in the processing of signaling molecules. Herein, we report the crystal structures of unbound Mtb EHB and Mtb EHB bound to a potent, low-nanomolar (IC(50) approximately 19 nM) urea-based inhibitor at 2.1 and 2.4 A resolution, respectively. The enzyme is a homodimer; each monomer adopts the classical alpha/beta hydrolase fold that composes the catalytic domain; there is a cap domain that regulates access to the active site. The catalytic triad, comprising Asp104, His333 and Asp302, protrudes from the catalytic domain into the substrate binding cavity between the two domains. The urea portion of the inhibitor is bound in the catalytic cavity, mimicking, in part, the substrate binding; the two urea nitrogen atoms donate hydrogen bonds to the nucleophilic carboxylate of Asp104, and the carbonyl oxygen of the urea moiety receives hydrogen bonds from the phenolic oxygen atoms of Tyr164 and Tyr272. The phenolic oxygen groups of these two residues provide electrophilic assistance during the epoxide hydrolytic cleavage. Upon inhibitor binding, the binding-site residues undergo subtle structural rearrangement. In particular, the side chain of Ile137 exhibits a rotation of around 120 degrees about its C(alpha)-C(beta) bond in order to accommodate the inhibitor. These findings have not only shed light on the enzyme mechanism but also have opened a path for the development of potent inhibitors with good pharmacokinetic profiles against all Mtb EHs of the alpha/beta type. | |||
The molecular structure of epoxide hydrolase B from Mycobacterium tuberculosis and its complex with a urea-based inhibitor.,Biswal BK, Morisseau C, Garen G, Cherney MM, Garen C, Niu C, Hammock BD, James MN J Mol Biol. 2008 Sep 12;381(4):897-912. Epub 2008 Jun 17. PMID:18585390<ref>PMID:18585390</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 2e3j" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Epoxide hydrolase 3D structures|Epoxide hydrolase 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Mycobacterium tuberculosis H37Rv]] | |||
[[Category: Biswal BK]] | |||