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==Solution structure of MerB, the Organomercurial Lyase involved in the bacterial mercury resistance system==
==Solution structure of MerB, the Organomercurial Lyase involved in the bacterial mercury resistance system==
<StructureSection load='1s6l' size='340' side='right'caption='[[1s6l]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
<StructureSection load='1s6l' size='340' side='right'caption='[[1s6l]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1s6l]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"bacillus_coli"_migula_1895 "bacillus coli" migula 1895]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S6L OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1S6L FirstGlance]. <br>
<table><tr><td colspan='2'>[[1s6l]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S6L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1S6L FirstGlance]. <br>
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MERB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 "Bacillus coli" Migula 1895])</td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Alkylmercury_lyase Alkylmercury lyase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.99.1.2 4.99.1.2] </span></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=1s6l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s6l OCA], [https://pdbe.org/1s6l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1s6l RCSB], [https://www.ebi.ac.uk/pdbsum/1s6l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1s6l ProSAT]</span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1s6l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s6l OCA], [http://pdbe.org/1s6l PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1s6l RCSB], [http://www.ebi.ac.uk/pdbsum/1s6l PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1s6l ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/MERB_ECOLX MERB_ECOLX]] Cleaves the carbon-mercury bond of organomercurials such as phenylmercuric acetate. One product is Hg(2+), which is subsequently detoxified by the mercuric reductase (By similarity).  
[https://www.uniprot.org/uniprot/MERB_ECOLX MERB_ECOLX] Cleaves the carbon-mercury bond of organomercurials such as phenylmercuric acetate. One product is Hg(2+), which is subsequently detoxified by the mercuric reductase (By similarity).
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1s6l ConSurf].
</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=1s6l ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mercury resistant bacteria have developed a system of two enzymes (MerA and MerB), which allows them to efficiently detoxify both ionic and organomercurial compounds. The organomercurial lyase (MerB) catalyzes the protonolysis of the carbon-mercury bond resulting in the formation of ionic mercury and a reduced hydrocarbon. The ionic mercury [Hg(II)] is subsequently reduced to the less reactive elemental mercury [Hg(0)] by a specific mercuric reductase (MerA). To better understand MerB's unique enzymatic activity, we used nuclear magnetic resonance (NMR) spectroscopy to determine the structure of the free enzyme. MerB is characterized by a novel protein fold consisting of three noninteracting antiparallel beta-sheets surrounded by six alpha-helices. By comparing the NMR data of free MerB and the MerB/Hg/DTT complex, we identified a set of residues that likely define a Hg/DTT binding site. These residues cluster around two cysteines (C(96) and C(159)) that are crucial to MerB's catalytic activity. A detailed analysis of the structure revealed the presence of an extensive hydrophobic groove adjacent to this Hg/DTT binding site. This extensive hydrophobic groove has the potential to interact with the hydrocarbon moiety of a wide variety of substrates and may explain the broad substrate specificity of MerB.
NMR structural studies reveal a novel protein fold for MerB, the organomercurial lyase involved in the bacterial mercury resistance system.,Di Lello P, Benison GC, Valafar H, Pitts KE, Summers AO, Legault P, Omichinski JG Biochemistry. 2004 Jul 6;43(26):8322-32. PMID:15222745<ref>PMID:15222745</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1s6l" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Bacillus coli migula 1895]]
[[Category: Escherichia coli]]
[[Category: Alkylmercury lyase]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Benison, G C]]
[[Category: Benison GC]]
[[Category: Legault, P]]
[[Category: Di Lello P]]
[[Category: Lello, P Di]]
[[Category: Legault P]]
[[Category: Omichinski, J G]]
[[Category: Omichinski JG]]
[[Category: Pitts, K E]]
[[Category: Pitts KE]]
[[Category: Summers, A O]]
[[Category: Summers AO]]
[[Category: Valafar, H]]
[[Category: Valafar H]]
[[Category: Lyase]]

Latest revision as of 06:34, 1 May 2024

Solution structure of MerB, the Organomercurial Lyase involved in the bacterial mercury resistance system

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