1s6l: Difference between revisions

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-[[Image:1s6l.gif|left|200px]]
+{{Seed}}
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 {{STRUCTURE_1s6l|  PDB=1s6l  |  SCENE=  }}
-'''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===
-==Overview==
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-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.
+The line below this paragraph, {{ABSTRACT_PUBMED_15222745}}, adds the Publication Abstract to the page
+(as it appears on PubMed at http://www.pubmed.gov), where 15222745 is the PubMed ID number.
+-->
+{{ABSTRACT_PUBMED_15222745}}
 ==About this Structure==
-S6L is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S6L OCA].
+S6L is a [[Single protein]] structure of sequence from [http://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].
 ==Reference==
 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:[http://www.ncbi.nlm.nih.gov/pubmed/15222745 15222745]
+H, 15N, and 13C resonance assignment of the 23 kDa organomercurial lyase MerB in its free and mercury-bound forms., Di Lello P, Benison GC, Omichinski JG, Legault P, J Biomol NMR. 2004 Jul;29(3):457-8. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15213467 15213467]
 [[Category: Alkylmercury lyase]]
 [[Category: Escherichia coli]]
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 [[Category: Valafar, H.]]
 [[Category: Lyase]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 08:21:48 2008''
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 11:38:36 2008''