2cm4: Difference between revisions
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[[Image: | ==THE COMPLEMENT INHIBITOR OMCI IN COMPLEX WITH RICINOLEIC ACID== | ||
<StructureSection load='2cm4' size='340' side='right' caption='[[2cm4]], [[Resolution|resolution]] 1.90Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[2cm4]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Ornithodoros_moubata Ornithodoros moubata]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2CM4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2CM4 FirstGlance]. <br> | |||
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=RCL:RICINOLEIC+ACID'>RCL</scene><br> | |||
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2cm9|2cm9]]</td></tr> | |||
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2cm4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2cm4 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2cm4 RCSB], [http://www.ebi.ac.uk/pdbsum/2cm4 PDBsum]</span></td></tr> | |||
<table> | |||
== 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/cm/2cm4_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/chain_selection.php?pdb_ID=2ata ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
The complement (C) system is a potent innate immune defence system against parasites. We have recently characterised and expressed OmCI, a 16 kDa protein derived from the soft tick Ornithodoros moubata that specifically binds C5, thereby preventing C activation. The structure of recombinant OmCI determined at 1.9 A resolution confirms a lipocalin fold and reveals that the protein binds a fatty acid derivative that we have identified by mass spectrometry as ricinoleic acid. We propose that OmCI could sequester one of the fatty acid-derived inflammatory modulators from the host plasma, thereby interfering with the host inflammatory response to the tick bite. Mapping of sequence differences between OmCI and other tick lipocalins with different functions, combined with biochemical investigations of OmCI activity, supports the hypothesis that OmCI acts by preventing interaction with the C5 convertase, rather than by blocking the C5a cleavage site. | |||
The structure of OMCI, a novel lipocalin inhibitor of the complement system.,Roversi P, Lissina O, Johnson S, Ahmat N, Paesen GC, Ploss K, Boland W, Nunn MA, Lea SM J Mol Biol. 2007 Jun 8;369(3):784-93. Epub 2007 Mar 30. PMID:17445829<ref>PMID:17445829</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
== | |||
< | |||
[[Category: Ornithodoros moubata]] | [[Category: Ornithodoros moubata]] | ||
[[Category: Boland, W.]] | [[Category: Boland, W.]] | ||
Revision as of 04:47, 30 September 2014
THE COMPLEMENT INHIBITOR OMCI IN COMPLEX WITH RICINOLEIC ACIDTHE COMPLEMENT INHIBITOR OMCI IN COMPLEX WITH RICINOLEIC ACID
Structural highlights
Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe complement (C) system is a potent innate immune defence system against parasites. We have recently characterised and expressed OmCI, a 16 kDa protein derived from the soft tick Ornithodoros moubata that specifically binds C5, thereby preventing C activation. The structure of recombinant OmCI determined at 1.9 A resolution confirms a lipocalin fold and reveals that the protein binds a fatty acid derivative that we have identified by mass spectrometry as ricinoleic acid. We propose that OmCI could sequester one of the fatty acid-derived inflammatory modulators from the host plasma, thereby interfering with the host inflammatory response to the tick bite. Mapping of sequence differences between OmCI and other tick lipocalins with different functions, combined with biochemical investigations of OmCI activity, supports the hypothesis that OmCI acts by preventing interaction with the C5 convertase, rather than by blocking the C5a cleavage site. The structure of OMCI, a novel lipocalin inhibitor of the complement system.,Roversi P, Lissina O, Johnson S, Ahmat N, Paesen GC, Ploss K, Boland W, Nunn MA, Lea SM J Mol Biol. 2007 Jun 8;369(3):784-93. Epub 2007 Mar 30. PMID:17445829[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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