4gum

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{{STRUCTURE_4gum| PDB=4gum | SCENE= }}
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==Cystal structure of locked-trimer of human MIF==
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===Cystal structure of locked-trimer of human MIF===
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<StructureSection load='4gum' size='340' side='right' caption='[[4gum]], [[Resolution|resolution]] 2.33&Aring;' scene=''>
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{{ABSTRACT_PUBMED_23776208}}
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== Structural highlights ==
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<table><tr><td colspan='2'>[[4gum]] is a 9 chain structure with sequence from [http://en.wikipedia.org/wiki/Macaca_mulatta Macaca mulatta]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4GUM OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4GUM FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">MIF ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9544 Macaca mulatta])</td></tr>
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<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=4gum FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4gum OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4gum RCSB], [http://www.ebi.ac.uk/pdbsum/4gum PDBsum]</span></td></tr>
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</table>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Macrophage migration inhibitory factor (MIF) is a proinflammatory cytokine. In addition to its known receptor-mediated biological activities, MIF possesses a catalytic site of unknown function between subunits of a homotrimer. Each subunit contributes three beta-strands to adjacent subunits to form a core seven-stranded beta-sheet for each monomer. MIF monomers, dimers, or trimers have been reported, but the active form that binds and activates the MIF receptor (CD74) is still a matter of debate. A cysteine mutant (N110C) that covalently locks MIF into a trimer by forming a disulfide with Cys-80 of an adjacent subunit is used to study this issue. Partial catalytic activity and receptor binding to CD74 are retained by N110C (locked trimer), but there is no cellular signaling. Wild-type MIF-induced cellular signaling, in vivo lung neutrophil accumulation, and alveolar permeability are inhibited with a fivefold excess of N110C. NMR and size-exclusion chromatography with light scattering reveal that N110C can form a higher-order oligomer in equilibrium with a single locked trimer. The X-ray structure confirms a local conformational change that disrupts the subunit interface and results in global changes responsible for the oligomeric form. The structure also confirms these changes are consistent for the partial catalytic and receptor binding activities. The absence of any potential monomer and the retention of partial catalytic and receptor binding activities despite changes in conformation (and dynamics) in the mutant support an endogenous MIF trimer that binds and activates CD74 at nanomolar concentrations. This conclusion has implications for therapeutic development.
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==Function==
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MIF intersubunit disulfide mutant antagonist supports activation of CD74 by endogenous MIF trimer at physiologic concentrations.,Fan C, Rajasekaran D, Syed MA, Leng L, Loria JP, Bhandari V, Bucala R, Lolis EJ Proc Natl Acad Sci U S A. 2013 Jun 17. PMID:23776208<ref>PMID:23776208</ref>
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[[http://www.uniprot.org/uniprot/MIF_MACMU MIF_MACMU]] Pro-inflammatory cytokine. Involved in the innate immune response to bacterial pathogens. The expression of MIF at sites of inflammation suggests a role as mediator in regulating the function of macrophages in host defense. Counteracts the anti-inflammatory activity of glucocorticoids. Has phenylpyruvate tautomerase and dopachrome tautomerase activity (in vitro), but the physiological substrate is not known. It is not clear whether the tautomerase activity has any physiological relevance, and whether it is important for cytokine activity (By similarity).
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==About this Structure==
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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[[4gum]] is a 9 chain structure with sequence from [http://en.wikipedia.org/wiki/Macaca_mulatta Macaca mulatta]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4GUM OCA].
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</div>
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==Reference==
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==See Also==
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<ref group="xtra">PMID:023776208</ref><references group="xtra"/><references/>
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*[[Macrophage inhibitory factor|Macrophage inhibitory factor]]
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Macaca mulatta]]
[[Category: Macaca mulatta]]
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[[Category: Fan, C.]]
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[[Category: Fan, C]]
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[[Category: Lolis, E.]]
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[[Category: Lolis, E]]
[[Category: Alpha/beta mixture]]
[[Category: Alpha/beta mixture]]
[[Category: Cytokine and isomerase]]
[[Category: Cytokine and isomerase]]
[[Category: Isomerase]]
[[Category: Isomerase]]

Revision as of 10:47, 21 December 2014

Cystal structure of locked-trimer of human MIF

4gum, resolution 2.33Å

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