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[[Image:1wy9.gif|left|200px]]<br /><applet load="1wy9" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1wy9, resolution 2.10&Aring;" />
'''Crystal structure of microglia-specific protein, Iba1'''<br />


==Overview==
==Crystal structure of microglia-specific protein, Iba1==
The ionized calcium-binding adaptor molecule 1 (Iba1) with 147 amino acid residues has been identified as a calcium-binding protein, expressed specifically in microglia/macrophages, and is expected to be a key factor in membrane ruffling, which is a typical feature of activated microglia. We have determined the crystal structure of human Iba1 in a Ca(2+)-free form and mouse Iba1 in a Ca(2+)-bound form, to a resolution of 1.9 A and 2.1 A, respectively. X-ray structures of Iba1 revealed a compact, single-domain protein with two EF-hand motifs, showing similarity in overall topology to partial structures of the classical EF-hand proteins troponin C and calmodulin. In mouse Iba1, the second EF-hand contains a bound Ca(2+), but the first EF-hand does not, which is often the case in S100 proteins, suggesting that Iba1 has S100 protein-like EF-hands. The molecular conformational change induced by Ca(2+)-binding of Iba1 is different from that found in the classical EF-hand proteins and/or S100 proteins, which demonstrates that Iba1 has an unique molecular switching mechanism dependent on Ca(2+)-binding, to interact with target molecules.
<StructureSection load='1wy9' size='340' side='right'caption='[[1wy9]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
 
== Structural highlights ==
==About this Structure==
<table><tr><td colspan='2'>[[1wy9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WY9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1WY9 FirstGlance]. <br>
1WY9 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus] with <scene name='pdbligand=CA:'>CA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1WY9 OCA].  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.1&#8491;</td></tr>
 
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>
==Reference==
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1wy9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1wy9 OCA], [https://pdbe.org/1wy9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1wy9 RCSB], [https://www.ebi.ac.uk/pdbsum/1wy9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1wy9 ProSAT]</span></td></tr>
X-ray structures of the microglia/macrophage-specific protein Iba1 from human and mouse demonstrate novel molecular conformation change induced by calcium binding., Yamada M, Ohsawa K, Imai Y, Kohsaka S, Kamitori S, J Mol Biol. 2006 Dec 1;364(3):449-57. Epub 2006 Sep 15. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=17011575 17011575]
</table>
== Function ==
[https://www.uniprot.org/uniprot/AIF1_MOUSE AIF1_MOUSE] Actin-binding protein that enhances membrane ruffling and RAC activation. Enhances the actin-bundling activity of LCP1. Binds calcium. Plays a role in RAC signaling and in phagocytosis. May play a role in macrophage activation and function. Promotes the proliferation of vascular smooth muscle cells and of T-lymphocytes. Enhances lymphocyte migration. Plays a role in vascular inflammation.<ref>PMID:11722645</ref> <ref>PMID:10934045</ref> <ref>PMID:11500035</ref> <ref>PMID:11916959</ref> <ref>PMID:14756805</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/wy/1wy9_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=1wy9 ConSurf].
<div style="clear:both"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Mus musculus]]
[[Category: Single protein]]
[[Category: Imai Y]]
[[Category: Imai, Y.]]
[[Category: Kamitori S]]
[[Category: Kamitori, S.]]
[[Category: Kohsaka S]]
[[Category: Kohsaka, S.]]
[[Category: Yamada M]]
[[Category: Yamada, M.]]
[[Category: CA]]
[[Category: calucium binding]]
[[Category: ef-hand]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 15:49:19 2008''

Latest revision as of 13:35, 13 March 2024

Crystal structure of microglia-specific protein, Iba1

1wy9, resolution 2.10Å

Drag the structure with the mouse to rotate

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