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==THE CRYSTAL STRUCTURE OF A NEW HIGH-CALCIUM FORM OF ANNEXIN V==
==THE CRYSTAL STRUCTURE OF A NEW HIGH-CALCIUM FORM OF ANNEXIN V==
<StructureSection load='1anx' size='340' side='right' caption='[[1anx]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
<StructureSection load='1anx' size='340' side='right'caption='[[1anx]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1anx]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ANX OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ANX FirstGlance]. <br>
<table><tr><td colspan='2'>[[1anx]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ANX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ANX FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.9&#8491;</td></tr>
<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=1anx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1anx OCA], [http://pdbe.org/1anx PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1anx RCSB], [http://www.ebi.ac.uk/pdbsum/1anx PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1anx ProSAT]</span></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>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></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=1anx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1anx OCA], [https://pdbe.org/1anx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1anx RCSB], [https://www.ebi.ac.uk/pdbsum/1anx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1anx ProSAT]</span></td></tr>
</table>
</table>
== Disease ==
== Disease ==
[[http://www.uniprot.org/uniprot/ANXA5_HUMAN ANXA5_HUMAN]] Defects in ANXA5 are associated with susceptibility to pregnancy loss, recurrent, type 3 (RPRGL3) [MIM:[http://omim.org/entry/614391 614391]]. A common complication of pregnancy, resulting in spontaneous abortion before the fetus has reached viability. The term includes all miscarriages from the time of conception until 24 weeks of gestation. Recurrent pregnancy loss is defined as 3 or more consecutive spontaneous abortions.<ref>PMID:17339269</ref>
[https://www.uniprot.org/uniprot/ANXA5_HUMAN ANXA5_HUMAN] Defects in ANXA5 are associated with susceptibility to pregnancy loss, recurrent, type 3 (RPRGL3) [MIM:[https://omim.org/entry/614391 614391]. A common complication of pregnancy, resulting in spontaneous abortion before the fetus has reached viability. The term includes all miscarriages from the time of conception until 24 weeks of gestation. Recurrent pregnancy loss is defined as 3 or more consecutive spontaneous abortions.<ref>PMID:17339269</ref>  
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/ANXA5_HUMAN ANXA5_HUMAN]] This protein is an anticoagulant protein that acts as an indirect inhibitor of the thromboplastin-specific complex, which is involved in the blood coagulation cascade.  
[https://www.uniprot.org/uniprot/ANXA5_HUMAN ANXA5_HUMAN] This protein is an anticoagulant protein that acts as an indirect inhibitor of the thromboplastin-specific complex, which is involved in the blood coagulation cascade.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
Check<jmol>
   <jmolCheckbox>
   <jmolCheckbox>
     <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/an/1anx_consurf.spt"</scriptWhenChecked>
     <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/an/1anx_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
     <text>to colour the structure by Evolutionary Conservation</text>
Line 21: Line 22:
</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=1anx 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=1anx ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Annexin V was crystallized in the presence of a high concentration of calcium and the structure refined at 1.9 A resolution. The crystals are triclinic (P1) with three molecules per asymmetric unit and pseudo-R3 symmetry, reflecting a tendency of annexin to form trimers. The overall structure of the protein is similar to that seen in other crystal forms. There are, however, significant changes in domain III, where a new calcium site is formed. The whole region surrounding this site is reorganized in our structure, rendering annexin V more symmetrical and more alike annexin I. The formation of the new calcium site causes the displacement of Trp187 from a buried to an exposed conformation, a change that has recently been demonstrated by fluorescence measurements. The affinity of the different potential calcium sites is modulated: there is no calcium bound in domains II and IV, while up to two secondary calcium ions sites (in domains I and III) can substitute, depending on the calcium concentration present. We suggest that annexin can act as a calcium buffer, binding or releasing calcium depending on its local concentration. Our results also show that annexin displays inherent mobility which, together with its capacity to modulate the calcium affinity of its sites, can be of importance for its function on the membrane surface.


The crystal structure of a new high-calcium form of annexin V.,Sopkova J, Renouard M, Lewit-Bentley A J Mol Biol. 1993 Dec 5;234(3):816-25. PMID:8254674<ref>PMID:8254674</ref>
==See Also==
 
*[[Annexin 3D structures|Annexin 3D structures]]
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1anx" style="background-color:#fffaf0;"></div>
== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Human]]
[[Category: Homo sapiens]]
[[Category: Lewit-Bentley, A]]
[[Category: Large Structures]]
[[Category: Renouard, M]]
[[Category: Lewit-Bentley A]]
[[Category: Sopkova, J]]
[[Category: Renouard M]]
[[Category: Calcium-phospholipid-binding protein complex]]
[[Category: Sopkova J]]
[[Category: Calcium/phospholipid-binding protein]]

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