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[[Image:1k9p.gif|left|200px]]
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{{STRUCTURE_1k9p|  PDB=1k9p  |  SCENE=  }}
'''CRYSTAL STRUCTURE OF CALCIUM FREE (OR APO) HUMAN S100A6'''


==CRYSTAL STRUCTURE OF CALCIUM FREE (OR APO) HUMAN S100A6==
<StructureSection load='1k9p' size='340' side='right'caption='[[1k9p]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1k9p]] is a 1 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=1K9P OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1K9P FirstGlance]. <br>
</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='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BME:BETA-MERCAPTOETHANOL'>BME</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=1k9p FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k9p OCA], [https://pdbe.org/1k9p PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1k9p RCSB], [https://www.ebi.ac.uk/pdbsum/1k9p PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1k9p ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/S10A6_HUMAN S10A6_HUMAN] May function as calcium sensor and contribute to cellular calcium signaling (Potential). May function by interacting with other proteins and indirectly play a role in the reorganization of the actin cytoskeleton and in cell motility. Binds 2 calcium ions. Calcium binding is cooperative.
== 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/k9/1k9p_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=1k9p ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
S100A6 is a member of the S100 family of Ca(2+) binding proteins, which have come to play an important role in the diagnosis of cancer due to their overexpression in various tumor cells. We have determined the crystal structures of human S100A6 in the Ca(2+)-free and Ca(2+)-bound states to resolutions of 1.15 A and 1.44 A, respectively. Ca(2+) binding is responsible for a dramatic change in the global shape and charge distribution of the S100A6 dimer, leading to the exposure of two symmetrically positioned target binding sites. The results are consistent with S100A6, and most likely other S100 proteins, functioning as Ca(2+) sensors in a way analogous to the prototypical sensors calmodulin and troponin C. The structures have important implications for our understanding of target binding and cooperativity of Ca(2+) binding in the S100 family.


==Overview==
Crystal structures of S100A6 in the Ca(2+)-free and Ca(2+)-bound states: the calcium sensor mechanism of S100 proteins revealed at atomic resolution.,Otterbein LR, Kordowska J, Witte-Hoffmann C, Wang CL, Dominguez R Structure. 2002 Apr;10(4):557-67. PMID:11937060<ref>PMID:11937060</ref>
S100A6 is a member of the S100 family of Ca(2+) binding proteins, which have come to play an important role in the diagnosis of cancer due to their overexpression in various tumor cells. We have determined the crystal structures of human S100A6 in the Ca(2+)-free and Ca(2+)-bound states to resolutions of 1.15 A and 1.44 A, respectively. Ca(2+) binding is responsible for a dramatic change in the global shape and charge distribution of the S100A6 dimer, leading to the exposure of two symmetrically positioned target binding sites. The results are consistent with S100A6, and most likely other S100 proteins, functioning as Ca(2+) sensors in a way analogous to the prototypical sensors calmodulin and troponin C. The structures have important implications for our understanding of target binding and cooperativity of Ca(2+) binding in the S100 family.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1K9P is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K9P OCA].
</div>
<div class="pdbe-citations 1k9p" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
Crystal structures of S100A6 in the Ca(2+)-free and Ca(2+)-bound states: the calcium sensor mechanism of S100 proteins revealed at atomic resolution., Otterbein LR, Kordowska J, Witte-Hoffmann C, Wang CL, Dominguez R, Structure. 2002 Apr;10(4):557-67. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/11937060 11937060]
*[[S100 proteins 3D structures|S100 proteins 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Dominguez, R.]]
[[Category: Dominguez R]]
[[Category: Otterbein, L R.]]
[[Category: Otterbein LR]]
[[Category: Apo]]
[[Category: Cacy]]
[[Category: Calcium free]]
[[Category: Calcium regulatory protein]]
[[Category: Calcyclin]]
[[Category: S100a6]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May  2 22:28:41 2008''

Latest revision as of 08:54, 16 August 2023

CRYSTAL STRUCTURE OF CALCIUM FREE (OR APO) HUMAN S100A6

1k9p, resolution 1.90Å

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