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[[Image:1ncx.jpg|left|200px]]


{{Structure
==TROPONIN C==
|PDB= 1ncx |SIZE=350|CAPTION= <scene name='initialview01'>1ncx</scene>, resolution 1.8&Aring;
<StructureSection load='1ncx' size='340' side='right'caption='[[1ncx]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND= <scene name='pdbligand=CD:CADMIUM+ION'>CD</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>
<table><tr><td colspan='2'>[[1ncx]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NCX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1NCX FirstGlance]. <br>
|ACTIVITY=  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
|GENE=  
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CD:CADMIUM+ION'>CD</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
|DOMAIN=
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1ncx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ncx OCA], [https://pdbe.org/1ncx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ncx RCSB], [https://www.ebi.ac.uk/pdbsum/1ncx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ncx ProSAT]</span></td></tr>
|RELATEDENTRY=
</table>
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ncx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ncx OCA], [http://www.ebi.ac.uk/pdbsum/1ncx PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ncx RCSB]</span>
== Function ==
}}
[https://www.uniprot.org/uniprot/TNNC2_CHICK TNNC2_CHICK] Troponin is the central regulatory protein of striated muscle contraction. Tn consists of three components: Tn-I which is the inhibitor of actomyosin ATPase, Tn-T which contains the binding site for tropomyosin and Tn-C. The binding of calcium to Tn-C abolishes the inhibitory action of Tn on actin filaments.
== 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/nc/1ncx_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=1ncx ConSurf].
<div style="clear:both"></div>


'''TROPONIN C'''
==See Also==
 
*[[Troponin 3D structures|Troponin 3D structures]]
 
__TOC__
==Overview==
</StructureSection>
The crystal structures of three metal complexes of troponin C (TnC) have been determined and refined where the two occupied structural Ca(2+) sites in the C domain have been substituted by Mn(2+), Cd(2+) and Tb(3+). The X-ray intensity data were collected to 2.1, 1.8 and 1.8 A resolution, respectively, on the three metal complexes, which are isomorphous with Ca-TnC. The three complexes have r.m.s. deviations of 0.27, 0.25 and 0.35 A, respectively, for all protein atoms, from Ca-TnC. Irrespective of the charge on the metal (+2 or +3), the occupied sites 3 and 4 exhibit a distorted pentagonal bipyramidal coordination, like Ca-TnC, with seven ligands, six from the 12-residue binding loop and the seventh from a water molecule. Mn(2+) at site 4 seems to display a longer distance to one of the carboxyl bidentate ligands representing an intermediate coordination simulating the six-coordinate Mg(2+). The carboxyl O atoms of the bidentate Glu12 are displaced on the side of the equatorial plane passing through the remaining three ligands with one O atom closer to the plane (Delta of 0.11 to 0.76 A) than the other (Delta of 0.93 to 1.38 A). The two axial ligands are an aspartic carboxyl O atom and a water molecule. The metal is displaced (0.18 to 0.56 A) towards the water facing the water channel.
 
==About this Structure==
1NCX is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NCX OCA].
 
==Reference==
X-ray structures of Mn, Cd and Tb metal complexes of troponin C., Rao ST, Satyshur KA, Greaser ML, Sundaralingam M, Acta Crystallogr D Biol Crystallogr. 1996 Sep 1;52(Pt 5):916-22. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15299599 15299599]
[[Category: Gallus gallus]]
[[Category: Gallus gallus]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Rao, S T.]]
[[Category: Rao ST]]
[[Category: Sundaralingam, M.]]
[[Category: Sundaralingam M]]
[[Category: calcium-binding protein]]
[[Category: duplication]]
[[Category: muscle protein]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:28:36 2008''

Latest revision as of 07:55, 14 February 2024

TROPONIN C

1ncx, resolution 1.80Å

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