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==CALCIUM-BOUND E41A MUTANT OF THE N-DOMAIN OF CHICKEN TROPONIN C, NMR, 40 STRUCTURES==
==CALCIUM-BOUND E41A MUTANT OF THE N-DOMAIN OF CHICKEN TROPONIN C, NMR, 40 STRUCTURES==
<StructureSection load='1smg' size='340' side='right'caption='[[1smg]], [[NMR_Ensembles_of_Models | 40 NMR models]]' scene=''>
<StructureSection load='1smg' size='340' side='right'caption='[[1smg]]' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1smg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Chick Chick]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SMG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SMG FirstGlance]. <br>
<table><tr><td colspan='2'>[[1smg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1SMG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SMG FirstGlance]. <br>
</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>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1smg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1smg OCA], [https://pdbe.org/1smg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1smg RCSB], [https://www.ebi.ac.uk/pdbsum/1smg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1smg ProSAT]</span></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=1smg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1smg OCA], [https://pdbe.org/1smg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1smg RCSB], [https://www.ebi.ac.uk/pdbsum/1smg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1smg ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== 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.  
[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 ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1smg 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=1smg ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The structural transition in troponin C induced by the binding of two calcium ions involves an "opening" of the structure, an event that triggers skeletal muscle contraction. We have solved the solution structure of a mutant (E41A) of the regulatory domain of skeletal troponin C wherein one bidentate ligand to the calcium in site I is missing. This structure remains "closed" upon calcium binding, indicating that the linkage between calcium binding and the induced conformational change has been broken. This provides a snapshot of skeletal troponin C between the off and on state and thereby valuable insight into the mechanism of regulation within skeletal TnC. Although several factors contribute to the triggering mechanism, the opening of the troponin C structure is ultimately dependent on one amino acid, Glu41. Insights into the structure of cardiac troponin C can also be derived from this skeletal mutant.
Mechanism of direct coupling between binding and induced structural change in regulatory calcium binding proteins.,Gagne SM, Li MX, Sykes BD Biochemistry. 1997 Apr 15;36(15):4386-92. PMID:9109645<ref>PMID:9109645</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1smg" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Troponin|Troponin]]
*[[Troponin 3D structures|Troponin 3D structures]]
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Chick]]
[[Category: Gallus gallus]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Gagne, S M]]
[[Category: Gagne SM]]
[[Category: Li, M X]]
[[Category: Li MX]]
[[Category: Sykes, B D]]
[[Category: Sykes BD]]
[[Category: Calcium-binding protein]]
[[Category: Muscle protein]]
[[Category: Troponin c]]

Revision as of 11:33, 1 May 2024

CALCIUM-BOUND E41A MUTANT OF THE N-DOMAIN OF CHICKEN TROPONIN C, NMR, 40 STRUCTURESCALCIUM-BOUND E41A MUTANT OF THE N-DOMAIN OF CHICKEN TROPONIN C, NMR, 40 STRUCTURES

Structural highlights

1smg is a 1 chain structure with sequence from Gallus gallus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

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

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

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OCA
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