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==Crystal structure of skeletal muscle troponin in the Ca2+-free state==
==Crystal structure of skeletal muscle troponin in the Ca2+-free state==
<StructureSection load='1yv0' size='340' side='right' caption='[[1yv0]], [[Resolution|resolution]] 7.00&Aring;' scene=''>
<StructureSection load='1yv0' size='340' side='right'caption='[[1yv0]], [[Resolution|resolution]] 7.00&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1yv0]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/Chick Chick]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1YV0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1YV0 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1yv0]] is a 3 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=1YV0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1YV0 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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]] 7&#8491;</td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1ytz|1ytz]]</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">TNNC2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9031 CHICK])</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=1yv0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yv0 OCA], [https://pdbe.org/1yv0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1yv0 RCSB], [https://www.ebi.ac.uk/pdbsum/1yv0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1yv0 ProSAT]</span></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=1yv0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1yv0 OCA], [http://pdbe.org/1yv0 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1yv0 RCSB], [http://www.ebi.ac.uk/pdbsum/1yv0 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1yv0 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[http://www.uniprot.org/uniprot/TNNT3_CHICK TNNT3_CHICK]] Troponin T is the tropomyosin-binding subunit of troponin, the thin filament regulatory complex which confers calcium-sensitivity to striated muscle actomyosin ATPase activity. [[http://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. [[http://www.uniprot.org/uniprot/TNNI2_CHICK TNNI2_CHICK]] Troponin I is the inhibitory subunit of troponin, the thin filament regulatory complex which confers calcium-sensitivity to striated muscle actomyosin ATPase activity.  
[https://www.uniprot.org/uniprot/TNNT3_CHICK TNNT3_CHICK] Troponin T is the tropomyosin-binding subunit of troponin, the thin filament regulatory complex which confers calcium-sensitivity to striated muscle actomyosin ATPase activity.
== 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=1yv0 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=1yv0 ConSurf].
<div style="clear:both"></div>
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Troponin senses Ca2+ to regulate contraction in striated muscle. Structures of skeletal muscle troponin composed of TnC (the sensor), TnI (the regulator), and TnT (the link to the muscle thin filament) have been determined. The structure of troponin in the Ca(2+)-activated state features a nearly twofold symmetrical assembly of TnI and TnT subunits penetrated asymmetrically by the dumbbell-shaped TnC subunit. Ca ions are thought to regulate contraction by controlling the presentation to and withdrawal of the TnI inhibitory segment from the thin filament. Here, we show that the rigid central helix of the sensor binds the inhibitory segment of TnI in the Ca(2+)-activated state. Comparison of crystal structures of troponin in the Ca(2+)-activated state at 3.0 angstroms resolution and in the Ca(2+)-free state at 7.0 angstroms resolution shows that the long framework helices of TnI and TnT, presumed to be a Ca(2+)-independent structural domain of troponin are unchanged. Loss of Ca ions causes the rigid central helix of the sensor to collapse and to release the inhibitory segment of TnI. The inhibitory segment of TnI changes conformation from an extended loop in the presence of Ca2+ to a short alpha-helix in its absence. We also show that Anapoe, a detergent molecule, increases the contractile force of muscle fibers and binds specifically, together with the TnI switch helix, in a hydrophobic pocket of TnC upon activation by Ca ions.
Ca(2+)-regulated structural changes in troponin.,Vinogradova MV, Stone DB, Malanina GG, Karatzaferi C, Cooke R, Mendelson RA, Fletterick RJ Proc Natl Acad Sci U S A. 2005 Apr 5;102(14):5038-43. Epub 2005 Mar 22. PMID:15784741<ref>PMID:15784741</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1yv0" style="background-color:#fffaf0;"></div>


==See Also==
==See Also==
*[[Role of Troponin C in decreased muscle sensitivity to calcium|Role of Troponin C in decreased muscle sensitivity to calcium]]
*[[Troponin|Troponin]]
*[[Troponin|Troponin]]
== References ==
*[[Troponin 3D structures|Troponin 3D structures]]
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Chick]]
[[Category: Gallus gallus]]
[[Category: Cooke, R]]
[[Category: Large Structures]]
[[Category: Fletterick, R J]]
[[Category: Cooke R]]
[[Category: Karatzaferi, C]]
[[Category: Fletterick RJ]]
[[Category: Malanina, G G]]
[[Category: Karatzaferi C]]
[[Category: Mendelson, R A]]
[[Category: Malanina GG]]
[[Category: Stone, D B]]
[[Category: Mendelson RA]]
[[Category: Vinogradova, M V]]
[[Category: Stone DB]]
[[Category: Actin binding]]
[[Category: Vinogradova MV]]
[[Category: Contractile protein]]
[[Category: Muscle]]
[[Category: Off state]]
[[Category: Thin filament]]
[[Category: Troponin]]

Latest revision as of 12:00, 14 February 2024

Crystal structure of skeletal muscle troponin in the Ca2+-free stateCrystal structure of skeletal muscle troponin in the Ca2+-free state

Structural highlights

1yv0 is a 3 chain structure with sequence from Gallus gallus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 7Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TNNT3_CHICK Troponin T is the tropomyosin-binding subunit of troponin, the thin filament regulatory complex which confers calcium-sensitivity to striated muscle actomyosin ATPase activity.

Evolutionary Conservation

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

See Also

1yv0, resolution 7.00Å

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