1fi5: Difference between revisions

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[[Image:1fi5.gif|left|200px]]
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[[Image:1fi5.png|left|200px]]


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{{STRUCTURE_1fi5|  PDB=1fi5  |  SCENE=  }}  
{{STRUCTURE_1fi5|  PDB=1fi5  |  SCENE=  }}  


'''NMR STRUCTURE OF THE C TERMINAL DOMAIN OF CARDIAC TROPONIN C BOUND TO THE N TERMINAL DOMAIN OF CARDIAC TROPONIN I.'''
===NMR STRUCTURE OF THE C TERMINAL DOMAIN OF CARDIAC TROPONIN C BOUND TO THE N TERMINAL DOMAIN OF CARDIAC TROPONIN I.===




==Overview==
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The N-terminal domain of cardiac troponin I (cTnI) comprising residues 33-80 and lacking the cardiac-specific amino terminus forms a stable binary complex with the C-terminal domain of cardiac troponin C (cTnC) comprising residues 81-161. We have utilized heteronuclear multidimensional NMR to assign the backbone and side-chain resonances of Ca2+-saturated cTnC(81-161) both free and bound to cTnI(33-80). No significant differences were observed between secondary structural elements determined for free and cTnI(33-80)-bound cTnC(81-161). We have determined solution structures of Ca2+-saturated cTnC(81-161) free and bound to cTnI(33-80). While the tertiary structure of cTnC(81-161) is qualitatively similar to that observed free in solution, the binding of cTnI(33-80) results mainly in an opening of the structure and movement of the loop region between helices F and G. Together, these movements provide the binding site for the N-terminal domain of cTnI. The putative binding site for cTnI(33-80) was determined by mapping amide proton and nitrogen chemical shift changes, induced by the binding of cTnI(33-80), onto the C-terminal cTnC structure. The binding interface for cTnI(33-80), as suggested from chemical shift changes, involves predominantly hydrophobic interactions located in the expanded hydrophobic pocket. The largest chemical shift changes were observed in the loop region connecting helices F and G. Inspection of available TnC sequences reveals that these residues are highly conserved, suggesting a common binding motif for the Ca2+/Mg2+-dependent interaction site in the TnC/TnI complex.
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{{ABSTRACT_PUBMED_10387077}}


==About this Structure==
==About this Structure==
1FI5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1ggs 1ggs]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FI5 OCA].  
1FI5 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1ggs 1ggs]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FI5 OCA].  


==Reference==
==Reference==
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[[Category: Muscle protein]]
[[Category: Muscle protein]]
[[Category: Troponin c-troponin i interaction]]
[[Category: Troponin c-troponin i interaction]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 16:21:09 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 03:16:56 2008''

Revision as of 00:16, 1 July 2008

File:1fi5.png

Template:STRUCTURE 1fi5

NMR STRUCTURE OF THE C TERMINAL DOMAIN OF CARDIAC TROPONIN C BOUND TO THE N TERMINAL DOMAIN OF CARDIAC TROPONIN I.

Template:ABSTRACT PUBMED 10387077

About this Structure

1FI5 is a Single protein structure of sequence from Gallus gallus. This structure supersedes the now removed PDB entry 1ggs. Full experimental information is available from OCA.

Reference

Solution structures of the C-terminal domain of cardiac troponin C free and bound to the N-terminal domain of cardiac troponin I., Gasmi-Seabrook GM, Howarth JW, Finley N, Abusamhadneh E, Gaponenko V, Brito RM, Solaro RJ, Rosevear PR, Biochemistry. 1999 Jun 29;38(26):8313-22. PMID:10387077

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