The calcium-induced structural changes in the skeletal muscle regulatory protein troponin C involve a transition from a closed to an open structure with the concomitant exposure of a large hydrophobic interaction site for target proteins. NMR solution structural studies have served to define this conformational change and elucidate the mechanism of the linkage between calcium binding and the induced structural changes. These structural movements are described in terms of interhelical angles in these largely helical proteins. Oddly, the most recent structure of the cardiac system challenges the central paradigm because the calcium-bound structures are not open. The kinetics, energetics, and dynamics of these proteins have also been investigated using NMR.
[NMR paper] The interaction of the bisphosphorylated N-terminal arm of cardiac troponin I-A 31P-N
The interaction of the bisphosphorylated N-terminal arm of cardiac troponin I-A 31P-NMR study.
Related Articles The interaction of the bisphosphorylated N-terminal arm of cardiac troponin I-A 31P-NMR study.
FEBS Lett. 2002 Feb 27;513(2-3):289-93
Authors: Schmidtmann A, Lohmann K, Jaquet K
Cardiac troponin I, the inhibitory subunit of the heterotrimeric cardiac troponin (cTn) complex is phosphorylated by protein kinase A at two serine residues located in its heart-specific N-terminal extension. This flexible arm interacts at different sites...
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[NMR paper] NMR solution structure of a synthetic troponin C heterodimeric domain.
NMR solution structure of a synthetic troponin C heterodimeric domain.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--pubs.acs.org-images-acspubs.jpg Related Articles NMR solution structure of a synthetic troponin C heterodimeric domain.
Biochemistry. 1996 Jun 11;35(23):7429-38
Authors: Shaw GS, Sykes BD
The C-terminal domain from the muscle protein troponin C (TnC) comprises two helix-loop-helix calcium-binding sites (residues 90-162). The assembly of these two sites is governed by calcium binding enabling a synthetic C-terminal...
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[NMR paper] Cardiac troponin I induced conformational changes in cardiac troponin C as monitored
Cardiac troponin I induced conformational changes in cardiac troponin C as monitored by NMR using site-directed spin and isotope labeling.
Related Articles Cardiac troponin I induced conformational changes in cardiac troponin C as monitored by NMR using site-directed spin and isotope labeling.
Biochemistry. 1995 Oct 17;34(41):13343-52
Authors: Kleerekoper Q, Howarth JW, Guo X, Solaro RJ, Rosevear PR
Conformational changes in both free cardiac troponin C (cTnC) and in complex with a recombinant troponin I protein were observed by means of a...
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[NMR paper] NMR studies delineating spatial relationships within the cardiac troponin I-troponin
NMR studies delineating spatial relationships within the cardiac troponin I-troponin C complex.
Related Articles NMR studies delineating spatial relationships within the cardiac troponin I-troponin C complex.
J Biol Chem. 1994 Sep 23;269(38):23731-5
Authors: Krudy GA, Kleerekoper Q, Guo X, Howarth JW, Solaro RJ, Rosevear PR
NMR spectroscopy and selective isotope labeling of both recombinant cardiac troponin C (cTnC3) and a truncated cardiac troponin I (cTnI/NH2) lacking the N-terminal 32-amino acid cardiac-specific sequence have been used to...
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[NMR paper] Interaction of troponin I and troponin C: 19F NMR studies of the binding of the inhib
Interaction of troponin I and troponin C: 19F NMR studies of the binding of the inhibitory troponin I peptide to turkey skeletal troponin C.
Related Articles Interaction of troponin I and troponin C: 19F NMR studies of the binding of the inhibitory troponin I peptide to turkey skeletal troponin C.
Biochem Cell Biol. 1991 Sep;69(9):674-81
Authors: Campbell AP, Cachia PJ, Sykes BD
We have used 19F nuclear magnetic resonance spectroscopy to study the interaction of the inhibitory region of troponin (TnI) with apo- and calcium(II)-saturated turkey...
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[NMR paper] Interaction of troponin I and troponin C: 19F NMR studies of the binding of the inhib
Interaction of troponin I and troponin C: 19F NMR studies of the binding of the inhibitory troponin I peptide to turkey skeletal troponin C.
Related Articles Interaction of troponin I and troponin C: 19F NMR studies of the binding of the inhibitory troponin I peptide to turkey skeletal troponin C.
Biochem Cell Biol. 1991 Sep;69(9):674-81
Authors: Campbell AP, Cachia PJ, Sykes BD
We have used 19F nuclear magnetic resonance spectroscopy to study the interaction of the inhibitory region of troponin (TnI) with apo- and calcium(II)-saturated turkey...
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[NMR paper] Sites phosphorylated in bovine cardiac troponin T and I. Characterization by 31P-NMR
Sites phosphorylated in bovine cardiac troponin T and I. Characterization by 31P-NMR spectroscopy and phosphorylation by protein kinases.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--www3.interscience.wiley.com-aboutus-images-wiley_interscience_pubmed_logo_FREE_120x27.gif Related Articles Sites phosphorylated in bovine cardiac troponin T and I. Characterization by 31P-NMR spectroscopy and phosphorylation by protein kinases.
Eur J Biochem. 1990 Jul 5;190(3):575-82
Authors: Swiderek K, Jaquet K, Meyer HE, Schächtele C, Hofmann F, Heilmeyer LM
...
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[NMR paper] NMR analysis of cardiac troponin C-troponin I complexes: effects of phosphorylation.
NMR analysis of cardiac troponin C-troponin I complexes: effects of phosphorylation.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles NMR analysis of cardiac troponin C-troponin I complexes: effects of phosphorylation.
FEBS Lett. 1999 Jun 18;453(1-2):107-12
Authors: Finley N, Abbott MB, Abusamhadneh E, Gaponenko V, Dong W, Gasmi-Seabrook G, Howarth JW, Rance M, Solaro RJ, Cheung HC, Rosevear PR
Phosphorylation of the cardiac specific amino-terminus of troponin I has...