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Calcium and peptide binding to folded and unfolded conformations of cardiac Troponin C. Electrospray ionization and Fourier transform ion cyclotron resonance mass spectrometry

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UNSPECIFIED (2002) Calcium and peptide binding to folded and unfolded conformations of cardiac Troponin C. Electrospray ionization and Fourier transform ion cyclotron resonance mass spectrometry. EUROPEAN JOURNAL OF MASS SPECTROMETRY, 8 (6). pp. 471-481. doi:10.1255/ejms.523 ISSN 1469-0667.

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Official URL: http://dx.doi.org/10.1255/ejms.523

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Abstract

The binding of Ca2+ and of a peptide (N-TnI) to human cardiac troponin C (TnC) and its isolated N- and C-terminal domains has been characterized by electrospray ionization Fourier transform ion cyclotron resonance (ESI FT-ICR) mass spectrometry. The peptide N-TnI corresponds to residues 1-29 of the cardiac-specific N-terminal extension of human cardiac troponin I (TnI). The binding of Ca2+ to intact TnC in the absence of the peptide was found to take a bimodal form with preferred stoichiometries of 1 : 1 TnC : Ca2+ and 1 : 3 TnC : Ca2+. It is concluded that TnC existed in two conformational isomers that had different binding affinities for Ca2+: the binding of 3 Ca2+ was characteristic of a folded conformation (TnC(A)) and the binding of 1 Ca2+ was characteristic of a partially unfolded conformation (TnC(B)). Both of these conformations contributed to the 8+ (and other) charge states of TnC, and were distinguished on the basis of their different Ca2+-binding affinities and not on the basis of the charge state. In the presence of the peptide, a complex with 1 : 1 : 1 TnC : peptide : Ca2+ stoichiometry was formed.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Journal or Publication Title: EUROPEAN JOURNAL OF MASS SPECTROMETRY
Publisher: IM PUBLICATIONS
ISSN: 1469-0667
Official Date: 2002
Dates:
DateEvent
2002UNSPECIFIED
Volume: 8
Number: 6
Number of Pages: 11
Page Range: pp. 471-481
DOI: 10.1255/ejms.523
Publication Status: Published

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