Calmodulin mutations causing catecholaminergic polymorphic ventricular tachycardia confer opposing functional and biophysical molecular changes

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Calmodulin mutations causing catecholaminergic polymorphic ventricular tachycardia confer opposing functional and biophysical molecular changes. / Søndergaard, Mads T; Sorensen, Anders B; Skov, Louise L; Kjaer-Sorensen, Kasper; Bauer, Mikael C; Nyegaard, Mette; Linse, Sara; Oxvig, Claus; Overgaard, Michael Toft.

In: F E B S Journal, Vol. 282, No. 4, 02.2015, p. 803-816.

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Søndergaard, Mads T ; Sorensen, Anders B ; Skov, Louise L ; Kjaer-Sorensen, Kasper ; Bauer, Mikael C ; Nyegaard, Mette ; Linse, Sara ; Oxvig, Claus ; Overgaard, Michael Toft. / Calmodulin mutations causing catecholaminergic polymorphic ventricular tachycardia confer opposing functional and biophysical molecular changes. In: F E B S Journal. 2015 ; Vol. 282, No. 4. pp. 803-816.

Bibtex

@article{9df2db2a3cec4fff824f6cdadff82d53,
title = "Calmodulin mutations causing catecholaminergic polymorphic ventricular tachycardia confer opposing functional and biophysical molecular changes",
abstract = "Calmodulin (CaM)(1) is the central mediator of intracellular Ca(2+) signalling in cardiomyocytes, where it conveys the intricate Ca(2+) transients to the proteins controlling cardiac contraction. We recently linked two separate mutations in CaM (N53I and N97S) to dominantly inherited catecholaminergic polymorphic ventricular tachycardia (CPVT), an arrhythmic disorder in which exercise or acute emotion can lead to syncope and sudden cardiac death. Given the ubiquitous presence of CaM in all eukaryote cells, it is particular intriguing that carriers of either mutation show no additional symptoms. Here, we investigated the effects of the CaM CPVT mutations in a zebrafish animal model. Three-days old embryos injected with either CaM mRNA showed no detectable pathologies or developmental abnormalities. However, embryos injected with CPVT CaM mRNA displayed increased heart rate compared to WT CaM mRNA under β-adrenergic stimulation, demonstrating a conserved dominant cardiac specific effect between zebrafish and human carriers of these mutations. Motivated by the highly similar physiological phenotypes, we compared the effects of the N53I and N97S mutations on the biophysical and functional properties of CaM. Surprisingly, the mutations have opposing effects on CaM C-lobe Ca(2+) binding affinity and kinetics, and changes to the CaM N-lobe Ca(2+) binding are minor and specific to the N53I mutation. Furthermore, both mutations induce differential perturbations to structure and stability towards unfolding. Our results suggest different molecular disease mechanisms for the CPVT (N53I and N97S mutations), and strongly support that cardiac contraction is the physiological process most sensitive to CaM integrity. This article is protected by copyright. All rights reserved.",
author = "S{\o}ndergaard, {Mads T} and Sorensen, {Anders B} and Skov, {Louise L} and Kasper Kjaer-Sorensen and Bauer, {Mikael C} and Mette Nyegaard and Sara Linse and Claus Oxvig and Overgaard, {Michael Toft}",
note = "This article is protected by copyright. All rights reserved.",
year = "2015",
month = feb,
doi = "10.1111/febs.13184",
language = "English",
volume = "282",
pages = "803--816",
journal = "F E B S Journal",
issn = "1742-464X",
publisher = "Wiley-Blackwell Publishing Ltd.",
number = "4",

}

RIS

TY - JOUR

T1 - Calmodulin mutations causing catecholaminergic polymorphic ventricular tachycardia confer opposing functional and biophysical molecular changes

AU - Søndergaard, Mads T

AU - Sorensen, Anders B

AU - Skov, Louise L

AU - Kjaer-Sorensen, Kasper

AU - Bauer, Mikael C

AU - Nyegaard, Mette

AU - Linse, Sara

AU - Oxvig, Claus

AU - Overgaard, Michael Toft

N1 - This article is protected by copyright. All rights reserved.

PY - 2015/2

Y1 - 2015/2

N2 - Calmodulin (CaM)(1) is the central mediator of intracellular Ca(2+) signalling in cardiomyocytes, where it conveys the intricate Ca(2+) transients to the proteins controlling cardiac contraction. We recently linked two separate mutations in CaM (N53I and N97S) to dominantly inherited catecholaminergic polymorphic ventricular tachycardia (CPVT), an arrhythmic disorder in which exercise or acute emotion can lead to syncope and sudden cardiac death. Given the ubiquitous presence of CaM in all eukaryote cells, it is particular intriguing that carriers of either mutation show no additional symptoms. Here, we investigated the effects of the CaM CPVT mutations in a zebrafish animal model. Three-days old embryos injected with either CaM mRNA showed no detectable pathologies or developmental abnormalities. However, embryos injected with CPVT CaM mRNA displayed increased heart rate compared to WT CaM mRNA under β-adrenergic stimulation, demonstrating a conserved dominant cardiac specific effect between zebrafish and human carriers of these mutations. Motivated by the highly similar physiological phenotypes, we compared the effects of the N53I and N97S mutations on the biophysical and functional properties of CaM. Surprisingly, the mutations have opposing effects on CaM C-lobe Ca(2+) binding affinity and kinetics, and changes to the CaM N-lobe Ca(2+) binding are minor and specific to the N53I mutation. Furthermore, both mutations induce differential perturbations to structure and stability towards unfolding. Our results suggest different molecular disease mechanisms for the CPVT (N53I and N97S mutations), and strongly support that cardiac contraction is the physiological process most sensitive to CaM integrity. This article is protected by copyright. All rights reserved.

AB - Calmodulin (CaM)(1) is the central mediator of intracellular Ca(2+) signalling in cardiomyocytes, where it conveys the intricate Ca(2+) transients to the proteins controlling cardiac contraction. We recently linked two separate mutations in CaM (N53I and N97S) to dominantly inherited catecholaminergic polymorphic ventricular tachycardia (CPVT), an arrhythmic disorder in which exercise or acute emotion can lead to syncope and sudden cardiac death. Given the ubiquitous presence of CaM in all eukaryote cells, it is particular intriguing that carriers of either mutation show no additional symptoms. Here, we investigated the effects of the CaM CPVT mutations in a zebrafish animal model. Three-days old embryos injected with either CaM mRNA showed no detectable pathologies or developmental abnormalities. However, embryos injected with CPVT CaM mRNA displayed increased heart rate compared to WT CaM mRNA under β-adrenergic stimulation, demonstrating a conserved dominant cardiac specific effect between zebrafish and human carriers of these mutations. Motivated by the highly similar physiological phenotypes, we compared the effects of the N53I and N97S mutations on the biophysical and functional properties of CaM. Surprisingly, the mutations have opposing effects on CaM C-lobe Ca(2+) binding affinity and kinetics, and changes to the CaM N-lobe Ca(2+) binding are minor and specific to the N53I mutation. Furthermore, both mutations induce differential perturbations to structure and stability towards unfolding. Our results suggest different molecular disease mechanisms for the CPVT (N53I and N97S mutations), and strongly support that cardiac contraction is the physiological process most sensitive to CaM integrity. This article is protected by copyright. All rights reserved.

U2 - 10.1111/febs.13184

DO - 10.1111/febs.13184

M3 - Journal article

C2 - 25557436

VL - 282

SP - 803

EP - 816

JO - F E B S Journal

JF - F E B S Journal

SN - 1742-464X

IS - 4

ER -