Abstract
The normal heartbeat is conditioned by transient increases in the intracellular free Ca2+ concentration. Ca2+ influx in cardiomyocytes is regulated by the activity of the heteromeric L-type voltage-activated CaV1.2 channel. A complex network of interactions between the different proteins forming the ion channel supports the kinetics and the activation gating of the Ca2+ influx. Alterations in the biophysical and biochemical properties or in the biogenesis in any of these proteins can lead to serious disturbances in the cardiac rhythm. The multi-subunit nature of the channel complex is better comprehended by examining the high-resolution three-dimensional structure of the closely related CaV1.1 channel. The architectural map identifies precise interaction loci between the different subunits and paves the way for elucidating the mechanistic basis for the regulation of Ca2+ balance in cardiac myocytes under physiological and pathological conditions.
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Abbreviations
- 3-D:
-
Three dimensional
- BrS:
-
Brugada syndrome
- CaM:
-
Calmodulin
- Cryo-EM:
-
Cryo-electron microscopy
- LQT8:
-
Long QT syndrome 8
- NavAb:
-
Voltage-gated Na+ channel from Arcobacter butzleri
- QT:
-
Time interval between the Q and the T waves on the cardiac electrocardiogram
- SQTS:
-
Short QT syndrome
- VWA:
-
Von Willebrand factor A
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Acknowledgments
This work was supported by a grant from the Natural Sciences and Engineering Research Council of Canada to LP
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Briot, J., Tétreault, MP., Bourdin, B., Parent, L. (2017). Inherited Ventricular Arrhythmias: The Role of the Multi-Subunit Structure of the L-Type Calcium Channel Complex. In: Atassi, M. (eds) Protein Reviews. Advances in Experimental Medicine and Biology(), vol 966. Springer, Singapore. https://doi.org/10.1007/5584_2016_186
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