Abstract
Mutations of cardiac myosin binding protein-C (cMyBP-C) are inherited by an estimated 60 million people worldwide, and the protein is the target of several kinases. Recent evidence further suggests that cMyBP-C mutations alter Ca2+ transients, leading to electrophysiological dysfunction. Thus, while the importance of studying this cardiac sarcomere protein is clear, preliminary data in the literature have raised many questions. Therefore, in this article, we propose to review the structure and function of cMyBP-C with particular respect to the role(s) in cardiac contractility and whether its release into the circulatory system is a potential biomarker of myocardial infarction. We also discuss future directions and experimental designs that may lead to expanding the role(s) of cMyBP-C in the heart. In conclusion, we suggest that cMyBP-C is a regulatory protein that could offer a broad clinical utility in maintaining normal cardiac function.
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Abbreviations
- α-TM:
-
α-tropomyosin
- cTnI:
-
Cardiac troponin I
- cTnT:
-
Cardiac troponin T
- cMyBP-C:
-
Cardiac myosin binding protein-C
- DCM:
-
Dilated cardiomyopathy
- HCM:
-
Hypertrophic cardiomyopathy
- HF:
-
Heart failure
- kDa:
-
Kilo Dalton
- LV:
-
Left ventricular
- MI:
-
Myocardial infarction
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Acknowledgments
This study was funded by National Institutes of Health grants R01HL105826 (Dr. Sadayappan) and HL101297, HL62426, and HL75494 (Dr. de Tombe) and American Heart Association - Scientist Development Grant (0830311 N to Dr. Sadayappan).
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Sadayappan, S., de Tombe, P.P. Cardiac myosin binding protein-C: redefining its structure and function. Biophys Rev 4, 93–106 (2012). https://doi.org/10.1007/s12551-012-0067-x
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DOI: https://doi.org/10.1007/s12551-012-0067-x