期刊
CIRCULATION RESEARCH
卷 104, 期 5, 页码 650-U175出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCRESAHA.108.186676
关键词
zebrafish; genetics; essential cardiac myosin light chain-1; phosphorylation; myocardial contractility
资金
- Deutsche Forschungsgemeinschaft [Ro2173/1-1, Ro2173/2-1, Ro2173/2-2, Ro2173/3-1]
- Bundesministerium fur Bildung und Forschung [01GS0108, 01GS0420, 01GS0836]
- Klaus-Georg and Sigrid Hengstberger Stipendium
Although it is well known that mutations in the cardiac essential myosin light chain-1 (cmlc-1) gene can cause hypertrophic cardiomyopathy, the precise in vivo structural and functional roles of cMLC-1 in the heart are only poorly understood. We have isolated the zebrafish mutant lazy susan (laz), which displays severely reduced contractility of both heart chambers. By positional cloning, we identified a nonsense mutation within the zebrafish cmlc-1 gene to be responsible for the laz phenotype, leading to expression of a carboxyl-terminally truncated cMLC-1. Whereas complete loss of cMLC-1 leads to cardiac acontractility attributable to impaired cardiac sarcomerogenesis, expression of a carboxyl-terminally truncated cMLC-1 in laz mutant hearts is sufficient for normal cardiac sarcomerogenesis but severely impairs cardiac contractility in a cell-autonomous fashion. Whereas overexpression of wild-type cMLC-1 restores contractility of laz mutant cardiomyocytes, overexpression of phosphorylation site serine 195-deficient cMLC-1 (cMLC-1S195A) does not reconstitute cardiac contractility in laz mutant cardiomyocytes. By contrast, introduction of a phosphomimetic amino acid on position 195 (cMLC-1(S195D)) rescues cardiomyocyte contractility, demonstrating for the first time an essential role of the carboxyl terminus and especially of serine 195 of cMLC-1 in the regulation of cardiac contractility. (Circ Res. 2009; 104: 650-659.)
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