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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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Loss of muscle-specific RING-finger 3 predisposes the heart to cardiac rupture after myocardial infarction.

RING-finger proteins commonly function as ubiquitin ligases that mediate protein degradation by the ubiquitin-proteasome pathway. Muscle-specific RING-finger (MuRF) proteins are striated muscle-restricted components of the sarcomere that are thought to possess ubiquitin ligase activity. We show that mice lacking MuRF3 display normal cardiac function but are prone to cardiac rupture after acute myocardial infarction. Cardiac rupture is preceded by left ventricular dilation and a severe decrease in cardiac contractility accompanied by myocyte degeneration. Yeast two-hybrid assays revealed four-and-a-half LIM domain (FHL2) and gamma-filamin proteins as MuRF3 interaction partners, and biochemical analyses showed these proteins to be targets for degradation by MuRF3. Accordingly, FHL2 and gamma-filamin accumulated to abnormal levels in the hearts of mice lacking MuRF3. These findings reveal an important role of MuRF3 in maintaining cardiac integrity and function after acute myocardial infarction and suggest that turnover of FHL2 and gamma-filamin contributes to this cardioprotective function of MuRF3.[1]

References

  1. Loss of muscle-specific RING-finger 3 predisposes the heart to cardiac rupture after myocardial infarction. Fielitz, J., van Rooij, E., Spencer, J.A., Shelton, J.M., Latif, S., van der Nagel, R., Bezprozvannaya, S., de Windt, L., Richardson, J.A., Bassel-Duby, R., Olson, E.N. Proc. Natl. Acad. Sci. U.S.A. (2007) [Pubmed]
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