Degradation of protein kinase Malpha by mu-calpain in a mu-calpain-protein kinase Calpha complex |
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Authors: | Verret C Poussard S Touyarot K Donger C Savart M Cottin P Ducastaing A |
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Affiliation: | ISTAB, Laboratoire de Biochimie et Technologie des Aliments, Université Bordeaux I and UA-INRA 429, Avenue des Facultés, 33405, Talence Cedex, France. |
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Abstract: | In previous studies, we isolated and identified a mu-calpain-PKCalpha complex from rabbit skeletal muscle. At the same time we pointed out that an association between mu-calpain and PKCalpha could occur at the level of the plasma membrane of muscle cells, and that PKCalpha could thus be considered as a potential mu-calpain substrate. In the present study, using the mu-calpain-PKCalpha complex as a model, we report that mu-calpain is activated in the combined presence of physiological calcium concentrations (less than 1 microM) and phosphatidylserine. Furthermore our data also show that: (1) there exists a correlation between the appearance of autolyzed mu-calpain forms and PKCalpha hydrolysis which leads to the formation of PKMalpha; (2) in certain experimental conditions, autolyzed mu-calpain forms are able to hydrolyze PKMalpha independently of the presence of diacylglycerol. |
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