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The present study was conducted to clarify the relationship between calpain (EC 3. 4.22. 17) and muscle protein degradation system using Japanese quail. The fractional rates of muscle protein degradation (Kd) were determined by the Nz-methylhistidine methods, and both of calpain and calpastatin were separated by DEAE-Sephacel and Phenyl-Sepharose column chromatography, and measured their activities with alkali denatured casein as a substrate. The correlation coefficients between the Kd and the calpain or calpastatin activities were 0.728 and -0.453, respectively. Multiple regression equation of muscle protein degradation rate (Y) to calpain activity (X1) and calpastatin activity (X2) was calculated as Y=5.892+14.033X1-88.128X2 (R2=0.706). The standardized partial regression coefficients of calpain and calpastatin to Kd were 0.605 and -0.453, respectively. These values suggest that 1) activities of calpain and calpastatin affect the muscle protein degradation rate, and 2) individual information on calpain or calpastatin activities in muscle may be available as a selection characteristic for the protein turnover and growth. (Jpn. Poult. Sci., 34: 231-239, 1997)

Correlation between Skeletal Muscle Calpain Activity and Fractional Rate of Muscle Degradation of Japanese Quail Coturnix coturnix japonica.