Effect of calcium-binding protein regucalcin on hepatic protein synthesis: Inhibition of aminoacyl-tRNA synthetase activity |
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Authors: | Masayoshi Yamaguchi Seiichi Mori |
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Institution: | (1) Department of Environmental Biochemistry, School of Pharmaceutical Sciences, University of Shizuoka, 395 Yada, 422 Shizuoka-City, Japan |
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Abstract: | The effect of regucalcin, a calcium-binding protein isolated from rat liver cytosol, onin vitro protein synthesis in the 5500g supernatant fraction of rat liver homogenate was investigated. Addition of Ca2+ up to 5.0 M in the reaction mixture caused a significant decrease in protein synthesis. This decrease was saturated at 10 M Ca2+. The Ca2+ effect was not reversed by the presence of regucalcin (2.0 M); the protein caused a remarkable decrease in hepatic protein synthesis, and it enhanced significantly the Ca2– effect. Meanwhile, calmodulin (2.5-20 g/ml), a calcium-binding protein, did not have an appreciable effect on the Ca2+ (10 M)-induced decrease in hepatic protein synthesis. 3H]Leucyl-tRNA synthetase activity in the 105000g supernatant fraction (cytosol) of liver homogenate was markedly decreased by addition of Ca2+ (1.0–50 M). This decrease was not reversed by the presence of regucalcin (2.0 M); the protein (1.0–2.0 M) caused a remarkable decrease in the enzyme activity. The present results suggest that regucalcin can regulate protein synthesis in liver cells. |
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Keywords: | calcium regucalcin protein synthesis aminoacyl-tRNA synthetase rat liver |
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