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- W1567120519 abstract "Calpastatin is an endogenous inhibitor protein acting specifically on calpain (EC 3.4.22.17; Ca2(+)-dependent cysteine proteinase). The phosphorylation of calpastatin was investigated in human hematopoietic system cell lines. Microheterogeneity of calpastatin was observed, in which 118- and 116-kDa forms were named calpastatin a and b, respectively. The phosphorylation of both calpastatins was identified in all cell lines examined and occurred mainly at serine residues with trace amounts of phosphothreonine in vivo. The incubation of cells with 12-O-tetradecanoylphorbol-13-acetate increased the incorporation of 32P-orthophosphate into calpastatin a. Two-dimensional maps of 32P-labeled phosphopeptide from both calpastatins were identical except for additional minor spots for calpastatin a. [35S]methionine-labeled calpastatins a and b were localized mainly in the cytosol, and only 6% of cellular calpastatins were detected in the membrane fraction. By contrast, more than 30% of the 32P-labeled calpastatins a and b were distributed in the membrane fraction. Thus, the phosphorylation of calpastatin may be involved in regulating the calpain-calpastatin protein kinase system by its subcellular distribution." @default.
- W1567120519 created "2016-06-24" @default.
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- W1567120519 date "1991-02-01" @default.
- W1567120519 modified "2023-09-26" @default.
- W1567120519 title "Phosphorylation and subcellular distribution of calpastatin in human hematopoietic system cells" @default.
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- W1567120519 doi "https://doi.org/10.1016/s0021-9258(19)67888-9" @default.
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