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- W2002174889 abstract "A 62 kDa Zn(2+)-dependent acid phosphatase has been purified from bovine brain. The protein was carboxymethylated and then cleaved by endoproteinase Glu-C, trypsin and CNBr. Several fragments were subjected to structural analysis either by using mass spectrometry or automated peptide sequencing. The four sequenced peptides were compared with the known protein sequences contained in the EMBL Data Bank. All four peptide sequences were identical to the corresponding amino-acid sequences present in myo-inositol 1-phosphatase from bovine brain. Furthermore we found that the amino-acid composition of Zn(2+)-dependent acid phosphatase purified in our laboratory is very similar to that of myo-inositol 1-phosphatase, and that several peptide fragments have molecular weights (measured by mass spectrometry techniques) identical to those expected for cleavage-fragments originated from the authentic myo-inositol 1-phosphatase. This is one of the key enzymes in the receptor-stimulated inositol phospholipid metabolism and it has been considered as the probable target of Li+ ion during LiCl therapy in manic-depressive patients. The comparison of the Zn(2+)-dependent acid phosphatase and the Mg(2+)-dependent myo-inositol-1-phosphatase activities, measured at different purification steps, shows that the ratio between the two activities was remarkably constant during enzyme purification. We also demonstrated that in the presence of Mg2+ this enzyme efficiently catalyses the hydrolysis of myo-inositol 1-phosphate, and that the Li+ ion inhibits this activity. Furthermore, the thermal treatment of the enzyme causes a time-dependent parallel decrease of both Zn-dependent p-nitrophenyl phosphatase (assayed at pH 5.5) and Mg(2+)-dependent myo-inositol-1-phosphatase (assayed at pH 8.0) activities, suggesting the hypothesis that the same protein possesses both these activities." @default.
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- W2002174889 date "1996-08-13" @default.
- W2002174889 modified "2023-10-14" @default.
- W2002174889 title "Identity of zinc ion-dependent acid phosphatase from bovine brain and myo-inositol 1-phosphatase" @default.
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- W2002174889 doi "https://doi.org/10.1016/0304-4165(96)00022-0" @default.
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