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• W2017317529 abstract "In this work, we describe how living cells of Trypanosoma brucei procyclic forms were able to hydrolyze extracellular p-nitrophenylphosphate (pNPP). These intact parasites, which had their viability determined by motility and the Trypan blue method, presented a low level of pNPP hydrolysis in the absence of any divalent metal (0.72+/-0.07 nmol pNP/mg min). Interestingly, in the presence of 5mM MgCl(2), ectophosphatase activity of 1.91+/-0.21 nmol pNP/mg min was observed. The ectophosphatase activity was also stimulated by MnCl(2), CoCl(2) and CuCl(2) but not by CaCl(2) and CdCl(2) and was inhibited by ZnCl(2). The addition of Mg(2+), Mn(2+), Co(2+) and Cu(2+) to extracellular medium increased the ectophosphatase activity in a dose-dependent manner. At 5mM pNPP, half-maximal stimulation of pNPP hydrolysis was obtained with 0.39+/-0.05 mM MgCl(2), 0.33+/-0.03 mM MnCl(2), 1.63+/-0.12 mM CoCl(2) and 2.04+/-0.33 mM CuCl(2). In the absence of any divalent metal (basal activity) the apparent K(m) for pNPP was 0.66+/-0.09 mM, while at saturating MgCl(2) concentrations the corresponding apparent K(m) for pNPP for Mg(2+)-stimulated phosphatase activity (difference between total minus basal phosphatase activity) was 0.27+/-0.03 mM. The Mg(2+)-stimulated pNPP hydrolysis was strongly inhibited by ZnCl(2) and vanadate, while the metal-independent basal phosphatase activity was less inhibited by these phosphotyrosyl phosphatase inhibitors." @default.
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• W2017317529 date "2003-12-01" @default.
• W2017317529 modified "2023-10-18" @default.
• W2017317529 title "A metallo phosphatase activity present on the surface of Trypanosoma brucei procyclic forms" @default.
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• W2017317529 doi "https://doi.org/10.1016/j.vetpar.2003.09.012" @default.
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