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- W2016295220 abstract "p34, a specific p-nitrophenyl phosphatase (pNPPase) was identified and purified from the murine cell line EL4 in a screen for the intracellular molecular targets of the antiinflammatory natural product parthenolide. A BLAST search analysis revealed that it has a high degree of sequence similarity to two yeast alkaline phosphatases. We have cloned, sequenced, and expressed p34 as a GST-tagged fusion protein in Escherichia coli and an EE-epitope-tagged fusion protein in mammalian cells. Using p-nitrophenyl phosphate (pNPP) as a substrate, p34 is optimally active at pH 7.6 with a K(m) of 1.36 mM and K(cat) of 0.052 min(-1). Addition of 1 mM Mg(2+) to the reaction mixture increases its activity by 14-fold. Other divalent metal ions such as Co(2+) and Mn(2+) also stimulated the activity of the enzyme, while Zn(2+), Fe(2+), and Cu(2+) had no effect. Furthermore, both NaCl and KCl enhanced the activity of the enzyme, having maximal effect at 50 and 75 mM, respectively. The enzyme is inhibited by sodium orthovanadate but not by sodium fluoride or okadaic acid. Mutational analysis data suggest that p34 belongs to the group of phosphatases characterized by the sequence motif DXDX(T/V)." @default.
- W2016295220 created "2016-06-24" @default.
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- W2016295220 date "2002-05-23" @default.
- W2016295220 modified "2023-09-27" @default.
- W2016295220 title "Characterization of a Novel Mammalian Phosphatase Having Sequence Similarity to <i>Schizosaccharomyces pombe</i> PHO2 and <i>Saccharomyces cerevisiae </i>PHO13" @default.
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- W2016295220 doi "https://doi.org/10.1021/bi0255064" @default.
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