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- W1773508713 abstract "Lysophosphatidic acid (LPA)-specific phosphatase was purified 3300-fold from bovine brain cytosol. The purification was achieved by (NH4)2SO4 fractionation and several chromatography steps, such as Q-Sepharose, DEAE-5PW, Superdex 200 and heparin-Sepharose. The final enzyme preparation showed a single band of molecular mass 44 kDa on SDS/PAGE under reducing conditions. The enzyme activity was completely dependent on the presence of detergents such as Triton X-100, CHAPS, cholate and octyl-beta-glucoside. The activity was independent of Mg2+; other cations were inhibitory. The enzyme hydrolysed LPA specifically but not cardiolipin, tetraoleoyl-bisphosphatidic acid, ceramide 1-phosphate or sphingosine 1-phosphate, although phosphatidic acid was hydrolysed slightly. The purified enzyme hydrolysed 1-oleoyl LPA at a rate of 1. 1 micromol/min per mg of protein when assayed with LPA as Triton X-100 mixed micelles. The Km value for LPA was 38 microM. NaF and N-ethylmaleimide markedly inhibited the activity, but propranolol had a less potent inhibitory effect. The LPA-specific phosphatase might have an important role in LPA elimination." @default.
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- W1773508713 date "1998-12-01" @default.
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- W1773508713 title "Purification and characterization of a lysophosphatidic acid-specific phosphatase" @default.
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- W1773508713 doi "https://doi.org/10.1042/bj3360483" @default.
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