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- W1569146512 abstract "Methylotrophic yeast Pichia pastoris was used for a medium-scale expression of structural (PR65/A) and catalytic (PP2Ac) subunits of human type 2A protein phosphatase (PP2A). Constructs encoding these subunits, which were designed to introduce eight histidines at their N-termini, were introduced into the KM71 Pichia strain by homologous recombination. Recombinant proteins overproduced after methanol induction were purified from cell-free extracts by anion-exchange chromatography on DEAE-Sepharose, and Ni2+/nitrilotriacetate/agarose. In addition, chromatography on omega-aminohexyl-Sepharose was applied to purify recombinant (r)PR65/A. This purification scheme yielded approximately 5 mg and 100 microg of rPR65/A and rPP2Ac, respectively, from 1 L of the yeast culture. The specific activity of rPP2Ac measured with [32P]phosphorylase a [1.7 micromol.min-1.(mg protein)-1] and its inhibition by okadaic acid (IC50 = 0.66 nM) were similar to PP2A isolated from rabbit skeletal muscle. As demonstrated by immunodetection with methylation state-specific antibodies, recombinant PP2Ac was carboxymethylated at the last C-terminal leucine residue. Recombinant PP2A subunits were able to form a complex as demonstrated both by activity assays in the presence of protamine and by chromatography on protamine-agarose. In summary, P. pastoris provides a convenient heterologous system for the production of recombinant subunits of PP2A." @default.
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- W1569146512 date "2000-08-01" @default.
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- W1569146512 title "Biochemical characterization of recombinant subunits of type 2A protein phosphatase overexpressed in Pichia pastoris" @default.
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- W1569146512 doi "https://doi.org/10.1046/j.1432-1327.2000.01591.x" @default.
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