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• W1497274503 abstract "This report describes the purification of the major protein-tyrosine-phosphatases from human placenta. Enzyme activity was followed with a novel artificial substrate, namely reduced, carboxamidomethylated, and maleylated lysozyme, phosphorylated on tyrosine by a partially purified preparation of insulin and epidermal growth factor receptor kinases, also from human placenta. The key step in the purification of the protein-tyrosine-phosphatases was affinity chromatography on a column of thiophosphorylated, reduced, carboxamidomethylated, and maleylated lysozyme-Sepharose. Purification was carried out separately from both the and fractions. Whereas multiple and distinct enzyme forms were obtained from each of these, little difference could be detected between the behavior of the soluble enzyme subtypes and their particulate counterparts. The major subtypes were purified to apparent homogeneity with an approximately 23,000-fold enrichment and 10% yield from the fraction and a 4,300-fold enrichment and 13% yield from the fraction. Both samples migrated as bands of 35 kDa on sodium dodecyl sulfate-polyacrylamide gel electrophoresis and had specific activities of approximately 45,000 nmol of Pi released min-1 mg-1, at least 2-3-fold higher than that of the type 1 and 2A serine/threonine phosphatases. The level of protein-tyrosine-phosphatases in the fraction of human placenta (2,000 units/g of protein) was approximately the same as protein-serine/threonine-phosphatases 1 and 2A in skeletal muscle." @default.
• W1497274503 created "2016-06-24" @default.
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• W1497274503 date "1988-05-01" @default.
• W1497274503 modified "2023-10-06" @default.
• W1497274503 title "Purification of the major protein-tyrosine-phosphatases of human placenta." @default.
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• W1497274503 doi "https://doi.org/10.1016/s0021-9258(18)68702-2" @default.
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