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• W2019849367 abstract "The retinoblastoma gene product (pRb) is dephosphorylated at the exit from mitosis and protein phosphatase-1 (PP1) seems to be responsible for such dephosphorylation. Three isoforms of PP1 exist in mammalian cells, alpha, gamma1 and delta, with differential subcellular localization and potentially different targeting subunits and functions. In order to identify which isoform dephosphorylates pRb, we used isoform-specific antibodies and analyzed the association of the PP1 isoforms with pRb in nocodazole-blocked (mitotic) HeLa cells and in cells released from the mitotic block (early G1). PP1delta was found associated with the pRb immunoprecipitated from a mitotic cell extract, whereas neither PP1gamma1 nor PP1alpha were detected. In G1 cells progressively less pRb and of lower Mr was detected in anti-PP1delta immunocomplexes, and pRb had almost disappeared by 8 h. The PP1 associated with pRb was inactive at mitosis, but underwent a quick activation as cells exited from mitosis, with a peak at 1 h. Then the activity decreased progressively and disappeared by 8 h. [32P]labeled pRb, obtained from G2 cells, was dephosphorylated in vitro by PP1delta obtained from early G1 cells. Altogether, the results indicated that PP1delta associated with pRb and may be responsible for the phosphatase activity detected in the pRb complexes, supporting the hypothesis that PP1delta may be the isoform that dephosphorylates pRb." @default.
• W2019849367 created "2016-06-24" @default.
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• W2019849367 date "1997-06-01" @default.
• W2019849367 modified "2023-10-16" @default.
• W2019849367 title "Association of Protein Phosphatase-1δ with the Retinoblastoma Protein and Reversible Phosphatase Activation in Mitotic HeLa Cells and in Cells Released from Mitosis" @default.
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• W2019849367 doi "https://doi.org/10.1006/bbrc.1997.6886" @default.
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