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• W1991444138 abstract "The cdc25 phosphatase is a mitotic inducer that activates p34cdc2 at the G2/M transition by dephosphorylation of Tyr15 in p34cdc2. cdc25 itself is also regulated through periodic changes in its phosphorylation state. To elucidate the mechanism for induction of mitosis, phosphorylation of cdc25 has been investigated using recombinant proteins. cdc25 is phosphorylated by both cyclin A/p34cdc2 and cyclin B/p34cdc2 at similar sets of multiple sites in vitro. This phosphorylation retards its electrophoretical mobility and activates its ability to increase cyclin B/p34cdc2 kinase activity three- to fourfold in vitro, as found for endogenous Xenopus cdc25 in M-phase extracts. The threonine and serine residues followed by proline that are conserved between Xenopus and human cdc25 have been mutated. Both the triple mutation of Thr48, Thr67, and Thr138 and the quintuple mutation of these three threonine residues plus Ser205 and Ser285, almost completely abolish the shift in electrophoretic mobility of cdc25 after incubation with M-phase extracts or phosphorylation by p34cdc2. These mutations inhibit the activation of cdc25 by phosphorylation with p34cdc2 by 70 and 90%, respectively. At physiological concentrations these mutants cannot activate cyclin B/p34cdc2 in cdc25-immunodepleted oocyte extracts, suggesting that a positive feed-back loop between cdc2 and cdc25 is necessary for the full activation of cyclin B/p34cdc2 that induces abrupt entry into mitosis in vivo." @default.
• W1991444138 created "2016-06-24" @default.
• W1991444138 creator A5020952915 @default.
• W1991444138 creator A5089136154 @default.
• W1991444138 date "1993-12-01" @default.
• W1991444138 modified "2023-09-25" @default.
• W1991444138 title "Elimination of cdc2 phosphorylation sites in the cdc25 phosphatase blocks initiation of M-phase." @default.
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• W1991444138 doi "https://doi.org/10.1091/mbc.4.12.1337" @default.
• W1991444138 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/275769" @default.
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