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XB-ART-15237
Mol Biol Cell 1998 Feb 01;92:345-54. doi: 10.1091/mbc.9.2.345.
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14-3-3 proteins act as negative regulators of the mitotic inducer Cdc25 in Xenopus egg extracts.

Kumagai A , Yakowec PS , Dunphy WG .


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Cdc25, the dual-specificity phosphatase that dephosphorylates the Cdc2-cyclin B complex at mitosis, is highly regulated during the cell cycle. In Xenopus egg extracts, Cdc25 is associated with two isoforms of the 14-3-3 protein. Cdc25 is complexed primarily with 14-3-3epsilon and to a lesser extent with 14-3-3zeta. The association of these 14-3-3 proteins with Cdc25 varies dramatically during the cell cycle: binding is high during interphase but virtually absent at mitosis. Interaction with 14-3-3 is mediated by phosphorylation of Xenopus Cdc25 at Ser-287, which resides in a consensus 14-3-3 binding site. Recombinant Cdc25 with a point mutation at this residue (Cdc25-S287A) is incapable of binding to 14-3-3. Addition of the Cdc25-S287A mutant to Xenopus egg extracts accelerates mitosis and overrides checkpoint-mediated arrests of mitotic entry due to the presence of unreplicated and damaged DNA. These findings indicate that 14-3-3 proteins act as negative regulators of Cdc25 in controlling the G2-M transition.

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Species referenced: Xenopus
Genes referenced: cdc25c cdk1 rasgrf1

References [+] :
Aitken, 14-3-3 and its possible role in co-ordinating multiple signalling pathways. 1996, Pubmed