Inhibitor-2 induced M-phase arrest in Xenopus cycling egg extracts is dependent on MAPK activation

• Autorzy: Khandani A. , Mohtashami M. , Camirand A.
• Języki publikacji: EN

Abstrakty

EN

The evolutionarily-conserved protein phosphatase 1 (PP1) plays a central role in dephosphorylation of phosphoproteins during the M phase of the cell cycle. We demonstrate here that the PP1 inhibitor inhibitor-2 protein (Inh-2) induces an M-phase arrest in Xenopus cycling egg extracts. Interestingly, the characteristics of this M-phase arrest are similar to those of mitogen-activated protein kinase (p42MAPK)-induced M-phase arrest. This prompted us to investigate whether Inh-2-induced M-phase arrest was dependent on activation of the p42MAPK pathway. We demonstrate here that MAPK activity is required for Inh-2-induced M-phase arrest, as inhibition of MAPK by PD98059 allowed cycling extracts to exit M phase, despite the presence of Inh-2. We next investigated whether Inh-2 phosphorylation by the MAPK pathway was required to induce an M-phase arrest. We discovered that while p90Rsk (a MAPK protein required for M-phase arrest) is able to phosphorylate Inh-2, this phosphorylation is not required for Inh-2 function. Overall, our results suggest a novel mechanism linking p42MAPK and PP1 pathways during M phase of the cell cycle.

• Wydawca: -
• Czasopismo: Cellular and Molecular Biology Letters
• Rocznik: 2011
• Tom: 16
• Numer: 4
• Opis fizyczny: p.669-688,fig.,ref.

Twórcy

autor

Khandani A.

• Department of Cell Biology, University of Alberta, Edmonton, Alberta, Canada T6G 2H7

autor

Mohtashami M.

autor

Camirand A.

Bibliografia

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