Phosphorylation of CDC25C by AMP-activated protein kinase mediates a metabolic checkpoint during cell-cycle G2 /M-phase transition

The Journal of Biological Chemistry
Yuqing ShenRuoning Wang

Abstract

From unicellular to multicellular organisms, cell-cycle progression is tightly coupled to biosynthetic and bioenergetic demands. Accumulating evidence has demonstrated the G1/S-phase transition as a key checkpoint where cells respond to their metabolic status and commit to replicating the genome. However, the mechanism underlying the coordination of metabolism and the G2/M-phase transition in mammalian cells remains unclear. Here, we show that the activation of AMP-activated protein kinase (AMPK), a highly conserved cellular energy sensor, significantly delays mitosis entry. The cell-cycle G2/M-phase transition is controlled by mitotic cyclin-dependent kinase complex (CDC2-cyclin B), which is inactivated by WEE1 family protein kinases and activated by the opposing phosphatase CDC25C. AMPK directly phosphorylates CDC25C on serine 216, a well-conserved inhibitory phosphorylation event, which has been shown to mediate DNA damage-induced G2-phase arrest. The acute induction of CDC25C or suppression of WEE1 partially restores mitosis entry in the context of AMPK activation. These findings suggest that AMPK-dependent phosphorylation of CDC25C orchestrates a metabolic checkpoint for the cell-cycle G2/M-phase transition.

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Citations

Oct 12, 2019·Experimental and Therapeutic Medicine·Yanchun LiuBingzhi Yu
Oct 29, 2020·Technology in Cancer Research & Treatment·Ruifeng XunXianwang Wang
Dec 25, 2019·Molecular Cancer Therapeutics·Karine Flem-KarlsenVivi Ann Flørenes
Feb 18, 2021·Cell Reports·Yuejing JiangYi Zang
Jun 3, 2021·Cell Reports·Annelise Y Mah-SomMegan A Cooper

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Methods Mentioned

BETA
immunoprecipitation
FACS
transfection
protein assay
flow cytometry
PCR

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