Metabolic remodeling maintains a reducing environment for rapid activation of the yeast DNA replication checkpoint

Lili Li, Jie Wang, Zijia Yang, Yiling Zhao, Hui Jiang, Luguang Jiang, Wenya Hou, Risheng Ye, Qun He, Martin Kupiec, Brian Luke, Qinhong Cao, Zhi Qi, Zhen Li, Huiqiang Lou

Research output: Contribution to journalArticlepeer-review

Abstract

Nucleotide metabolism fuels normal DNA replication and is also primarily targeted by the DNA replication checkpoint when replication stalls. To reveal a comprehensive interconnection between genome maintenance and metabolism, we analyzed the metabolomic changes upon replication stress in the budding yeast S. cerevisiae. We found that upon treatment of cells with hydroxyurea, glucose is rapidly diverted to the oxidative pentose phosphate pathway (PPP). This effect is mediated by the AMP-dependent kinase, SNF1, which phosphorylates the transcription factor Mig1, thereby relieving repression of the gene encoding the rate-limiting enzyme of the PPP. Surprisingly, NADPH produced by the PPP is required for efficient recruitment of replication protein A (RPA) to single-stranded DNA, providing the signal for the activation of the Mec1/ATR–Rad53/CHK1 checkpoint signaling kinase cascade. Thus, SNF1, best known as a central energy controller, determines a fast mode of replication checkpoint activation through a redox mechanism. These findings establish that SNF1 provides a hub with direct links to cellular metabolism, redox, and surveillance of DNA replication in eukaryotes.

Original languageEnglish
Article numbere108290
JournalEMBO Journal
Volume41
Issue number4
DOIs
StatePublished - 15 Feb 2022

Keywords

  • DNA replication stress
  • carbon metabolism
  • cell cycle checkpoints
  • genome stability
  • reductive/oxidative (redox)

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