The role of Rsv1 in the transcriptional regulation of genes involved in sugar metabolism for long‐term survival

Glucose limitation is a major stress condition that cells must respond to by altering their metabolism to ensure survival. Rsv1 is a zinc finger protein previously shown to be required for survival during stationary phase. In this study, we present a novel mechanism regulated by Rsv1 in the fission yeast Schizosaccharomyces pombe that is involved in altering glucose metabolic flux. We found that rsv1 gene expression is induced by Rst2 and Atf1, two transcription factors regulated by the cAMP‐dependent protein kinase (PKA) pathway and the mitogen‐activated protein kinase (MAPK) cascade, respectively. The downstream target genes of Rsv1 were identified by genome‐wide ChIP sequencing of Rsv1‐bound DNA sites and RNA sequencing analysis of Rsv1‐dependent transcripts that were differentially expressed under glucose starvation. Rsv1 directly regulated the expression of at least 21 genes that mostly encode transporters and proteins related to sugar metabolism. Among these, gcd1, which encodes glucose dehydrogenase in the gluconate shunt for the pentose phosphate pathway, was most remarkably repressed by Rsv1. The defect in survival of Δrsv1 mutant under glucose starvation condition was mitigated by additional deletion of a gcd1, idn1, or a gene for a putative lactonase (SPCC16c4.10), suggesting the critical importance of downregulating the gluconate shunt and pentose phosphate pathway for long‐term survival. These results show an intricate response to glucose starvation: increasing the synthesis of a transcription factor via two signal transduction pathways, which sheds light on the importance of remodeling a metabolic circuit to secure glucose for cell survival.

• Publication year

  2020

• Venue

  The FEBS Journal

• Publication date

  2020-03-01

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1111/febs.15052PMID 31472097
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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