Project description:Snf1 and TORC1 are two global regulators that sense the nutrient availability and regulate the cell growth in yeast Saccharomyces cerevisiae. Here we undertook a systems biology approach to study the effect of deletion of these genes and investigate the interaction between Snf1 and TORC1 in regulation of gene expression and cell metabolism.
Project description:Snf1 and TORC1 are two global regulators that sense the nutrient availability and regulate the cell growth in yeast Saccharomyces cerevisiae. Here we undertook a systems biology approach to study the effect of deletion of these genes and investigate the interaction between Snf1 and TORC1 in regulation of gene expression and cell metabolism. 3 mutant strains (snf1?, tor1?, snf1?tor1?) together with 1 reference strain grown under both glucose-limited or amonia-limited defined media with three biological replicates for each strain
Project description:The conserved Snf1/AMPK (AMP-activated protein Kinase) family is one of the central components in nutrient sensing and regulation of carbon metabolism in eukaryotes. It is also involved in several other processes such as stress resistance, invasive growth and ageing. Snf1 kinase is composed of a catalytic α-subunit Snf1, a regulatory γ-subunit Snf4 and one of three possible β-subunits, Sip1, Sip2 or Gal83. We used a systematic approach to study the role of the three β-subunits by analyzing all 7 possible combinations of β-subunit deletions together with the reference strain.
Project description:The conserved Snf1/AMPK (AMP-activated protein Kinase) family is one of the central components in nutrient sensing and regulation of carbon metabolism in eukaryotes. It is also involved in several other processes such as stress resistance, invasive growth and ageing. Snf1 kinase is composed of a catalytic alpha-subunit Snf1, a regulatory gamma-subunit Snf4 and one of three possible beta-subunits, Sip1, Sip2 or Gal83. We used a systematic approach to study the role of the three beta-subunits by analyzing all 7 possible combinations of beta-subunit deletions together with the reference strain.
Project description:The Snf1 kinase plays a critical role in recalibrating cellular metabolism in response to glucose depletion. Hundreds of genes show changes in expression levels when the SNF1 gene is deleted. However, cells can adapt to the absence of a specific gene when grown in long term culture. Here we apply a chemical genetic method to rapidly and selectively inactivate a modified Snf1 kinase using a pyrazolopyrimidine inhibitor. By allowing cells to adjust to a change in carbon source prior to inhibition of the Snf1 kinase activity, we identified a set of genes whose expression increased when Snf1 was inhibited. Prominent in this set are genes that are activated by Gcn4, a transcriptional activator of amino acid biosynthetic genes. Deletion of Snf1 increased Gcn4 protein levels without affecting its mRNA levels. The increased Gcn4 protein levels required the Gcn2 kinase and Gcn20, regulators of GCN4 translation. These data indicate that Snf1 functions upstream of Gcn20 to regulate control of GCN4 translation. Experiment Overall Design: Strains growing in raffinose medium and expressing Snf1 and Snf1-I132G proteins were treated with a pyrazolopyrimidine inhibitor (2NM-PP1) to specifically inhibit Snf1-I132G kinase activity. RNA combined from three individual transformants were processed in duplicate for each strain, for a total analysis of four Affymetrix Yeast Genome S98 arrays.
Project description:Treatment of cells with DNA damaging agents leads to large-scale gene expression changes. Proper transcriptional regulation is important for cells to arrest, repair damage and adjust cellular processes such as metabolism in order to survive the damaging assault. Damage-induced transcription is a highly regulated response. This study establishes a novel role for two factors, Snf1 and Rad23, in regulation of the UV-induced transcriptional response.
Project description:Snf1/AMPK functions as a heterotrimeric complex, consisting of a regulatory subunit that is senses the energy status, a catalytic subunit with the canonical kinase domain and a scaffolding subunit to secure the complex together. The high degree of conservation in the sequence, structure and function of yeast Snf1 and mammalian AMPK, it is only logical to investigate the extent of conservation in the downstream effects that are controlled by these kinases.
