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The yeast eIF4E-associated protein Eap1p attenuates GCN4 translation upon TOR-inactivation
Ryu Matsuo1, Hiroyuki Kubota, Tohru Obata
1Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
FEBS Letters
|April 26, 2005
Summary
Yeast amino acid starvation activates Gcn2p kinase, while nutrient-rich conditions activate TOR signaling. This study reveals Eap1p acts downstream of Gcn2p to control GCN4 translation after TOR inactivation, linking these pathways.
Area of Science:
- Molecular Biology
- Yeast Genetics
- Cellular Signaling
Background:
- Yeast utilizes the general amino acid control (GAAC) pathway, involving Gcn2p kinase, to respond to amino acid starvation by upregulating biosynthetic genes.
- The target of rapamycin (TOR) pathway stimulates protein synthesis in nutrient-rich conditions via the eIF4F complex.
- Crosstalk exists between GAAC and TOR pathways, as evidenced by rapamycin activating Gcn2p.
Purpose of the Study:
- To investigate the role of the putative TOR-regulated protein Eap1p in the interplay between GAAC and TOR signaling pathways.
- To elucidate the mechanism by which Eap1p influences GCN4 translation following TOR inactivation.
Main Methods:
- Yeast genetics and molecular biology techniques.
- Analysis of protein interactions and translational control mechanisms.
- Investigating the impact of TOR inactivation on GCN4 mRNA translation.
Main Results:
- Upon TOR inactivation, Eap1p functions downstream of Gcn2p.
- Eap1p attenuates GCN4 translation through a mechanism independent of eIF4E binding.
- This identifies Eap1p as a novel interface connecting GAAC and TOR signaling.
Conclusions:
- Eap1p plays a crucial role in integrating signals from the TOR and GAAC pathways.
- The findings reveal a new layer of translational regulation in response to nutrient availability.
- This research deepens our understanding of cellular adaptation to environmental changes.