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Eukaryotes harbour a conserved signalling pathway, called General Amino Acid Control (GAAC) in Saccharomyces cerevisiae, for overcoming amino acid starvation. Upon starvation, the protein kinase Gcn2, which phosphorylates the eukaryotic translation initiation factor eIF2α, becomes stimulated to trigger the GAAC response. Genetic studies suggest that Yih1, which is the yeast homolog of mammalian IMPACT...