
Macroautophagy (hereafter autophagy) is a well-conserved cellular process through which cytoplasmic components are delivered to the vacuole/lysosome for degradation and recycling. Studies have revealed the molecular mechanism of transcriptional regulation of autophagy-related (ATG) genes upon nutrient deprivation. However, little is known about their translational regulation. Here, we found that Dhh1, a DExD/H-box RNA helicase, is required for efficient translation of Atg1 and Atg13, two proteins essential for autophagy induction. Dhh1 directly associates with ATG1 and ATG13 mRNAs under nitrogen-starvation conditions. The structured regions shortly after the start codons of the two ATG mRNAs are necessary for their translational regulation by Dhh1. Both the RNA-binding ability and helicase activity of Dhh1 are indispensable to promote Atg1 translation and autophagy. Moreover, eukaryotic translation initiation factor 4E (EIF4E)-associated protein 1 (Eap1), a target of rapamycin (TOR)-regulated EIF4E binding protein, physically interacts with Dhh1 after nitrogen starvation and facilitates the translation of Atg1 and Atg13. These results suggest a model for how some ATG genes bypass the general translational suppression that occurs during nitrogen starvation to maintain a proper level of autophagy.
Saccharomyces cerevisiae Proteins, QH301-705.5, Nitrogen, Autophagy-Related Proteins, Saccharomyces cerevisiae, Protein Serine-Threonine Kinases, DEAD-box RNA Helicases, HEK293 Cells, Proto-Oncogene Proteins, Autophagy, Humans, Biology (General), Phosphorylation, Protein Kinases, Research Article, Adaptor Proteins, Signal Transducing, Protein Binding, Transcription Factors
Saccharomyces cerevisiae Proteins, QH301-705.5, Nitrogen, Autophagy-Related Proteins, Saccharomyces cerevisiae, Protein Serine-Threonine Kinases, DEAD-box RNA Helicases, HEK293 Cells, Proto-Oncogene Proteins, Autophagy, Humans, Biology (General), Phosphorylation, Protein Kinases, Research Article, Adaptor Proteins, Signal Transducing, Protein Binding, Transcription Factors
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