A High Copy Suppressor Screen for Autophagy Defects in Δ and Δ Strains.

In , Arl1 and Ypt6, two small GTP-binding proteins that regulate membrane traffic in the secretory and endocytic pathways, are also necessary for autophagy. To gain information about potential partners of Arl1 and Ypt6 specifically in autophagy, we carried out a high copy number suppressor screen to identify genes that when overexpressed suppress the rapamycin sensitivity phenotype of Δ and Δ strains at 37°. From the screen results, we selected , , , , , , and , either membrane traffic or autophagy regulators, to further test whether they can suppress the specific autophagy defects of Δ and Δ strains. As a result, we identified , , and to be specific suppressors for the Δ strain, and and for the Δ strain. Through this screen, we were able to confirm several membrane traffic and autophagy regulators that have novel relationships with Arl1 and Ypt6 during autophagy.