Endosome maturation links PI3Kα signaling to lysosome repopulation during basal autophagy.

ABSTRACT: Autophagy depends on the repopulation of lysosomes to degrade intracellular components and recycle nutrients. How cells co-ordinate lysosome repopulation during basal autophagy, which occurs constitutively under nutrient-rich conditions, is unknown. Here, we identify an endosome-dependent phosphoinositide pathway that links PI3Kα signaling to lysosome repopulation during basal autophagy. We show that PI3Kα-derived PI(3)P generated by INPP4B on late endosomes was required for basal but not starvation-induced autophagic degradation. PI(3)P signals were maintained as late endosomes matured into endolysosomes, and served as the substrate for the 5-kinase, PIKfyve, to generate PI(3,5)P₂ . The SNX-BAR protein, SNX2, was recruited to endolysosomes by PI(3,5)P₂ and promoted l

SUBMITTER: Rodgers SJ 

PROVIDER: S-EPMC9531306 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature