ATG9A and ARFIP2 cooperate to control PI4P levels for lysosomal repair.

ABSTRACT: Lysosome damage activates multiple pathways to prevent lysosome-dependent cell death, including a repair mechanism involving endoplasmic reticulum (ER)-lysosome membrane contact sites, phosphatidylinositol 4-kinase-2a (PI4K2A), phosphatidylinositol-4 phosphate (PI4P), and oxysterol-binding protein-like proteins (OSBPLs) lipid transfer proteins. PI4K2A localizes to the trans-Golgi network and endosomes, yet how it is delivered to damaged lysosomes remains unknown. During acute sterile damage and damage caused by intracellular bacteria, we show that ATG9A-containing vesicles perform a critical role in delivering PI4K2A to damaged lysosomes. ADP ribosylation factor interacting protein 2 (ARFIP2), a component of ATG9A vesicles, binds and sequesters PI4P on lysosomes, balancing OSBPL-dependent

SUBMITTER: De Tito S 

PROVIDER: S-EPMC7617826 | biostudies-literature | 2025 May

REPOSITORIES: biostudies-literature