Presenilins mediate efficient proteolysis via the autophagosome-lysosome system.

Degradation through the lysosome involves careful orchestration of numerous molecular players in concert. Many of these key molecular players remain to be identified. We find that wild-type presenilins play a key role in degradation through the autophagy-lysosome system by modulating either fusion of autophagosomes to lysosomes or lysosome function.