Involved in the regulation of endocytosis and in several stages of intracellular trafficking. Plays a role in recycling endocytosed transferrin receptor and prevent its degradation. Involved in autophagosome assembly by regulating trafficking and recycling of phospholipid scramblase ATG9A. Heterodimer; heterodimerizes with SNX7 or SNX30. Interacts with WWC1/KIBRA. Identified in a complex with WWC1/KIBRA and dynein components DYNLL1 and DYNC1I2. Interacts with BIN1. Also detected on a juxtanuclear endocytic recycling compartment (ERC). The PX domain binds phosphatidylinositol 3-phosphate which is necessary for peripheral membrane localization. Belongs to the sorting nexin family.