Acts as a receptor for reticulophagy and nucleophagy. Directs autophagic sequestration of double-membrane vesicles derived from the nuclear envelope and perinuclear endoplasmic reticulum (pnER) into autophagosomes. Is not required for the cytoplasm-to-vacuole targeting pathway, mitophagy, pexophagy, and non-selective autophagy. Interacts with ATG8 and ATG11. Expression is increased by rapamycin, which mimics nitrogen starvation by inactivating the TORC1 complex. Partially blocks reticulophagy, and the double ATG39/ATG40 knockout almost completely blocks this pathway. Leads to abnormal morphology in the nucleus/pnER, when exposed to prolonged nitrogen starvation.