Serine/threonine protein kinase involved in autophagy in a nutritional condition-dependent manner. The ATG1-ATG13 protein kinase complex regulates downstream events required for autophagosome enclosure and/or vacuolar delivery. Becomes a target of autophagy under nutrient starvation. Connects autophagy to plant nutritional status. Interacts with ATG13A (PubMed:21984698). Interacts with ATG8E. Binds to ATG8E on autophagic vesicles (PubMed:24563201). A number of isoforms are produced. According to EST sequences. Phosphorylated during nutrient starvation. Dephosphorylated in nutrient-rich conditions. No visible phenotype under normal growth conditions. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.