Probable component of the plant TOR kinase pathway that recruits substrates for TOR. Modulates plant cell growth and regulates the activity of ATPK1 kinase in response to osmotic stress. Interacts with TOR, ATPK1 and ML1. Interacts with KIN10 (PubMed:27545962). Expressed in roots, leaves, flowers and seeds. Phosphorylated by KIN10. Embryonic lethality when homozygous. Embryo development arrested at very early stage (early pre-globular stage), leading to aborted shrunken seeds. Constitutive autophagy (PubMed:27545962). Belongs to the WD repeat RAPTOR family.