May be part of the TORC2 complex which plays a critical role in AKT1 'Ser-473' phosphorylation, and may modulate the phosphorylation of PKCA and regulate actin cytoskeleton organization. Belongs to the PROTOR family. May replace PROTOR1 in the target of rapamycin 2 complex (TORC2) comprised of FRAP1, LST8, PROTOR1, RICTOR and MAPKAP1. 3 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.