Phosphatidylinositol 3-kinase homolog, component of TORC2, which regulates multiple cellular processes to control cell growth in response to environmental signals. TORC2 is required for cell survival under various stress conditions. TORC2 positively controls G1 cell-cycle arrest, sexual development and amino acid uptake. Positively regulates amino acid uptake through the control of expression of amino acid permeases (PubMed:11409178, PubMed:11096119, PubMed:15466417, PubMed:17179073). Responsible for the phosphorylation of AGC kinase gad8 at 'Ser-527' and 'Ser-546', activating gad8 kinase activity and promoting sexual development (PubMed:12805221). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] The target of rapamycin complex 2 (TORC2) is composed of at least bit61, pop3/wat1, sin1, ste20 and tor1. By nitrogen and/or carbon starvation, cold, osmotic and oxidative stress. Phosphorylation at Thr-1972 in the ATP-binding region by AKT1 strongly reduces kinase activity. Belongs to the PI3/PI4-kinase family.