The FATC domain is named after FRAP, ATM, TRRAP C-terminal [1]. The solution structure of the FATC domain suggests it plays a role in redox-dependent structural and cellular stability [2].

1: FAT: a novel domain in PIK-related kinases. Bosotti R, Isacchi A, Sonnhammer ELL; Trends Biochem Sci 2000;25:225-227. PMID:10782091

2: The solution structure of the FATC domain of the protein kinase target of rapamycin suggests a role for redox-dependent structural and cellular stability. Dames SA, Mulet JM, Rathgeb-Szabo K, Hall MN, Grzesiek S; J Biol Chem 2005;280:20558-20564. PMID:15772072