The macrolide antibiotic rapamycin and the cytosol protein FKBP12 can form a complex which specifically inhibits the TORC1 complex, leading to growth arrest. The FKBP12-rapamycin complex interferes with TORC1 function by binding to the FKBP12-rapamycin binding domain (FRB) of the TOR proteins. This entry represents the FRB domain [1, 2].

1: Structure of the FKBP12-rapamycin complex interacting with the binding domain of human FRAP. Choi J, Chen J, Schreiber SL, Clardy J; Science. 1996;273:239-242. PMID:8662507

2: Ubiquitin regulates TORC1 in yeast Saccharomyces cerevisiae. Hu K, Guo S, Yan G, Yuan W, Zheng Y, Jiang Y; Mol Microbiol. 2015; [Epub ahead of print] PMID:26700129

3: Molecular Basis of the Rapamycin Insensitivity of Target Of Rapamycin Complex 2. Gaubitz C, Oliveira TM, Prouteau M, Leitner A, Karuppasamy M, Konstantinidou G, Rispal D, Eltschinger S, Robinson GC, Thore S, Aebersold R, Schaffitzel C, Loewith R; Mol Cell. 2015;58:977-988. PMID:26028537