The Tsc1-Tsc2 complex is a heterodimeric GTPase Activating Protein (GAP) complex that negatively regulates mTOR (TORC1 complex) signaling. The Tsc1-Tsc2 complex stimulates the small GTPase,
Rheb, to hydrolyze bound GTP to GDP. GTP-bound
Rheb activates TORC1. (Adapted from
FBrf0214848 and
FBrf0136941).