Rheb is a GTP binding protein that exhibits GTPase activity. GDP is exchanged for GTP in the [Rheb:GDP] complex to form [Rheb:GTP], which binds and activates the mTORC1 complex. The GDP-bound form of Rheb also binds mTORC1 but does not lead to activation. This exchange may be catalysed by an as yet unidentified guanine exchange factor (GEF); the intrinsic exchange activity of Rheb may be sufficient in the absence of a GEF.
Inoki, K, Guan, KL, Ouyang, H, Li, Y
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