{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRheb is a small, Ras‐related GTPase that functions as a pivotal activator of mTOR complex 1 (mTORC1), thereby regulating cell growth, metabolism, and protein synthesis. Under normal conditions, the tumor suppressor proteins TSC1 and TSC2 (which together act as a GTPase‐activating complex) keep Rheb in its inactive GDP–bound state; relief of this inhibition allows accumulation of GTP‐bound Rheb that directly interacts with mTOR to stimulate downstream effectors such as S6 kinase and 4E‑BP1 in response to nutrients, energy levels, and growth factors. In addition, nutrient availability (including specific amino acids like arginine) and endosomal trafficking modulate Rheb’s binding to mTOR, ensuring that mTOR activation is tightly coupled to cellular and environmental cues."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "8"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nStructural and biochemical studies reveal that Rheb possesses unique features that distinguish its switch regions and render its intrinsic GTPase activity relatively low compared to other family members. Localization of Rheb to endomembranes—as dictated by its C‐terminal farnesylation—is critical for productive mTOR binding. Moreover, Rheb engages in additional interactions beyond mTOR activation. It can inhibit the activity of kinases such as B‑Raf, functionally couple to effectors like phospholipase D1, and its activity may be modulated by binding partners such as FKBP38 or even by guanine nucleotide exchange factors like TCTP. These noncanonical functions—as well as its proper posttranslational processing—ensure that Rheb’s signaling output is finely tuned both spatially and temporally."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "9", "end_ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAberrant Rheb activity is increasingly recognized as a contributor to human disease. Hyperactivation of Rheb–mTORC1 signaling has been implicated in oncogenesis—including lymphomagenesis and prostate cancer—and in several disorders of the central nervous system such as cortical dysplasia, epilepsy, and neurodegeneration. In addition, stress stimuli (e.g. through redox or energy depletion pathways) can modulate Rheb via kinases such as PRAK, further integrating environmental signals with cell fate decisions. Rheb also plays roles in other contexts including modulation of apoptosis, regulation of protein processing relevant to Alzheimer’s disease, and even influencing inflammatory responses in infectious diseases. Such multifaceted functions not only underscore Rheb’s central position in cellular homeostasis but also mark it as an attractive target for therapeutic strategies using agents like rapamycin or farnesyl transferase inhibitors."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "19", "end_ref": "28"}, {"type": "fg_f", "ref": "18"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Ariel F Castro, John F Rebhun, Geoffrey J Clark, et al. 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