Hamartin (TSC1)

In complex with TSC2, inhibits the nutrient-mediated or growth factor-stimulated phosphorylation of S6K1 and EIF4EBP1 by negatively regulating mTORC1 signaling (PubMed:12271141, PubMed:28215400). Seems not to be needed for TSC2 GAP activity towards RHEB (PubMed:15340059).

Implicated as a tumor suppressor. Involved in microtubule-mediated protein transport, but this appears to be due to unregulated mTOR signaling (By similarity).