AKT1S1 is a proline-rich substrate of AKT (MIM 164730) that binds 14-3-3 protein (see YWHAH, MIM 113508) when phosphorylated (Kovacina et al., 2003 [PubMed 12524439]).[supplied by OMIM, Mar 2008]
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Function:
Negative regulator of the mechanistic target of rapamycin complex 1 (mTORC1), an evolutionarily conserved central nutrient sensor that stimulates anabolic reactions and macromolecule biosynthesis to promote cellular biomass generation and growth (By similarity).In absence of insulin and nutrients, AKT1S1 associates with the mTORC1 complex and directly inhibits mTORC1 activity by blocking the MTOR substrate-recruitment site (By similarity).In response to insulin and nutrients, AKT1S1 dissociates from mTORC1 (By similarity).Its activity is dependent on its phosphorylation state and binding to 14-3-3 (By similarity).May also play a role in nerve growth factor-mediated neuroprotection (PubMed:14973226, PubMed:16397181).
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Cellular Localization:
Cytoplasm > cytosol. Found in the cytosolic fraction of the brain.
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Tissue Expression:
Widely expressed with highest levels of expression in liver and heart. Expressed at higher levels in cancer cell lines (e.g. A-549 and HeLa) than in normal cell lines (e.g. HEK293).