Additional Supporting Information may be found in the online version of this article.

HEP_26352_sm_SuppFig1.tif205KSupporting Information Figure 1. eIF3I and Akt1 interaction is phosphorylation-dependent. (A) Treatment of calf-intestinal alkaline phosphatase (CIP) reduced interaction of overexpressed- eIF3I and Akt1 in 293T cells. (B) Treatment of Insulin-like growth factor 1 (IGF-1) to 293T transfectants of eIF3I and Akt1 increased phosphorylation of Akt1 and its interaction with eIF3I.
HEP_26352_sm_SuppFig2.tif126KSupporting Information Figure 2. eIF3I interrupted Akt1 protein interactions with PP2A. Akt1 can interact with PP2A-B and PP2A-C in 293 cells but loss their protein interactions when co- transfection with eIF3I. Tubulin served as protein loading control.
HEP_26352_sm_SuppFig3.tif231KSupporting Information Figure 3. eIF3I is not an Akt1 substrate. (A) Autoradiography of in vitro 32P-labeled kinase assay: detection of phosphorylated protein in immunoprecipitated complex in 293 cells with constitutively active Akt1 (myr-Akt1). (B) Detection of Akt1 phospho-substrate signal in HA-precipitated immune-complexes in 293T cells. Western blotting analysis of abovementioned proteins and tubulin served as expression and internal controls in lower panels.
HEP_26352_sm_SuppFig4.tif131KSupporting Information Figure 4. The subcellular localization of eIF3I-activated Akt1. Akt1 and eIF3I proteins are mainly localized in cytoplasm fraction and detectable in fractions of plasma membrane and nucleus. Tubulin, E-cadherin and histone H3 protein expression served as localization controls of cytoplasm, membrane and nucleus respectively.
HEP_26352_sm_SuppFig5.tif208KSupporting Information Figure 5. Growth effect of sorafenib treatments on eIF3I-overexpressed HepG2 cells. Gray and full columns represent the cell proliferation activity of eIF3I-overexpressed and vector only HepG2 transfectants, respectively, treated with various doses (0∼10 μM) of sorafenib for 2 days.
HEP_26352_sm_SuppTab1.doc105KSupporting Information Table 1. Clinical features and immunohistochemistry results of eIF3I and pAKT1 antibodies of 59 HCC patients.
HEP_26352_sm_SuppInfo.doc88KSupporting Information Figure 1.

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