OTUB1 increases RAS activity and enhances MAPK activation in wt RAS cells OTUB1 increases RAS activity and enhances MAPK activation in wt RAS cells A,

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OTUB1 increases RAS activity and enhances MAPK activation in wt RAS cells OTUB1 increases RAS activity and enhances MAPK activation in wt RAS cells A, BOTUB1 overexpression promotes serum‐induced activation of endogenous wt RAS (A) or wt NRAS (B). GTP‐bound RAS was pulled down from HEK293T cells expressing HA‐tagged OTUB1 or empty vector (V) using recombinant RAF1 RBD conjugated to agarose beads. Input was controlled by immunoblotting using anti‐panRAS or anti‐Flag antibodies.C, DOTUB1 enhances serum‐induced ERK1/2 phosphorylation in endogenous wt RAS (C) or wt KRAS (D). Levels of phosphorylated ERK1/2 and total ERK1/2 in HEK293T cells expressing HA‐tagged OTUB1 or empty vector (V) were analyzed by Meso Scale assay. The results are expressed as a mean of pERK1/2 levels relative to total ERK1/2 ± s.e.m. n = 2. P‐values were determined by two‐sided t‐Test.E, FOverexpression of wt OTUB1 (E) or the catalytically dead mutant OTUB1 C91S (F) promotes serum‐induced MAPK activation in cell expressing wt NRAS. Whole cell lysates were analyzed by immunoblotting using the indicated antibodies.G, HOverexpression of OTUB1 has no effect on serum‐induced MAPK activation in cell expressing mutant NRAS Q61K or KRAS G12V. Whole cell lysates were analyzed by immunoblotting using antibodies as indicated.IImmunoblot of OTUB1 overexpression in immortalized human embryonic kidney epithelial cells (HEK TEST), expressing empty vector (V), myristoylated AKT1 (myr‐AKT), MEK1 D218, D222‐mutant (MEKDD).J, KOTUB1 cooperates with active AKT1 to promote anchorage‐independent growth. Representative images of soft‐agar colonies formed by HEK TEST cells expressing the indicated constructs. The number of soft agar colonies formed by cells expressing OTUB1 compared to cells expressing an empty vector. Data are presented as mean ± s.e.m. P‐values were determined by two‐sided t‐Test, n = 2.Data information: (A–H) Serum‐starved HEK293T cells expressing the indicated constructs were stimulated with 10% serum for the indicated time periods. Source data are available online for this figure. Maria Francesca Baietti et al. EMBO Mol Med. 2016;8:288-303 © as stated in the article, figure or figure legend