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Disruption of Tumor Suppressive Functions by B56γ3 Mutants in Cancer Cell Lines

leo-huffman avatar
leo-huffman
3 diapositives · 156 Views · Nov 07, 2014

This study investigates the interaction dynamics of wild-type and F395C mutant B56γ3 with endogenous B56γ proteins in U2OS cells through HA immunoprecipitation and Western blot analyses. Additionally, the growth and transformation abilities of various B56γ3 mutants, including A383G, were evaluated in HCT116 cells. Our findings highlight the inability of specific B56γ3 mutants to support p53-mediated tumor suppressive functions, underscoring the importance of these interactions in cancer progression.

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Disruption of Tumor Suppressive Functions by B56γ3 Mutants in Cancer Cell Lines
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  1. Input HA-IP WT F395C WT F395C IgG Exogenous B56γ3 Endogenous B56γ2,3 Vinc Figure S1 HA-B56γ3 is unable to interact with endogenous B56γ. Lysates of U2OS cells transfected with either wild type or F395C mutant B56γ3, were immunoprecipitated with HA antibody, then analyzed by western blot against B56γ and vinculin (vinc).

  2. A B C Figure S2 Statistical analysis of cell growth and transformation data. P-values for anchorage independent cell growth experiments from Figure 3 (A); for HCT116 cells growth experiments from Figure 4A (B); and for H1299 cell cells growth experiments from Figure 4B (C) were calculated by comparing the effect of expressing the various mutants either versus the EV control or versus the wild type protein.

  3. A B56γ: Cancer: 376-IHGLIYNALKLFMEMNQKLFDDCTQQF-402 GC B C Input HA-IP F395C A383G B56γ3 EV A383G A383G B56γ3 B56γ3 EV EV Thr55 P p53 p21 HCT116 +/+ HCT116 -/- PP2A A HA PP2A C p53 HA vinc vinc D HCT116 -/- HCT116 +/+ A383G A383G B56γ3 B56γ3 M M 120 B56γ3 100 80 p53 % Cells at 120 hours 60 vinc 40 E 20 0 WT EV A383G Figure S3 The A383G mutant is unable to promote p53-dependent tumor suppressive functions. (A) Amino acid sequence of B56γ showing the p53-interaction domain, adjacent regions and the cancer-derived mutations. Lysates of U2OS cells transfected with HA-tagged B56γ3, A383G, or an empty vector control, were either immunoprecipitated with anti-HA antibody, then analyzed by western blot against p53, PP2A A and C, HA, and vinculin (B); or analyzed for p53 Thr55 phosphorylation, p21 protein levels, HA, p53, and vinculin (C). (D) Representatives of cell proliferation of HCT116 cells were transfected with either wild type, or A383G, or an empty vector control. Numbers of cells present at the 120 hour time point were normalized against the representative empty vector controls and plotted in a bar graph. Error bars show average +/- s.d. from triplicate plates in one representative experiment. Cell lysates were analyzed by immunoblotting of the transfected HA-B56γ3, endogenous B56γ3/B56γ2, and p53 proteins. M: empty vector-transfected cell lysate at seeding. (E) Statistical analysis of cell growth from (D).