Figure 2: Rb binding site overlaps with the Plk1 phosphorylation sites in FoxM1b.

MCF7 cells were transiently transfected with GFP-FoxM1 (FL) or the indicated FoxM1 deletion mutants. Cell lysates were prepared from transfected cells after 48 hr. Cell lysates (700 ug) were immunoprecipitated with GFP antibody followed by western blotting with Rb-antibody (A,C). Immunoprecipitation of the GFP constructs are shown in panels B and D. (E) Schematic representation of the Rb binding site within the C-terminal domain of FoxM1.