Figure 4. MAD2B and RAN interact throughout the cell cycle.
COS-1 cells were transiently transfected with MAD2B, blocked at different phases in the cell cycle and, subsequently, released from these cell cycle blocks during different time intervals. (1) cells isolated from a confluent culture, (2) cells isolated 3 h after 1∶2 splitting of a confluent culture, (3) cells blocked with nocodazole, (4) cells blocked with nocodazole and released for 4 h, (5) cells blocked with nocodazole and released for 8 h, (6) cells blocked with hydroxyurea, and (7) cells blocked with hydroxyurea and released for 6 h. (A) FACS profiles confirming the presence of the cells in the different phases of the cell cycle are shown. (B) Western blot analysis of total lysates with anti-RAN, anti-MAD2B and anti-γ-tubulin antibodies (Input) and after anti-RAN immunoprecipitation of the respective lysates (1–7) using an anti-MAD2B antibody (IP).