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. 2019 Nov 27;9:17663. doi: 10.1038/s41598-019-54184-0

Figure 1.

Figure 1

KDM5B is serine phosphorylated by CDK1. MDA-MB-231 cells were infected with control shRNA lentiviruses or CDK1 shRNA lentiviruses. (a) Lysates from MDA-MB-231 cells were immunoprecipitated using antibodies against phosphorylated serine (pS) and analyzed for KDM5B by Western blotting. (b) MDA-MB-231 cells were treated with kinase inhibitors (Erk inhibitor, Vx: Vx-11e, 100 μM or CDK1 inhibitor, RO: RO3306, 10 μM) and lysates were immunoprecipitated using antibodies against KDM5B and analyzed for phosphorylated serine by Western blotting. (c) Lysates from MDA-MB-231 cells were immunoprecipitated using antibodies against KDM5B and CDK1 and analyzed for co-immunoprecipitation of CDK1 and KDM5B, respectively, by Western blotting. Normal rabbit IgG was used as a negative control. Input lanes represent 25% of the total protein. (d) Upper panel: In vitro kinase assay wherein recombinant cyclin B1 were incubated with purified GST-KDM5B in the absence or presence of CDK1 or ATP. Phosphoserine signal was detected by Western blotting. Lower panel: Western blot analyses of purified GST-KDM5B used in kinase assays. Figures are representative of at least 3 independent experiments.