Figure 10.
TAT-NBD inhibited basal and LPS-induced IKK activity in a dose-dependent manner. The effect of TAT-NBD on constitutive and LPS-induced IKK activity was studied with in vitro kinase assay. Cells (6 × 106) pretreated with either buffer control, TAT-NBD (NBD), or the mutant control (MUT) were stimulated with 1 μg/mL LPS or left untreated. Whole cell lysates were immunoprecipitated with a monoclonal IKKα antibody. Precipitates were incubated with 1 μg GST-IκBα and 3 μCi (0.111 MBq) [γ-32]ATP. Samples were boiled and subjected to 12% SDS-PAGE and autoradiography. Equal loading was confirmed by IKKα Western blot.