p70S6K suppresses BAD-mediated death in a S136-dependent manner. Rat-1a
cells were transiently cotransfected with a luciferase reporter
together with constructs expressing either BAD wild-type (Wt), S112A,
S136A, or S112AS136A together with constructs expressing either p70S6K
Wt or a kinase-dead (KD) mutant (Lys-100 → Gln) that does not bind
ATP. Twenty-four hours after transfection, serum was withdrawn for
16 h. Luciferase activity (ordinate, arbitrary units) has been
shown to represent the viability of the cells defined (9,
27), and this assay is representative of three independent
experiments.