p53 and c-Jun bind to PIAS1 and PIASxβ. 35S-labeled
in vitro translated p53 (A), c-Jun
(B), and luciferase (C), serving as a
negative control, were incubated with the indicated GST fusion proteins
bound to glutathione-Sepharose beads. Beads were washed, eluted, and
subjected to electrophoresis and autoradiography to reveal the bound
radiolabeled proteins. The input representing 20% for each
radiolabeled protein is shown.