FIG. 2.
GTP/GDP loading of Raichu-Rac and Raichu-Cdc42. 293T cells expressing Raichu-Rac, Raichu-Cdc42, Flag-tagged Rac, and Flag-tagged Cdc42 were labeled with 32Pi. The G proteins were precipitated with either anti-GFP rabbit serum or an anti-Flag monoclonal antibody, followed by TLC analysis. GTP and GDP were quantitated with a BAS-1000 image analyzer, and values of GTP/(GTP + GDP) with standard deviations were plotted. Asterisks indicate that no 32Pi-labeled guanine nucleotides were detected.