The effects of guanosine 5′-[beta-thio]triphosphate (GTP beta[S]) on G proteins have been examined in Chinese hamster lung fibroblasts (CCL39 line) permeabilized with alpha-toxin from Staphylococcus aureus. Although much less effective than guanosine 5′-[gamma-thio]triphosphate (GTP gamma[S]...