Fig. 3.
Heterotrimeric G protein α subunits are discovered to be structural relatives of other regulatory GTPases. Tα, transducin α; Gα37, Goα: Sc ras1, ras1 of the baker’s yeast Saccharomyces cerevisiae; Ypt1, the Saccharomyces cerevisiae homologue of rab1 (rat brain ras like protein 1) (Adapted from Hurley et al., 1984a [16]).