FIGURE 5:
Alp41 interacts with Alp1D only when in its GDP-bound form. (A–C) Immunoprecipitation. IPs were performed using a doubly tagged strain expressing the mutated form of Alp41 tagged with GFP and Alp1D-3Pk. First lane, control strain expressing GFP-Alp41 only; second lane, Alp1D-3Pk only; third lane, the doubly tagged strain. A 30-μg amount of whole-cell extract was loaded as a control. (A) Wild-type Alp41, (B) GTP-bound Alp41-Q70L, and (C) GDP-bound Alp41-T47A. (D) Genetic interactions between Tbc1, Alp41, and Alp1D. Mutants of each gene were crossed and growth/lethality observed. SL, synthetic lethality.