(A) The ELM2/cGTPase interface can be divided into three regions (insets 1-3). Select residues are shown as sticks, polar contacts as dashed lines, and Mg2+ and MgGDP as spheres. Region 1: αC2 and the hEF2 loop form both backbone and side‐chain contacts with αG1 and Switch I in the cGTPase, including the Switch I threonine T481. Region 2: αD2 in hEF2 packs against the twisting cGTPase β‐strands Gβ1‐3. Region 3: the candidate Pink1 phosphorylation site residue S324 in Lnk1 hydrogen bonds with R444 in Lnk2, which also forms a salt bridge with D521, at the end of the Switch II loop. 