To gain insight into the organization of the Get1/2 complex, we developed a bulk fluorescence resonance energy transfer (FRET) assay in proteoliposomes that reports on changes in the proximity of Get1 and/or Get2 subunits upon binding to Get3. We introduced single cysteines at membrane-proximal (Get1-A95C; Get2-E220C) or cytosolic (Get1-S77C; Get2-S28C) positions within Get1 and Get2 (Figure 2Figure 2A). After purification (Figure S1x Download (10.64 MB ) Document S1.