Figure 8. Working model of Sec18p regulation by PA.
Sec18p associates with vacuole membranes through direct interactions with PA. Upon PA hydrolysis by Pah1p, Sec18p is no longer sequestered on the membrane away from cis-SNAREs and is recruited to them to carry out priming activity. Red ovals depict PA’s phosphate headgroup. Blue ovals depict generic lipid head groups.