This domain binds to phosphatidylinositol 4-phosphate. It is found in Legionella pneumophila DrrA, a protein involved in the redirection of endoplasmic reticulum-derived vesicles to the Legionella-containing vacuoles [1,2].

1: Structural mechanism of host Rab1 activation by the bifunctional Legionella type IV effector SidM/DrrA. Zhu Y, Hu L, Zhou Y, Yao Q, Liu L, Shao F; Proc Natl Acad Sci U S A. 2010;107:4699-4704. PMID:20176951

2: High-affinity binding of phosphatidylinositol 4-phosphate by Legionella pneumophila DrrA. Schoebel S, Blankenfeldt W, Goody RS, Itzen A; EMBO Rep. 2010;11:598-604. PMID:20616805