LidA, another Rab1-interacting bacterial effector protein [1], is translocated by Legionella into the host cytosol at the beginning of infection, and it localized to the Legionella-containing vacuole (LCV) at the cytosolic surface [2]. It has been shown that tight interaction with Rab1 allows LidA to facilitate the Legionella targeting factor (DrrA/SidM)-catalyzed release of Rab1 from GDP dissociation inhibitors (GDI) [1]. The base of the protein is formed by two antiparallel coiled-coil structures forming a long coiled-coil domain [1, 2]. This region of LidA interacts with switch and interswitch regions of Rab1 [1] the nucleotide binding pocket of Rab8a [2], hence blocking access to the GDP/GTP-binding site to a great extent [1].

1: Structural insights into a unique Legionella pneumophila effector LidA recognizing both GDP and GTP bound Rab1 in their active state. Cheng W, Yin K, Lu D, Li B, Zhu D, Chen Y, Zhang H, Xu S, Chai J, Gu L; PLoS Pathog. 2012;8:e1002528. PMID:22416225

2: Protein LidA from Legionella is a Rab GTPase supereffector. Schoebel S, Cichy AL, Goody RS, Itzen A; Proc Natl Acad Sci U S A. 2011;108:17945-17950. PMID:22011575