This is the C-terminal domain of retinitis pigmentosa G-protein regulator (RPGR) interacting protein-1 present in Homo sapiens. A mutation in RPGR interacting protein-1 can be observed in the eye disease Leber congenital amaurosis. The domain is commonly known as the RPGR-interacting domain (RID) and is thought to have a C2-like fold [1].

1: C2 domains as protein-protein interaction modules in the ciliary transition zone. Remans K, Burger M, Vetter IR, Wittinghofer A; Cell Rep. 2014;8:1-9. PMID:24981858