This domain is found in lethal giant larvae homolog 2 (LLGL2) proteins and syntaxin-binding proteins like tomosyn [1]. It has been identified in eukaryotes and tends to be found together with WD repeats (Pfam:PF00400).

1: Identification and characterization of human LLGL4 gene and mouse Llgl4 gene in silico. Katoh M, Katoh M; Int J Oncol 2004;24:737-742. PMID:14767561