Exuperantia (Exu) is associated with localization of bicoid (bcd) mRNA and required for its localization at the anterior pole of the oocyte. Crystal structure of Exu reveals a dimeric assembly with each monomer consisting of a 3'-5' EXO-like domain and a sterile alpha motif (SAM)-like domain. The SAM-like domain interacts with its target RNA as a homodimer and is required for RNA binding activity [1].

1: The bicoid mRNA localization factor Exuperantia is an RNA-binding pseudonuclease. Lazzaretti D, Veith K, Kramer K, Basquin C, Urlaub H, Irion U, Bono F; Nat Struct Mol Biol. 2016;23:705-713. PMID:27376588