This domain is found in spliceosomal RNA helicase Brr2. Brr2 is required for the assembly of a catalytically active spliceosome on a messenger RNA precursor. The domain is found in the N-terminal region and is non-canonically PWI-like. The PWI-like domain is thought to be involved in protein-protein interactions [1].

1: A noncanonical PWI domain in the N-terminal helicase-associated region of the spliceosomal Brr2 protein. Absmeier E, Rosenberger L, Apelt L, Becke C, Santos KF, Stelzl U, Wahl MC; Acta Crystallogr D Biol Crystallogr. 2015;71:762-771. PMID:25849387