This domain family is found in eukaryotes, and is typically between 91 and 105 amino acids in length. This family is the N terminal of Ipi1, a component of the Rix1 complex which works in conjunction with Rea1 to mature the 60S ribosome.

1: Rea1, a dynein-related nuclear AAA-ATPase, is involved in late rRNA processing and nuclear export of 60 S subunits. Galani K, Nissan TA, Petfalski E, Tollervey D, Hurt E; J Biol Chem. 2004;279:55411-55418. PMID:15528184