At least one member, Noc2p from yeast, is required for a late step in 60S subunit export from the nucleus [2]. It has also been shown to co-precipitate with Nug1p, a nuclear GTPase also required for ribosome nucleus export [1]. This family was formerly known as UPF0120.

1: Identification of a 60S preribosomal particle that is closely linked to nuclear export. Bassler J, Grandi P, Gadal O, Lessmann T, Petfalski E, Tollervey D, Lechner J, Hurt E; Mol Cell 2001;8:517-529. PMID:11583615

2: Maturation and intranuclear transport of pre-ribosomes requires Noc proteins. Milkereit P, Gadal O, Podtelejnikov A, Trumtel S, Gas N, Petfalski E, Tollervey D, Mann M, Hurt E, Tschochner H; Cell 2001;105:499-509. PMID:11371346