This family represents the M-phase phosphoprotein 6 (MPP6) which is involved in the generation of the 3' end of the 5.8S rRNA precursor [1]. MPP6 is required for the integrity maintenance of the rRNA processing complex as it mediates the interaction between MTR4 (RNA helicase) and RRP6 (an 3'-5' exonuclease), and the recruitment of Nuclear VCP-like 2 (NVL2) to the nuclear exosome [2].

1: MPP6 is an exosome-associated RNA-binding protein involved in 5.8S rRNA maturation. Schilders G, Raijmakers R, Raats JM, Pruijn GJ; Nucleic Acids Res. 2005;33:6795-6804. PMID:16396833

2: NVL2, a nucleolar AAA-ATPase, is associated with the nuclear exosome and is involved in pre-rRNA processing. Yoshikatsu Y, Ishida Y, Sudo H, Yuasa K, Tsuji A, Nagahama M; Biochem Biophys Res Commun. 2015;464:780-786. PMID:26166824