This entry includes NOPCHAP1 from animals and New4 from fission yeast. NOPCHAP1 is a client-loading PAQosome/R2TP complex cofactor that selects NOP58 to promote box C/D small nucleolar ribonucleoprotein (snoRNP) assembly [1]. The function of New4 is not clear.

1: NOPCHAP1 is a PAQosome cofactor that helps loading NOP58 on RUVBL1/2 during box C/D snoRNP biogenesis. Abel Y, Paiva ACF, Bizarro J, Chagot ME, Santo PE, Robert MC, Quinternet M, Vandermoere F, Sousa PMF, Fort P, Charpentier B, Manival X, Bandeiras TM, Bertrand E, Verheggen C; Nucleic Acids Res. 2021;49:1094-1113. PMID:33367824