This domain is found at the C-terminus of proteins containing WD40 repeats. These proteins are part of the U3 ribonucleoprotein the yeast protein is called Utp12 or DIP2 Swiss:Q12220 [1].

1: A large nucleolar U3 ribonucleoprotein required for 18S ribosomal RNA biogenesis. Dragon F, Gallagher JE, Compagnone-Post PA, Mitchell BM, Porwancher KA, Wehner KA, Wormsley S, Settlage RE, Shabanowitz J, Osheim Y, Beyer AL, Hunt DF, Baserga SJ; Nature 2002;0:0-0. PMID:12068309