U3 snoRNA is ubiquitous in eukaryotes and is required for nucleolar processing of pre-18S ribosomal RNA [1]. It is a component of the ribosomal small subunit (SSU) processome. UTP15 is needed for optimal pre-ribosomal RNA transcription by RNA polymerase I, together with a subset of U3 proteins required for transcription (t-UTPs) [2]. This entry represents the C terminal of UTP15, and is found adjacent to WD40 repeats (Pfam:PF00400).

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

2: RNA polymerase I transcription and pre-rRNA processing are linked by specific SSU processome components. Gallagher JE, Dunbar DA, Granneman S, Mitchell BM, Osheim Y, Beyer AL, Baserga SJ; Genes Dev. 2004;18:2506-2517. PMID:15489292