This nucleolar family of proteins are involved in 60S ribosomal biogenesis. They are specifically involved in the processing beyond the 27S stage of 25S rRNA maturation [3]. This family contains sequences that bear similarity to the glioma tumour suppressor candidate region gene 2 protein (p60) [1]. This protein has been found to interact with herpes simplex type 1 regulatory proteins [1].

1: A transcript map of the chromosome 19q-arm glioma tumor suppressor region. Smith JS, Tachibana I, Pohl U, Lee HK, Thanarajasingam U, Portier BP, Ueki K, Ramaswamy S, Billings SJ, Mohrenweiser HW, Louis DN, Jenkins RB; Genomics 2000;64:44-50. PMID:10708517

2: A novel cellular protein, p60, interacting with both herpes simplex virus 1 regulatory proteins ICP22 and ICP0 is modified in a cell-type-specific manner and Is recruited to the nucleus after infection. Bruni R, Fineschi B, Ogle WO, Roizman B; J Virol 1999;73:3810-3817. PMID:10196275

3: Nop53p is a novel nucleolar 60S ribosomal biogenesis protein. Sydorskyy Y, Dilworth DJ, Halloran BP, Yi EC, Makhnevych TR, Wozniak RW, Aitchison JD; Biochem J 2005; [Epub ahead of print] PMID:15686447