This is a domain of unknown function. Family members found in Saccharomyces cerevisiae, are synthetic lethal with genes involved in maintenance of telomere capping [1, 2]. However, experimental evidence is yet to verify the exact function of family members and the domain.

1: Systematic identification and functional screens of uncharacterized proteins associated with eukaryotic ribosomal complexes. Fleischer TC, Weaver CM, McAfee KJ, Jennings JL, Link AJ; Genes Dev. 2006;20:1294-1307. PMID:16702403

2: A genomewide suppressor and enhancer analysis of cdc13-1 reveals varied cellular processes influencing telomere capping in Saccharomyces cerevisiae. Addinall SG, Downey M, Yu M, Zubko MK, Dewar J, Leake A, Hallinan J, Shaw O, James K, Wilkinson DJ, Wipat A, Durocher D, Lydall D; Genetics. 2008;180:2251-2266. PMID:18845848