This is a the N-terminal domain of the mammalian PIP30/FAM192A protein and the fungal Fyv6 protein. PIP30/FAM192A acts as a regulator PA28-gamma, a nuclear activator of the 20S proteasome. PIP30 favors PA28-gamma interaction with the 20S proteasome while inhibiting its association with coilin, a central component of nuclear Cajal bodies [1]. Fyv6 is involved in telomere length regulation and required for survival upon exposure to K1 killer toxin [2, 3]. It promotes fully efficient non-homologous end-joining (NHEJ) by a mechanism activated in postdiauxic/stationary phase [4].

1: PIP30/FAM192A is a novel regulator of the nuclear proteasome activator PA28gamma. Jonik-Nowak B, Menneteau T, Fesquet D, Baldin V, Bonne-Andrea C, Mechali F, Fabre B, Boisguerin P, de Rossi S, Henriquet C, Pugniere M, Ducoux-Petit M, Burlet-Schiltz O, Lamond AI, Fort P, Boulon S, Bousquet MP, Coux O; Proc Natl Acad Sci U S A. 2018;115:E6477. PMID:29934401

2: A Saccharomyces cerevisiae genome-wide mutant screen for altered sensitivity to K1 killer toxin. Page N, Gerard-Vincent M, Menard P, Beaulieu M, Azuma M, Dijkgraaf GJ, Li H, Marcoux J, Nguyen T, Dowse T, Sdicu AM, Bussey H; Genetics. 2003;163:875-894. PMID:12663529

3: Telomere length as a quantitative trait: genome-wide survey and genetic mapping of telomere length-control genes in yeast. Gatbonton T, Imbesi M, Nelson M, Akey JM, Ruderfer DM, Kruglyak L, Simon JA, Bedalov A; PLoS Genet. 2006;2:e35. PMID:16552446

4: A genomics-based screen for yeast mutants with an altered recombination/end-joining repair ratio. Wilson TE; Genetics. 2002;162:677-688. PMID:12399380