The yeast member of this family (Kri1p) is found to be required for 40S ribosome biogenesis in the nucleolus [1]. This is the C-terminal domain of the family.

1: Yeast Krr1p physically and functionally interacts with a novel essential Kri1p, and both proteins are required for 40S ribosome biogenesis in the nucleolus. Sasaki T, Toh-E A, Kikuchi Y; Mol Cell Biol 2000;20:7971-7979. PMID:11027267