This family of proteins represents the N-terminal domain of replication protein A (RPA) interacting protein. RPA interacting protein is involved in the import of RPA into the nucleus. The N-terminal domain is responsible for interaction with importin beta [1-2].

1: Nuclear import of RPA in Xenopus egg extracts requires a novel protein XRIPalpha\tbut not importin alpha. Jullien D, Gorlich D, Laemmli UK, Adachi Y; EMBO J. 1999;18:4348-4358. PMID:10428972

2: Sumoylation of the novel protein hRIP{beta} is involved in replication protein A deposition in PML nuclear bodies. Park J, Seo T, Kim H, Choe J; Mol Cell Biol. 2005;25:8202-8214. PMID:16135809