The sequences featured in this family are similar to a region close to the N-terminus of yeast exportin 1 (Xpo1, Crm1, Swiss:P14068). This region is found just C-terminal to an importin-beta N-terminal domain (Pfam:PF03810) in many members of this family. Exportin 1 is a nuclear export receptor that interacts with leucine-rich nuclear export signal (NES) sequences, and Ran-GTP, and is involved in translocation of proteins out of the nucleus [1,2].

1: Exportin 1 (Crm1p) is an essential nuclear export factor. Stade K, Ford CS, Guthrie C, Weis K; Cell 1997;90:1041-1050. PMID:9323132

2: Nuclear export receptors: from importin to exportin. Ullman KS, Powers MA, Forbes DJ; Cell 1997;90:967-970. PMID:9323123