Proteins containing this domain are components of the nuclear pore complex [1]. One member of this family is Nucleoporin POM34 (Swiss: Q12445) which is thought to have a role in anchoring peripheral Nups into the pore and mediating pore formation [1].

1: Peering through the pore: nuclear pore complex structure, assembly, and function. Suntharalingam M, Wente SR; Dev Cell 2003;4:775-789. PMID:12791264