Importin 13 has a spiralic structure containing repeats structurally similar to HEAT repeats [1,3]. It serves as receptor for nuclear localization signals (NLS) in cargo substrates [2], mediating docking of the importin/substrate complex to the nuclear pore complex (NPC). It contains several repeats structurally similar to the HEAT repeat [3]. This Pfam entry represents a single repeat unit.

1: Structural basis for the nuclear export activity of Importin13. Grunwald M, Lazzaretti D, Bono F; EMBO J. 2013;32:899-913. PMID:23435562

2: Extensive Identification and In-depth Validation of Importin 13 Cargoes. Baade I, Spillner C, Schmitt K, Valerius O, Kehlenbach RH; Mol Cell Proteomics. 2018;17:1337-1353. PMID:29666159

3: Nuclear import mechanism of the EJC component Mago-Y14 revealed by structural studies of importin 13. Bono F, Cook AG, Grunwald M, Ebert J, Conti E; Mol Cell. 2010;37:211-222. PMID:20122403