Chromosome region maintenance 1 / Exportin 1 mediates the nuclear transport of proteins bearing a leucin-rich nuclear export signal (NES). It contains helical repeats [1] that are structurally similar to HEAT repeats, but share little sequence similarity with them [2]. N-, C-terminal and central repeats show slightly different structural arrangements, with N- and C- terminal repeats interacting with each other. This Pfam entry includes some CRM1 repeats that fail to be detected with the PF18777 model.

1: Structural basis for cooperativity of CRM1 export complex formation. Monecke T, Haselbach D, Voss B, Russek A, Neumann P, Thomson E, Hurt E, Zachariae U, Stark H, Grubmuller H, Dickmanns A, Ficner R; Proc Natl Acad Sci U S A. 2013;110:960-965. PMID:23277578

2: Architecture of CRM1/Exportin1 suggests how cooperativity is achieved during formation of a nuclear export complex. Petosa C, Schoehn G, Askjaer P, Bauer U, Moulin M, Steuerwald U, Soler-Lopez M, Baudin F, Mattaj IW, Muller CW; Mol Cell. 2004;16:761-775. PMID:15574331