The nuclear pore complex (NPC) constitutes the sole gateway for bidirectional nucleocytoplasmic transport. NPCs are formed by multiple copies of 34 distinct proteins, termed nucleoporins (nups). In yeast, the channel nups Nsp1, Nup49, and Nup57 constitute part of the central transport channel and form the diffusion barrier with their disordered phenylalanine-glycine (FG) repeats. Structural studies of yeast Nup57 indicate that it contains left-handed coiled-coil domains (CCD1-3). This entry represents the third CCD located at the C-terminal region of Nup57 which is composed of five heptad repeats. Nup57 in yeast is the equivalent to human Nup54 Pfam:PF13874 [1].

1: Architecture of the fungal nuclear pore inner ring complex. Stuwe T, Bley CJ, Thierbach K, Petrovic S, Schilbach S, Mayo DJ, Perriches T, Rundlet EJ, Jeon YE, Collins LN, Huber FM, Lin DH, Paduch M, Koide A, Lu V, Fischer J, Hurt E, Koide S, Kossiakoff AA, Hoelz A; Science. 2015;350:56-64. PMID:26316600