Structural component of 3 complexes%3B subunit of the Nup84p nuclear pore subcomplex that contributes to nucleocytoplasmic transport and NPC biogenesis%3B subunit of the COPII vesicle coat required for ER-to-Golgi transport%3B subunit of SEACAT%2C a subcomplex of the coatomer-related%2C vacuolar-associated SEA complex%2C that inhibits the TORC1 inhibitory role of SEACIT (Iml1p-Npr2p-Npr3p)%2C a GAP for Gtr1p%2C thereby resulting in activation of TORC1 signaling%3B human SEC13 homolog