High-copy suppressor of mutant alleles of ATP-dependent RNA helicase DBP5, which is involved in mRNA export from the nucleus. It may also play an important role in a late stage of NAB2-mRNA export. Interacts with GLE1, NUP42, NAB2, ZDS1 and probably DBP5. Forms a complex with GLE1 and NAB2. Present with 2733 molecules/cell in log phase SD medium.