ABSTRACT
The nuclear import of proteins bearing a basic nuclear localization signal (NLS) is dependent on karyopherin α/importin α, which acts as the NLS receptor, and karyopherin β1/importin β, which binds karyopherin α and mediates the nuclear import of the resultant ternary complex. Recently, a second nuclear import pathway that allows the rapid reentry into the nucleus of proteins that participate in the nuclear export of mature mRNAs has been identified. In mammalian cells, a single NLS specific for this alternate pathway, the M9 NLS of heterogeneous nuclear ribonucleoprotein A1 (hnRNPA1), has been described. The M9 NLS binds a transport factor related to karyopherin β1, termed karyopherin β2 or transportin, and does not require a karyopherin α-like adapter protein. A yeast homolog of karyopherin β2, termed Kap104p, has also been described and proposed to play a role in the nuclear import of a yeast hnRNP-like protein termed Nab2p. Here, we define a Nab2p sequence that binds to Kap104p and that functions as an NLS in both human and yeast cells despite lacking any evident similarity to basic or M9 NLSs. Using an in vitro nuclear import assay, we demonstrate that Kap104p can direct the import into isolated human cell nuclei of a substrate containing a wild-type, but not a defective mutant, Nab2p NLS. In contrast, other NLSs, including the M9 NLS, could not function as substrates for Kap104p. Surprisingly, this in vitro assay also revealed that human karyopherin β1, but not the Kap104p homolog karyopherin β2, could direct the efficient nuclear import of a Nab2p NLS substrate in vitro in the absence of karyopherin α. These data therefore identify a novel NLS sequence, active in both yeast and mammalian cells, that is functionally distinct from both basic and M9 NLS sequences.
An epitope on Ki antigen recognized by autoantibodies from lupus patients shows homology with the sv40 large t antigen nuclear localization signal
