Functions in nuclear protein import as nuclear transport receptor. Serves as receptor for nuclear localization signals (NLS) in cargo substrates. Is thought to mediate docking of the importin/substrate complex to the nuclear pore complex (NPC) through binding to nucleoporin and the complex is subsequently translocated through the pore by an energy requiring, Ran-dependent mechanism. At the nucleoplasmic side of the NPC, Ran binds to the importin, the importin/substrate complex dissociates and importin is re-exported from the nucleus to the cytoplasm where GTP hydrolysis releases Ran. The directionality of nuclear import is thought to be conferred by an asymmetric distribution of the GTP- and GDP-bound forms of Ran between the cytoplasm and nucleus. Mediates the nuclear import of RPS7, RPL18A, RPL6, histone H2A, histone H2B and histone. Prevents the cytoplasmic aggregation of RPS7 and RPL18A by shielding exposed basic domains. Mediates the nuclear import of actin .
Background References
1. Qin C. et. al. RANBP9 suppresses tumor proliferation in colorectal cancer. Oncol Lett. 2019 May.
Western blot analysis of RanBP9 on different lysates. Proteins were transferred to a PVDF membrane and blocked with 5% BSA in PBS for 1 hour at room temperature. The primary antibody (ER2001-63, 1/500) was used in 5% BSA at room temperature for 2 hours. Goat Anti-Rabbit IgG - HRP Secondary Antibody (HA1001) at 1:5,000 dilution was used for 1 hour at room temperature. Positive control: Lane 1: SKBR-3 cell lysate Lane 2: 293 cell lysate Lane 3: Mouse lung tissue lysate Lane 4: Rat brain tissue lysate
Flow cytometric analysis of RanBP9 was done on F9 cells. The cells were fixed, permeabilized and stained with the primary antibody (ER2001-63, 1/50) (red). After incubation of the primary antibody at room temperature for an hour, the cells were stained with a Alexa Fluor 488-conjugated Goat anti-Rabbit IgG Secondary antibody at 1/1000 dilution for 30 minutes.Unlabelled sample was used as a control (cells without incubation with primary antibody; black).
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