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- W2004887075 abstract "Small GTPases share a biochemical mechanism and act as binary molecular switches. One important function of small GTPases in the cell is nucleocytoplasmic transport of both proteins and RNA. Here, we show the stable association of human GPN1 and GPN3, small GTPases related to Ran, with RNA polymerase II (RNAPII) isolated from either the cytoplasmic or nuclear fraction. GPN1 and GPN3 directly interact with RNAPII subunit 7 (RPB7)/RPB4 and the C-terminal domain (CTD) of RNAPII. Depletion of GPN1 or GPN3 using small interfering RNAs led to decreased RNAPII levels in the nucleus and an accumulation of this enzyme in the cytoplasm of human cells. Furthermore, isolation of a GPN1/GPN3/RNAPII complex from stable cell lines expressing a dominant negative GPN1 harboring mutations in the GTP-binding pocket demonstrated a role for these proteins in nuclear import of RNAPII. Thus, GPN1/GPN3 define a new family of small GTPases that are specialized for the transport of RNA polymerase II into the nucleus." @default.
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- W2004887075 date "2011-10-01" @default.
- W2004887075 modified "2023-10-13" @default.
- W2004887075 title "Human GTPases Associate with RNA Polymerase II To Mediate Its Nuclear Import" @default.
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- W2004887075 doi "https://doi.org/10.1128/mcb.05442-11" @default.
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