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- W2000424598 abstract "The cytosolic nuclear transport factor p10/NTF2 is required for the translocation of karyophilic molecules through nuclear pores [1] [2] [3], and the small GTPase Ran is a key regulator of protein transport between the nucleus and cytoplasm [4] [5]. It has been reported that p10/NTF2 interacts directly and specifically with Ran-GDP but not with Ran-GTP [6]. The precise role(s) of p10/NTF2 in the Ran GTP/GDP cycle are thus far unclear, however. In this study, we show that mammalian p10/NTF2 dramatically inhibits the dissociation of [3H]GDP from Ran and the binding of [35S]GTPgammaS to Ran following the dissociation of non-radioactive GDP by RCC1, the only known mammalian guanine nucleotide exchange factor for Ran (Ran-GEF) [7]. In contrast, the dissociation of [35S]GTP gamma S from Ran, which was also catalyzed by RCC1, was not affected by p10/NTF2. Furthermore, the activities of wild-type p10/NTF2 and the mutant forms M84T and D92G in an assay of nuclear protein import in a digitonin-permeabilized cell-free system correlated with their level of inhibition of the dissociation of nucleotide from Ran-GDP. These results suggest that p10/NTF2 acts as a GDP dissociation inhibitor for Ran (Ran-GDI), thereby coordinating the Ran-dependent reactions that underlie nuclear protein import." @default.
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- W2000424598 title "Nuclear transport factor p10/NTF2 functions as a Ran–GDP dissociation inhibitor (Ran-GDI)" @default.
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- W2000424598 doi "https://doi.org/10.1016/s0960-9822(07)00566-0" @default.
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