Nucleoporin levels regulate cell cycle progression and phase-specific gene expression.

Nucleoporin levels regulate cell cycle progression and phase-specific gene expression.
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核孔蛋白水平调节细胞周期进程和阶段特异性基因表达。

DOI:
10.1016/j.devcel.2008.08.020
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发表时间:
2008-11
期刊:
影响因子:
11.8
通讯作者:
Fontoura, Beatriz M. A.
Fontoura, Beatriz M. A.
中科院分区:
生物学1区
文献类型:
--
作者:
Chakraborty, Papia;Wang, Yaming;Wei, Jen-Hsuan;van Deursen, Jan;Yu, Hongtao;Malureanu, Liviu;Dasso, Mary;Forbes, Douglass J.;Levy, David E.;Seemann, Joachim;Fontoura, Beatriz M. A.

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The Nup107-160 complex, the largest subunit of the nuclear pore, is multifunctional. It mediates mRNA export in interphase, and has roles in kinetochore function, spindle assembly, and postmitotic nuclear pore assembly. We report here that the levels of constituents of the Nup107-160 complex are coordinately cell cycle-regulated. At mitosis, however, a member of the complex, Nup96, is preferentially downregulated. This occurs via the ubiquitin-proteasome pathway. When the levels of Nup96 are kept high, a significant delay in G1/S progression occurs. Conversely, in cells of Nup96+/− mice, which express low levels of Nup96, cell cycle progression is accelerated. These lowered levels of Nup96 yield specific defects in nuclear export of certain mRNAs and protein expression, among which are key cell cycle regulators. Thus, Nup96 levels regulate differential gene expression in a phase-specific manner, setting the stage for proper cell cycle progression.
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