NUP98 Sets the Size-Exclusion Diffusion Limit through the Ciliary Base.
NUP98 Sets the Size-Exclusion Diffusion Limit through the Ciliary Base.
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DOI:
10.1016/j.cub.2018.04.014
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发表时间:
2018-05-21
期刊:
影响因子:
--
通讯作者:
Brueckner M
中科院分区:
文献类型:
--
作者:
Endicott SJ;Brueckner M
The primary cilium maintains a well-regulated complement of soluble and membrane proteins, allowing it to mediate a variety of signaling pathways essential for development and tissue homeostasis. Entry into the cilium is regulated at the base, where a complex containing nucleoporins, referred to as the “ciliary pore complex,” (CPC) has been proposed to set a size-exclusion limit for soluble molecule diffusion into the cilium. Here, using a fluorescence-based diffusion trap system, we demonstrate that Nup98, a component of the FG hydrogel permeability barrier at the nuclear pore complex, limits the diffusion of soluble molecules >70kDa into the cilium in cultured mammalian cells. siRNA mediated knockdown of Nup98 increases the rate of diffusion of molecules >100kDa into the cilium. The tubulin heterodimer, the building block of the axoneme, is approximately 100kDa in size. After knockdown of Nup98, cilia become shorter, and their length is more sensitive to changes in cytoplasmic soluble tubulin levels. These data indicate a novel function of the ciliary pore complex, limiting diffusion of soluble tubulin between the ciliary matrix and the cytosol, allowing the cilium to regulate its length independently of cytosolic microtubule dynamics. Endicott and Brueckner show that the FG-repeat containing nucleoporin Nup98 localizes to the ciliary base, where it functions as part of a diffusion barrier limiting diffusion of molecules >70kDa, notably including tubulin, between the ciliary matrix and cytosol.
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