Two distinct classes of Ran-binding sites on the nucleoporin Nup-358.

Two distinct classes of Ran-binding sites on the nucleoporin Nup-358.
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核孔蛋白 Nup-358 上有两类不同的 Ran 结合位点。

DOI:
10.1073/pnas.96.10.5516
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发表时间:
1999
影响因子:
11.1
通讯作者:
Blobel,G
Blobel,G
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Yaseen,NR;Blobel,G

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NUP-358是一种位于核孔复合体(NPC)胞质纤维顶端的巨型核孔蛋白。它包含4个RBH(RanBP1同源)结构域和一个带有8个锌指基序的锌指结构域。利用Nup-358的两个RBH结构域和两个锌指结构域的三个重组片段,我们在体外证明了RanGDP和RanGTP都与Nup-358结合。RBH结构域与RanGDP或RanGTP结合。有趣的是,锌指结构域被发现只与RanGDP结合。EDTA处理的锌螯合作用取消了RanGDP与锌指结构域的结合,而不影响RAN与RBH结构域的结合。用RanGDP标记的胶体金在洋地黄素通透性细胞中的超微结构研究表明,鼻咽癌的细胞质纤维上有大量的Ran结合位点。其中,只有更靠近鼻咽癌中轴的部分对RanBP1竞争敏感,这表明Nup-358的大部分RBH结构域比锌指结构域更靠近鼻咽癌中轴。因此,Nup-358的RBH结构域和锌指结构域被鉴定为两类不同的Ran结合部位,在NPC具有不同的超微结构位置。
Nup-358 is a giant nucleoporin located at the tips of the cytoplasmic fibrils of the nuclear pore complex (NPC). Its contains four RBH (RanBP1-homologous) domains and a zinc finger domain with eight zinc finger motifs. Using three recombinant fragments of Nup-358 that comprise two of the RBH domains and the zinc finger domain, we show that both RanGDP and RanGTP bind to Nup-358in vitro. The RBH domains bound either RanGDP or RanGTP. Interestingly, the zinc finger domain was found to bind RanGDP exclusively. Zinc chelation by EDTA treatment abolished the binding of RanGDP to the zinc finger domain without affecting the binding of Ran to the RBH domain. Ultrastructural studies with RanGDP-conjugated colloidal gold in digitonin-permeabilized cells showed a large number of Ran-binding sites on the cytoplasmic fibrils of the NPC. Of those, only a portion that is closer to the central axis of the NPC was sensitive to RanBP1 competition, suggesting that most of the RBH domains of Nup-358 are situated closer to the central axis of the NPC than the zinc finger domain. Thus, the RBH and the zinc finger domains of Nup-358 were identified as two different classes of Ran-binding sites with distinct, ultrastructural locations at the NPC.
DOI: 10.1016/0162-0134(89)84572-6
发表时间: 1989-05
影响因子: 11.1
作者:
Tao Pan;JosephE. Coleman
通讯作者: Tao Pan;JosephE. Coleman
DOI: 10.1016/s0960-9822(98)70239-8
发表时间: 1998-05-21
期刊: CURRENT BIOLOGY
影响因子: 9.2
作者:
Cole, CN;Hammell, CM
通讯作者: Hammell, CM
DOI: 10.1073/pnas.91.21.10212
发表时间: 1994-10-11
影响因子: 11.1
作者:
MOORE, MS;BLOBEL, G
通讯作者: BLOBEL, G
DOI: 10.1016/0092-8674(95)90181-7
发表时间: 1995-12-01
期刊: CELL
影响因子: 64.5
作者:
REXACH, M;BLOBEL, G
通讯作者: BLOBEL, G
DOI: 10.1038/366585a0
发表时间: 1993-12-09
期刊: NATURE
影响因子: 64.8
作者:
COUTAVAS, E;REN, MD;RUSH, MG
通讯作者: RUSH, MG