A role for the eIF4E-binding protein 4E-T in P-body formation and mRNA decay.

A role for the eIF4E-binding protein 4E-T in P-body formation and mRNA decay.
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DOI:
10.1083/jcb.200504039
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发表时间:
2005-09-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Sonenberg N
Sonenberg N
中科院分区:
其他
文献类型:
--
作者:
Ferraiuolo MA;Basak S;Dostie J;Murray EL;Schoenberg DR;Sonenberg N

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4E - 转运蛋白(4E - T)是通过一个保守的结合基序与mRNA 5′帽结合蛋白、真核起始因子4E(eIF4E)结合的几种蛋白质之一。我们先前表明4E - T是一种核质穿梭蛋白,它介导eIF4E进入细胞核。在稳态下,4E - T主要存在于细胞质中,并集中在与最近描述的加工体(P - 体)非常相似的小体中,加工体被认为是mRNA降解的位点。在本文中,我们证明4E - T与真正的P - 体中的mRNA脱帽因子共定位。此外,4E - T控制mRNA的半衰期,因为使用小干扰RNA将其从细胞中去除会增加mRNA的稳定性。4E - T的结合伙伴eIF4E也定位于P - 体中。4E - T与eIF4E的相互作用抑制翻译,这被认为是mRNA靶向P - 体的先决条件。总之,这些数据表明4E - T与eIF4E的相互作用是诱导信使核糖核蛋白重排以及从翻译到降解转变的起始事件。
4E-transporter (4E-T) is one of several proteins that bind the mRNA 5′cap-binding protein, eukaryotic initiation factor 4E (eIF4E), through a conserved binding motif. We previously showed that 4E-T is a nucleocytoplasmic shuttling protein, which mediates the import of eIF4E into the nucleus. At steady state, 4E-T is predominantly cytoplasmic and is concentrated in bodies that conspicuously resemble the recently described processing bodies (P-bodies), which are believed to be sites of mRNA decay. In this paper, we demonstrate that 4E-T colocalizes with mRNA decapping factors in bona fide P-bodies. Moreover, 4E-T controls mRNA half-life, because its depletion from cells using short interfering RNA increases mRNA stability. The 4E-T binding partner, eIF4E, also is localized in P-bodies. 4E-T interaction with eIF4E represses translation, which is believed to be a prerequisite for targeting of mRNAs to P-bodies. Collectively, these data suggest that 4E-T interaction with eIF4E is a priming event in inducing messenger ribonucleoprotein rearrangement and transition from translation to decay.
核真核起始因子 4E (eIF4E) 与斑点中的剪接因子共定位。
DOI: 10.1083/jcb.148.2.239
发表时间: 2000-01-24
影响因子: 7.8
作者:
Dostie, J;Lejbkowicz, F;Sonenberg, N
通讯作者: Sonenberg, N
DOI: 10.1083/jcb.136.4.761
发表时间: 1997-02-24
期刊: The Journal of cell biology
影响因子: --
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发表时间: 1999-10-15
期刊: EMBO JOURNAL
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DOI: 10.1073/pnas.0400933101
发表时间: 2004-03-23
影响因子: 11.1
作者:
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通讯作者: Sonenberg, N
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发表时间: 2003-10-01
期刊: RNA
影响因子: 4.5
作者:
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通讯作者: Fritzler, MJ