Plakophilin 1 stimulates translation by promoting eIF4A1 activity.

Plakophilin 1 stimulates translation by promoting eIF4A1 activity.
复制标题

DOI:
10.1083/jcb.200908135
复制
发表时间:
2010-02-22
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Hatzfeld M
Hatzfeld M
中科院分区:
其他
文献类型:
--
作者:
Wolf A;Krause-Gruszczynska M;Birkenmeier O;Ostareck-Lederer A;Hüttelmaier S;Hatzfeld M

文献摘要

参考文献

被引文献

相似文献

p120 犰狳蛋白 plakophilin 1 与真核翻译因子 eIF4A1 结合,将其招募到帽结合复合物中并刺激翻译。 Plakophilins 1-3 (PKP1-3) 是犰狳相关蛋白 p120ctn 家族的桥粒蛋白,对于组织桥粒斑块至关重要。最近的研究结果在应激颗粒中发现了 PKP,这表明它与翻译机制有关。然而,迄今为止,PKP 在控制翻译中的作用仍然难以捉摸。在这项研究中,我们证明了 PKP1 与真核翻译起始因子 4A1 (eIF4A1) 的直接关联。 PKP1 通过信使 RNA 帽和脑心肌炎病毒内部核糖体进入位点 (IRES) 结构刺激 eIF4A1 依赖性翻译,而通过丙型肝炎病毒 IRES 的 eIF4A1 独立翻译不受影响。 PKP1 与帽复合物中的 eIF4A1 共纯化,其过表达刺激 eIF4A1 募集到帽结合复合物中。在分子水平上,PKP1直接促进eIF4A1三磷酸腺苷酶活性。 PKP1 过表达时的翻译刺激与增殖和细胞大小的上调相关。总之,这些发现确定 PKP1 通过调节 eIF4A1 活性作为翻译和增殖的调节剂,并表明 PKP1 在生理和病理条件下控制细胞生长。
p120 armadillo protein plakophilin 1 binds to eukaryotic translation factor eIF4A1, recruiting it into cap-binding complexes and stimulating translation. Plakophilins 1–3 (PKP1–3) are desmosomal proteins of the p120ctn family of armadillo-related proteins that are essential for organizing the desmosomal plaque. Recent findings identified PKPs in stress granules, suggesting an association with the translational machinery. However, a role of PKPs in controlling translation remained elusive so far. In this study, we show a direct association of PKP1 with the eukaryotic translation initiation factor 4A1 (eIF4A1). PKP1 stimulated eIF4A1-dependent translation via messenger RNA cap and encephalomyocarditis virus internal ribosomal entry site (IRES) structures, whereas eIF4A1-independent translation via hepatitis C virus IRES was not affected. PKP1 copurified with eIF4A1 in the cap complex, and its overexpression stimulated eIF4A1 recruitment into cap-binding complexes. At the molecular level, PKP1 directly promoted eIF4A1 adenosine triphosphatase activity. The stimulation of translation upon PKP1 overexpression correlated with the up-regulation of proliferation and cell size. In conclusion, these findings identify PKP1 as a regulator of translation and proliferation via modulation of eIF4A1 activity and suggest that PKP1 controls cell growth in physiological and pathological conditions.
DOI: 10.4161/cc.6.2.3741
发表时间: 2007-01-15
期刊: CELL CYCLE
影响因子: 4.3
作者:
Keil, Rene;Wolf, Annika;Hatzfeld, Mechthild
通讯作者: Hatzfeld, Mechthild
DOI: 10.1083/jcb.149.1.209
发表时间: 2000-04-03
影响因子: 7.8
作者:
Hatzfeld, M;Haffner, C;Vinzens, U
通讯作者: Vinzens, U
DOI: 10.1074/jbc.m909464199
发表时间: 2000-06-09
影响因子: 4.8
作者:
Bi, XP;Goss, DJ
通讯作者: Goss, DJ
DOI: 10.1091/mbc.e05-08-0708
发表时间: 2006-03-01
影响因子: 3.3
作者:
Hofmann, I;Casella, M;Franke, WW
通讯作者: Franke, WW
DOI: 10.1016/j.biocel.2007.10.023
发表时间: 2008
影响因子: 4
作者:
Goodfellow, Ian G.;Roberts, Lisa O.
通讯作者: Roberts, Lisa O.