Plakophilin 1 stimulates translation by promoting eIF4A1 activity.
Plakophilin 1 stimulates translation by promoting eIF4A1 activity.
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DOI:
10.1083/jcb.200908135
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发表时间:
2010-02-22
期刊:
影响因子:
--
通讯作者:
Hatzfeld M
中科院分区:
文献类型:
--
作者:
Wolf A;Krause-Gruszczynska M;Birkenmeier O;Ostareck-Lederer A;Hüttelmaier S;Hatzfeld M
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.
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影响因子:
4.3
作者:
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通讯作者:
Hatzfeld, Mechthild
影响因子:
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作者:
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影响因子:
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作者:
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通讯作者:
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影响因子:
3.3
作者:
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通讯作者:
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DOI:
10.1016/j.biocel.2007.10.023
发表时间:
2008
影响因子:
4
作者:
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通讯作者:
Roberts, Lisa O.