共 64 条
Arabidopsis eIF3e is regulated by the COP9 signalosome and has an impact on development and protein translation
被引:37
作者:

Yahalom, Avital
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机构:
Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel

Kim, Tae-Houn
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h-index: 0
机构:
Univ Tennessee, Dept Biochem Cellular & Mol Biol, Knoxville, TN 37996 USA Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel

Roy, Bijoyita
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h-index: 0
机构:
Univ Tennessee, Dept Biochem Cellular & Mol Biol, Knoxville, TN 37996 USA Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel

Singer, Ruth
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机构:
Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel

Von Arnim, Albrecht G.
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机构:
Univ Tennessee, Dept Biochem Cellular & Mol Biol, Knoxville, TN 37996 USA Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel

Chamovitz, Daniel A.
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机构:
Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel
机构:
[1] Tel Aviv Univ, Dept Plant Sci, IL-69978 Tel Aviv, Israel
[2] Univ Tennessee, Dept Biochem Cellular & Mol Biol, Knoxville, TN 37996 USA
关键词:
COP9;
signalosome;
eIF3;
Int-6/Int6;
protein translation;
D O I:
10.1111/j.1365-313X.2007.03347.x
中图分类号:
Q94 [植物学];
学科分类号:
071001 ;
摘要:
The roles of individual eukaryotic translation initiation factor 3 (eIF3) subunits are largely unclear, although some are essential, while others are thought to have regulatory roles. The 'e' subunit, also known as Int-6/Int6, is a candidate for a regulatory subunit as it is not essential for translation initiation in yeasts. eIF3e associates with the COP9 signalosome, and localizes to the nucleus in certain tissues. To further elucidate the roles of eIF3e, we have taken a genetic approach using Arabidopsis as a model system. Overexpression of eIF3e results in defects similar to mutations in the COP9 signalosome. eIF3e protein, but not transcript, over accumulates in csn mutants, and eIF3e is degraded in a proteasome-dependent fashion. In vitro and in vivo assays suggest that excess eIF3e inhibits translation. We conclude that the COP9 signalosome maintains a precise regulation of eIF3e levels, which is necessary for normal development in Arabidopsis.
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页码:300 / 311
页数:12
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