1999年8月
Caspase-mediated cleavage of eukaryotic translation initiation factor subunit 2 alpha
BIOCHEMICAL JOURNAL
- ,
- ,
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- 巻
- 342
- 号
- 開始ページ
- 65
- 終了ページ
- 70
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1042/0264-6021:3420065
- 出版者・発行元
- PORTLAND PRESS
Eukaryotic translation initiation factor 2 alpha (eIF-2 alpha), a target molecule of the interferon-inducible double-stranded-RNA-dependent protein kinase (PKR), was cleaved in apoptotic Saos-2 cells on treatment with poly(I).poly(C) or tumour necrosis factor alpha. This cleavage occurred with a time course similar to that of poly(ADP-ribose) polymerase, a well-known caspase substrate. In addition, eIF-2 alpha was cleaved by recombinant active caspase-3 in vitro. By site-directed mutagenesis, the cleavage site was mapped to an Ala-Glu-Val-Asp(300) down arrow Gly(301) sequence located in the C-terminal portion of eIF-2 alpha. PKR phosphorylates eIF-2 alpha on Ser(51), resulting in the suppression of protein synthesis. PKR-mediated translational suppression was repressed when the C-terminally cleaved product of eIF-2 alpha was overexpressed in Saos-2 cells, even though PKR can phosphorylate this cleaved product. These results suggest that caspase-3 or related protease(s) can modulate the efficiency of protein synthesis by cleaving the a subunit of eIF-2, a key component in the initiation of translation.
- リンク情報
- ID情報
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- DOI : 10.1042/0264-6021:3420065
- ISSN : 0264-6021
- J-Global ID : 200902142378564450
- Web of Science ID : WOS:000082261200010