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Biochem Biophys Res Commun. 2014 Mar 14;445(3):639-44. doi: 10.1016/j.bbrc.2014.02.063. Epub 2014 Feb 22.

The processed isoform of the translation termination factor eRF3 localizes to the nucleus to interact with the ARF tumor suppressor.

Author information

1
Department of Biological Chemistry, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya 467-8603, Japan.
2
Department of Biological Chemistry, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya 467-8603, Japan. Electronic address: hoshino@phar.nagoya-cu.ac.jp.

Abstract

The eukaryotic releasing factor eRF3 is a multifunctional protein that plays pivotal roles in translation termination as well as the initiation of mRNA decay. eRF3 also functions in the regulation of apoptosis; eRF3 is cleaved at Ala73 by an as yet unidentified protease into processed isoform of eRF3 (p-eRF3), which interacts with the inhibitors of apoptosis proteins (IAPs). The binding of p-eRF3 with IAPs leads to the release of active caspases from IAPs, which promotes apoptosis. Although full-length eRF3 is localized exclusively in the cytoplasm, p-eRF3 localizes in the nucleus as well as the cytoplasm. We here focused on the role of p-eRF3 in the nucleus. We identified leptomycin-sensitive nuclear export signal (NES) at amino acid residues 61-71 immediately upstream of the cleavage site Ala73. Thus, the proteolytic cleavage of eRF3 into p-eRF3 leads to release an amino-terminal fragment containing NES to allow the relocalization of eRF3 into the nucleus. Consistent with this, p-eRF3 more strongly interacted with the nuclear ARF tumor suppressor than full-length eRF3. These results suggest that while p-eRF3 interacts with IAPs to promote apoptosis in the cytoplasm, p-eRF3 also has some roles in regulating cell death in the nucleus.

KEYWORDS:

ARF; Apoptosis; IAP; NES; Translation termination; eRF3

PMID:
24569073
DOI:
10.1016/j.bbrc.2014.02.063
[Indexed for MEDLINE]

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