Ectopic expression of eIF4E-transporter triggers the movement of eIF4E into P-bodies, inhibiting steady-state translation but not the pioneer round of translation

Hyung Chul Lee, Hana Cho, Yoon Ki Kim

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Nonsense-mediated mRNA decay (NMD) is the best-characterized mRNA surveillance mechanism; this process removes faulty mRNAs harboring premature termination codons (PTCs). NMD targets newly synthesized mRNAs bound by nuclear cap-binding proteins 80/20 (CBP80/20) and exon junction complex (EJC), the former of which is thought to recruit the ribosome to initiate the pioneer round of translation. After completion of the pioneer round of translation, CBP80/20 is replaced by the cytoplasmic cap-binding protein eIF4E, which mediates steady-state translation in the cytoplasm. Here, we show that overexpression of eIF4E-T preferentially inhibits cap-dependent steady-state translation, but not the pioneer round of translation. We also demonstrate that overexpression of eIF4E-T or Dcp1a triggers the movement of eIF4E into the processing bodies. These results suggest that the pioneer round of translation differs from steady-state translation in terms of ribosome recruitment.

Original languageEnglish
Pages (from-to)1160-1165
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume369
Issue number4
DOIs
Publication statusPublished - 2008 May 16

Keywords

  • CBP80
  • eIF4E
  • eIF4E-T
  • Internal ribosome entry site
  • Nonsense-mediated mRNA decay
  • Processing bodies
  • Steady-state translation
  • The pioneer round of translation

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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