Cited by 572RNA and protein synthesis mechanismsRNA Research and SplicingPI3K/AKT/mTOR signaling in cancer

A newly identified N‐terminal amino acid sequence of human eIF4G binds poly(A)‐binding protein and functions in poly(A)‐dependent translation

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Imataka, Hiroaki, Gradi, Alessandra, Sonenberg, Nahum·1998·The EMBO Journal

Abstract

Most eukaryotic mRNAs possess a 5' cap and a 3' poly(A) tail, both of which are required for efficient translation. In yeast and plants, binding of eIF4G to poly(A)-binding protein (PABP) was implicated in poly(A)-dependent translation. In mammals, however, there has been no evidence that eIF4G binds PABP. Using 5' rapid amplification of cDNA, we have extended the known human eIF4GI open reading frame from the N-terminus by 156 amino acids. Co-immunoprecipitation experiments showed that the extended eIF4GI binds PABP, while the N-terminally truncated original eIF4GI cannot. Deletion analysis identified a 29 amino acid sequence in the new N-terminal region as the PABP-binding site. The 29 amino acid stretch is almost identical in eIF4GI and eIF4GII, and the full-length eIF4GII also binds PABP. As previously shown for yeast, human eIF4G binds to a fragment composed of RRM1 and RRM2 of PABP. In an in vitro translation system, an N-terminal fragment which includes the PABP-binding site inhibits poly(A)-dependent translation, but has no effect on translation of a deadenylated mRNA. These results indicate that, in addition to a recently identified mammalian PABP-binding protein, PAIP-1, eIF4G binds PABP and probably functions in poly(A)-dependent translation in mammalian cells.

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Crossref · 10.1093/emboj/17.24.7480

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Authors
Imataka, H., Gradi, A., & Sonenberg, N.
Affiliations
McGill University (CA)
Corresponding author
Sonenberg, Nahum
Venue
The EMBO Journal
Published
1998-12-15
Volume
17
Issue
24
Pages
7480-7489
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W2102754190
Cited by
572
References
41
Citations by year
2026: 6 · 2025: 10 · 2024: 14 · 2023: 8 · 2022: 9 · 2021: 9 · 2020: 13 · 2019: 13 · 2018: 17 · 2017: 17 · 2016: 16 · 2015: 8 · 2014: 30 · 2013: 20 · 2012: 16
FWCI
13.95
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
Keywords
eIF4G, poly(A)-binding protein, N-terminal sequence, poly(A) tail, 5' cap
MeSH terms
Amino Acid Sequence, Binding Sites, Humans, Molecular Sequence Data, Peptide Fragments, Peptide Initiation Factors, Precipitin Tests, Protein Binding, Recombinant Proteins, RNA, Messenger, Protein Biosynthesis, RNA-Binding Proteins, Sequence Homology, Amino Acid, Poly(A)-Binding Proteins, Eukaryotic Initiation Factor-4G

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