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Title: Molecular mechanism of the dual activity of 4EGI-1: Dissociating eIF4G from eIF4E but stabilizing the binding of unphosphorylated 4E-BP1

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Harvard Medical School, Boston, MA (United States). Dept. of Biological Chemistry and Molecular Pharmacology

The eIF4E-binding protein (4E-BP) is a phosphorylation-dependent regulator of protein synthesis. The nonphosphorylated or minimally phosphorylated form binds translation initiation factor 4E (eIF4E), preventing binding of eIF4G and the recruitment of the small ribosomal subunit. Signaling events stimulate serial phosphorylation of 4E-BP, primarily by mammalian target of rapamycin complex 1 (mTORC1) at residues T37/T46, followed by T70 and S65. Hyperphosphorylated 4E-BP dissociates from eIF4E, allowing eIF4E to interact with eIF4G and translation initiation to resume. Because overexpression of eIF4E is linked to cellular transformation, 4E-BP is a tumor suppressor, and up-regulation of its activity is a goal of interest for cancer therapy. A recently discovered small molecule, eIF4E/eIF4G interaction inhibitor 1 (4EGI-1), disrupts the eIF4E/eIF4G interaction and promotes binding of 4E-BP1 to eIF4E. Structures of 14- to 16-residue 4E-BP fragments bound to eIF4E contain the eIF4E consensus binding motif, 54YXXXXLΦ60 (motif 1) but lack known phosphorylation sites. We report in this paper a 2.1-Å crystal structure of mouse eIF4E in complex with m7GTP and with a fragment of human 4E-BP1, extended C-terminally from the consensus-binding motif (4E-BP150–84). The extension, which includes a proline-turn-helix segment (motif 2) followed by a loop of irregular structure, reveals the location of two phosphorylation sites (S65 and T70). Our major finding is that the C-terminal extension (motif 3) is critical to 4E-BP1–mediated cell cycle arrest and that it partially overlaps with the binding site of 4EGI-1. Finally, the binding of 4E-BP1 and 4EGI-1 to eIF4E is therefore not mutually exclusive, and both ligands contribute to shift the equilibrium toward the inhibition of translation initiation.

Research Organization:
Harvard Medical School, Boston, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Inst. of Health (NIH) (United States); Japan Society for the Promotion of Science (JSPS); Fonds de la Recherche en Santé au Québec (Canada); Alexander S. Onassis Public Benefit Foundation (Greece)
Grant/Contract Number:
AC02-06CH11357; P41 EB002026; CA68262; GM047467; GM103403
OSTI ID:
1208688
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 30; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 68 works
Citation information provided by
Web of Science

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Cited By (20)

Mitosis-related phosphorylation of the eukaryotic translation suppressor 4E-BP1 and its interaction with eukaryotic translation initiation factor 4E (eIF4E) journal June 2019
Non-uniform sampling in quantitative assessment of heterogeneous solid-state NMR line shapes journal December 2019
High throughput discovery of functional protein modifications by Hotspot Thermal Profiling journal August 2019
The androgen receptor is a negative regulator of eIF4E phosphorylation at S209: implications for the use of mTOR inhibitors in advanced prostate cancer journal July 2017
The molecular choreography of protein synthesis: translational control, regulation, and pathways journal January 2016
Translational control of aberrant stress responses as a hallmark of cancer: Translational control of the tumour stress response journal February 2018
Co-regulation of mRNA translation by TDP-43 and Fragile X Syndrome protein FMRP journal August 2016
IRES-mediated translation of foot-and-mouth disease virus (FMDV) in cultured cells derived from FMDV-susceptible and -insusceptible animals journal March 2016
Structural motifs in eIF4G and 4E-BPs modulate their binding to eIF4E to regulate translation initiation in yeast text January 2018
PEITC-mediated inhibition of mRNA translation is associated with both inhibition of mTORC1 and increased eIF2α phosphorylation in established cell lines and primary human leukemia cells. journalarticle January 2016
Functional role of eukaryotic translation initiation factor 4 gamma 1 (EIF4G1) in NSCLC journal March 2016
Structural basis for LeishIF4E-1 modulation by an interacting protein in the human parasite Leishmania major journal March 2018
Micropeptide CIP 2A‐ BP encoded by LINC 00665 inhibits triple‐negative breast cancer progression journal November 2019
Noncanonical SQSTM1/p62-Nrf2 pathway activation mediates proteasome inhibitor resistance in multiple myeloma cells via redox, metabolic and translational reprogramming journal September 2016
Mitotic protein kinase CDK1 phosphorylation of mRNA translation regulator 4E-BP1 Ser83 may contribute to cell transformation journal July 2016
The 4E-BP growth pathway regulates the effect of ambient temperature on Drosophila metabolism and lifespan journal August 2017
Characterization of the Expression of the RNA Binding Protein eIF4G1 and Its Clinicopathological Correlation with Serous Ovarian Cancer journal September 2016
Eukaryotic initiation factor 4E (eIF4E): A recap of the cap‐binding protein journal April 2019
A Conditionally Fluorescent Peptide Reporter of Secondary Structure Modulation journal October 2018
Profiling Reactive Metabolites via Chemical Trapping and Targeted Mass Spectrometry journal June 2016

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