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Molecular and Cellular Biology, June 2004, p. 4920-4928, Vol. 24, No. 11
0270-7306/04/$08.00+0     DOI: 10.1128/MCB.24.11.4920-4928.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Selective Modification of Eukaryotic Initiation Factor 4F (eIF4F) at the Onset of Cell Differentiation: Recruitment of eIF4GII and Long-Lasting Phosphorylation of eIF4E

Sandrine Caron,1 Martine Charon,1 Elisabeth Cramer,1 Nahum Sonenberg,2 and Isabelle Dusanter-Fourt1*

Department of Hematology, Institut Cochin, 75014 Paris, France,1 Department of Biochemistry and McGill Cancer Center, McGill University, Montreal, Canada H3G 1Y62

Received 4 November 2003/ Returned for modification 2 December 2003/ Accepted 1 March 2004

mRNA translation is mainly regulated at the level of initiation, a process that involves the synergistic action of the 5' cap structure and the 3' poly(A) tail at the ends of eukaryotic mRNA. The eukaryote initiation factor 4G(eIF4G) is a pivotal scaffold protein that forms a critical link between mRNA cap structure, poly(A) tail, and the small ribosomal subunit. There are two functional homologs of eIF4G in mammals, the original eIF4G, renamed eIF4GI, and eIF4GII that functionally complements eIF4GI. To date, biochemical and functional analysis have not identified differential activities for eIF4GI and eIF4GII. In this report, we demonstrate that eIF4GII, but not eIF4GI, is selectively recruited to capped mRNA at the onset of cell differentiation. This recruitment is coincident with a strong and long-lasting phosphorylation of eIF4E and the release of 4E-BP1, a suppressor of eIF4E function, from the cap structure, without a concomitant change in 4E-BP1's phosphorylation. Our data further indicate that cytokines such as thrombopoietin can differentially regulate eIF4GI/II activities. These results provide the first evidence that eIF4GI/II does fulfill selective roles in mammalian cells.

* Corresponding author. Mailing address: Department of Hematology, Institut Cochin, INSERM U567, Maternité Port-Royal, 123 Bd Port-Royal, 75014 Paris, France. Phone: (1) 53 10 43 54. Fax: (1) 43 25 11 67. E-mail: dusanter{at}cochin.inserm.fr.

Molecular and Cellular Biology, June 2004, p. 4920-4928, Vol. 24, No. 11
0022-538X/04/$08.00+0     DOI: 10.1128/MCB.24.11.4920-4928.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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