1ej4

COCRYSTAL STRUCTURE OF EIF4E/4E-BP1 PEPTIDECOCRYSTAL STRUCTURE OF EIF4E/4E-BP1 PEPTIDE

Structural highlights

1ej4 is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	1ej1, 1ejh
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[IF4E_MOUSE] Recognizes and binds the 7-methylguanosine-containing mRNA cap during an early step in the initiation of protein synthesis and facilitates ribosome binding by inducing the unwinding of the mRNAs secondary structures. May play an important role in spermatogenesis through translational regulation of stage-specific mRNAs during germ cell development (By similarity). Its translation stimulation activity is repressed by binding to the complex CYFIP1-FMR1. Component of the CYFIP1-EIF4E-FMR1 complex which binds to the mRNA cap and mediates translational repression. In the CYFIP1-EIF4E-FMR1 complex this subunit mediates the binding to the mRNA cap.^[1]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

eIF4G uses a conserved Tyr-X-X-X-X-Leu-phi segment (where X is variable and phi is hydrophobic) to recognize eIF4E during cap-dependent translation initiation in eukaryotes. High-resolution X-ray crystallography and complementary biophysical methods have revealed that this eIF4E recognition motif undergoes a disorder-to-order transition, adopting an L-shaped, extended chain/alpha-helical conformation when it interacts with a phylogenetically invariant portion of the convex surface of eIF4E. Inhibitors of translation initiation known as eIF4E-binding proteins (4E-BPs) contain similar eIF4E recognition motifs. These molecules are molecular mimics of eIF4G, which act by occupying the same binding site on the convex dorsum of eIF4E and blocking assembly of the translation machinery. The implications of our results for translation initiation are discussed in detail, and a molecular mechanism for relief of translation inhibition following phosphorylation of the 4E-BPs is proposed.

Cap-dependent translation initiation in eukaryotes is regulated by a molecular mimic of eIF4G.,Marcotrigiano J, Gingras AC, Sonenberg N, Burley SK Mol Cell. 1999 Jun;3(6):707-16. PMID:10394359^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Napoli I, Mercaldo V, Boyl PP, Eleuteri B, Zalfa F, De Rubeis S, Di Marino D, Mohr E, Massimi M, Falconi M, Witke W, Costa-Mattioli M, Sonenberg N, Achsel T, Bagni C. The fragile X syndrome protein represses activity-dependent translation through CYFIP1, a new 4E-BP. Cell. 2008 Sep 19;134(6):1042-54. doi: 10.1016/j.cell.2008.07.031. PMID:18805096 doi:http://dx.doi.org/10.1016/j.cell.2008.07.031
↑ Marcotrigiano J, Gingras AC, Sonenberg N, Burley SK. Cap-dependent translation initiation in eukaryotes is regulated by a molecular mimic of eIF4G. Mol Cell. 1999 Jun;3(6):707-16. PMID:10394359

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OCA

[1] Napoli I, Mercaldo V, Boyl PP, Eleuteri B, Zalfa F, De Rubeis S, Di Marino D, Mohr E, Massimi M, Falconi M, Witke W, Costa-Mattioli M, Sonenberg N, Achsel T, Bagni C. The fragile X syndrome protein represses activity-dependent translation through CYFIP1, a new 4E-BP. Cell. 2008 Sep 19;134(6):1042-54. doi: 10.1016/j.cell.2008.07.031. PMID:18805096 doi:http://dx.doi.org/10.1016/j.cell.2008.07.031

[2] Marcotrigiano J, Gingras AC, Sonenberg N, Burley SK. Cap-dependent translation initiation in eukaryotes is regulated by a molecular mimic of eIF4G. Mol Cell. 1999 Jun;3(6):707-16. PMID:10394359

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