3am7: Difference between revisions
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==Crystal structure of the ternary complex of eIF4E-M7GTP-4EBP2 peptide== | |||
<StructureSection load='3am7' size='340' side='right'caption='[[3am7]], [[Resolution|resolution]] 2.20Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[3am7]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3AM7 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3AM7 FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MGP:7-METHYL-GUANOSINE-5-TRIPHOSPHATE'>MGP</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=3am7 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3am7 OCA], [https://pdbe.org/3am7 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3am7 RCSB], [https://www.ebi.ac.uk/pdbsum/3am7 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3am7 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/IF4E_HUMAN IF4E_HUMAN] Its translation stimulation activity is repressed by binding to the complex CYFIP1-FMR1 (By similarity). 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. 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.<ref>PMID:16271312</ref> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
To clarify the higher eukaryotic initiation factor 4E (eIF4E) binding selectivity of 4E-binding protein 2 (4E-BP2) than of 4E-BP1, as determined by Trp fluorescence analysis, the crystal structure of the eIF4E binding region of 4E-BP2 in complex with m(7) GTP-bound human eIF4E has been determined by X-ray diffraction analysis and compared with that of 4E-BP1. The crystal structure revealed that the Pro47-Ser65 moiety of 4E-BP2 adopts a L-shaped conformation involving extended and alpha-helical structures and extends over the N-terminal loop and two different helix regions of eIF4E through hydrogen bonds, and electrostatic and hydrophobic interactions; these features were similarly observed for 4E-BP1. Although the pattern of the overall interaction of 4E-BP2 with eIF4E was similar to that of 4E-BP1, a notable difference was observed for the 60-63 sequence in relation to the conformation and binding selectivity of the 4E-BP isoform, i.e. Met-Glu-Cys-Arg for 4E-BP1 and Leu-Asp-Arg-Arg for 4E-BP2. In this paper, we report that the structural scaffold of the eIF4E binding preference for 4E-BP2 over 4E-BP1 is based on the stacking of the Arg63 planar side chain on the Trp73 indole ring of eIF4E and the construction of a compact hydrophobic space around the Trp73 indole ring by the Leu59-Leu60 sequence of 4E-BP2. | |||
Structural scaffold for eIF4E binding selectivity of 4E-BP isoforms: crystal structure of eIF4E binding region of 4E-BP2 and its comparison with that of 4E-BP1.,Fukuyo A, In Y, Ishida T, Tomoo K J Pept Sci. 2011 Sep;17(9):650-7. doi: 10.1002/psc.1384. Epub 2011 Jun 10. PMID:21661078<ref>PMID:21661078</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 3am7" style="background-color:#fffaf0;"></div> | |||
==See Also== | ==See Also== | ||
*[[Eukaryotic initiation factor|Eukaryotic initiation factor]] | *[[Eukaryotic initiation factor 3D structures|Eukaryotic initiation factor 3D structures]] | ||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Fukuyo | [[Category: Large Structures]] | ||
[[Category: In | [[Category: Fukuyo A]] | ||
[[Category: Ishida | [[Category: In Y]] | ||
[[Category: Tomoo | [[Category: Ishida T]] | ||
[[Category: Tomoo K]] | |||