View source for 4ncf


==Crystal structure of eukaryotic translation initiation factor eIF5B (399-852) from Saccharomyces cerevisiae in complex with GDP==
<StructureSection load='4ncf' size='340' side='right'caption='[[4ncf]], [[Resolution|resolution]] 3.02&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4ncf]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae_S288C Saccharomyces cerevisiae S288C]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4NCF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4NCF 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]] 3.015&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</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=4ncf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ncf OCA], [https://pdbe.org/4ncf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ncf RCSB], [https://www.ebi.ac.uk/pdbsum/4ncf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ncf ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/IF2P_YEAST IF2P_YEAST] Function in general translation initiation by promoting the binding of the formylmethionine-tRNA to ribosomes. Seems to function along with eIF-2.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
eIF5B is a eukaryal translational GTPase that catalyzes ribosomal subunit joining to form elongation-competent ribosomes. Despite its central role in protein synthesis, the mechanistic details that govern the function of eIF5B or its archaeal and bacterial (IF2) orthologs remained unclear. Here, we present six high-resolution crystal structures of eIF5B in its apo, GDP- and GTP-bound form that, together with an analysis of the thermodynamics of nucleotide binding, provide a detailed picture of the entire nucleotide cycle performed by eIF5B. Our data show that GTP binding induces significant conformational changes in the two conserved switch regions of the G domain, resulting in the reorganization of the GTPase center. These rearrangements are accompanied by the rotation of domain II relative to the G domain and release of domain III from its stable contacts with switch 2, causing an increased intrinsic flexibility in the free GTP-bound eIF5B. Based on these data, we propose a novel domain release mechanism for eIF5B/IF2 activation that explains how eIF5B and IF2 fulfill their catalytic role during ribosomal subunit joining.

eIF5B employs a novel domain release mechanism to catalyze ribosomal subunit joining.,Kuhle B, Ficner R EMBO J. 2014 May 16;33(10):1177-91. doi: 10.1002/embj.201387344. Epub 2014 Mar, 31. PMID:24686316<ref>PMID:24686316</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4ncf" style="background-color:#fffaf0;"></div>

==See Also==
*[[Eukaryotic initiation factor 3D structures|Eukaryotic initiation factor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae S288C]]
[[Category: Ficner R]]
[[Category: Kuhle B]]