View source for 5izk


==The crystal structure of human eEFSec in complex with GDP==
<StructureSection load='5izk' size='340' side='right'caption='[[5izk]], [[Resolution|resolution]] 3.25&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5izk]] 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=5IZK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5IZK 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]] 3.25&#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></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=5izk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5izk OCA], [https://pdbe.org/5izk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5izk RCSB], [https://www.ebi.ac.uk/pdbsum/5izk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5izk ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SELB_HUMAN SELB_HUMAN] Translation factor necessary for the incorporation of selenocysteine into proteins. It probably replaces EF-Tu for the insertion of selenocysteine directed by the UGA codon. SelB binds GTP and GDP.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Selenocysteine is the only proteinogenic amino acid encoded by a recoded in-frame UGA codon that does not operate as the canonical opal stop codon. A specialized translation elongation factor, eEFSec in eukaryotes and SelB in prokaryotes, promotes selenocysteine incorporation into selenoproteins by a still poorly understood mechanism. Our structural and biochemical results reveal that four domains of human eEFSec fold into a chalice-like structure that has similar binding affinities for GDP, GTP and other guanine nucleotides. Surprisingly, unlike in eEF1A and EF-Tu, the guanine nucleotide exchange does not cause a major conformational change in domain 1 of eEFSec, but instead induces a swing of domain 4. We propose that eEFSec employs a non-canonical mechanism involving the distinct C-terminal domain 4 for the release of the selenocysteinyl-tRNA during decoding on the ribosome.

Crystal structures of the human elongation factor eEFSec suggest a non-canonical mechanism for selenocysteine incorporation.,Dobosz-Bartoszek M, Pinkerton MH, Otwinowski Z, Chakravarthy S, Soll D, Copeland PR, Simonovic M Nat Commun. 2016 Oct 6;7:12941. doi: 10.1038/ncomms12941. PMID:27708257<ref>PMID:27708257</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5izk" style="background-color:#fffaf0;"></div>

==See Also==
*[[Elongation factor 3D structures|Elongation factor 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Dobosz-Bartoszek M]]
[[Category: Simonovic M]]