5izk: Difference between revisions
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The | ==The crystal structure of human eEFSec in complex with GDP== | ||
<StructureSection load='5izk' size='340' side='right' caption='[[5izk]], [[Resolution|resolution]] 3.25Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[5izk]] is a 2 chain structure. 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 [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5IZK FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene></td></tr> | |||
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[5izm|5izm]], [[5izl|5izl]]</td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5izk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5izk OCA], [http://pdbe.org/5izk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5izk RCSB], [http://www.ebi.ac.uk/pdbsum/5izk PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5izk ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[[http://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®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 5izk" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Dobosz-Bartoszek, M]] | |||
[[Category: Simonovic, M]] | |||
[[Category: Elongation factor]] | |||
[[Category: Gdp]] | |||
[[Category: Gtpase]] | |||
[[Category: Selenocysteine]] | |||
[[Category: Selenocysteine trna]] | |||
[[Category: Translation]] | |||
Revision as of 09:30, 19 October 2016
The crystal structure of human eEFSec in complex with GDP
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