View source for 3qtn


==Structure of S. pombe nuclear import adaptor Nro1 (Space group P6522)==
<StructureSection load='3qtn' size='340' side='right'caption='[[3qtn]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3qtn]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Schizosaccharomyces_pombe Schizosaccharomyces pombe]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3QTN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3QTN 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]] 3.499&#8491;</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=3qtn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3qtn OCA], [https://pdbe.org/3qtn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3qtn RCSB], [https://www.ebi.ac.uk/pdbsum/3qtn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3qtn ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/ETT1_SCHPO ETT1_SCHPO] Required for correct translation termination (By similarity). Positive regulator of the stability of the N-terminal transcription factor domain (Sre1N) of sre1 which is released from the membrane and enters the nucleus to activate hypoxic gene expression. Acts also as a direct inhibitor of ofd1. Functions probably by inhibiting the ability of the ofd1 to accelerate Sre1N degradation in absence of oxygen.<ref>PMID:15116432</ref> <ref>PMID:19158663</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
In Saccharomyces cerevisiae, the putative 2-OG-Fe(II) dioxygenase Tpa1 and its partner Ett1 have been shown to impact mRNA decay and translation. Hence, inactivation of these factors was shown to influence stop codon read-though. In addition, Tpa1 represses, by an unknown mechanism, genes regulated by Hap1, a transcription factor involved in the response to levels of heme and O(2). The Schizosaccharomyces pombe orthologs of Tpa1 and Ett1, Ofd1, and its partner Nro1, respectively, have been shown to regulate the stability of the Sre1 transcription factor in response to oxygen levels. To gain insight into the function of Nro1/Ett1, we have solved the crystal structure of the S. pombe Nro1 protein deleted of its 54 N-terminal residues. Nro1 unexpectedly adopts a Tetratrico Peptide Repeat (TPR) fold, a motif often responsible for protein or peptide binding. Two ligands, a sulfate ion and an unknown molecule, interact with a cluster of highly conserved amino acids on the protein surface. Mutation of these residues demonstrates that these ligand binding sites are essential for Ett1 function in S. cerevisiae, as investigated by assaying for efficient translation termination.

Structural and functional analysis of Nro1/Ett1: a protein involved in translation termination in S. cerevisiae and in O2-mediated gene control in S. pombe.,Rispal D, Henri J, van Tilbeurgh H, Graille M, Seraphin B RNA. 2011 Jul;17(7):1213-24. Epub 2011 May 24. PMID:21610214<ref>PMID:21610214</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3qtn" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Schizosaccharomyces pombe]]
[[Category: Graille M]]
[[Category: Henri J]]
[[Category: Rispal D]]
[[Category: Seraphin B]]
[[Category: Van Tilbeurgh H]]