View source for 1eov


==FREE ASPARTYL-TRNA SYNTHETASE (ASPRS) (E.C. 6.1.1.12) FROM YEAST==
<StructureSection load='1eov' size='340' side='right'caption='[[1eov]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1eov]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EOV OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EOV 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]] 2.3&#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=1eov FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1eov OCA], [https://pdbe.org/1eov PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1eov RCSB], [https://www.ebi.ac.uk/pdbsum/1eov PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1eov ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/SYDC_YEAST SYDC_YEAST] 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/eo/1eov_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1eov ConSurf].
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== Publication Abstract from PubMed ==
Aminoacyl-tRNA synthetases catalyze the specific charging of amino acid residues on tRNAs. Accurate recognition of a tRNA by its synthetase is achieved through sequence and structural signalling. It has been shown that tRNAs undergo large conformational changes upon binding to enzymes, but little is known about the conformational rearrangements in tRNA-bound synthetases. To address this issue the crystal structure of the dimeric class II aspartyl-tRNA synthetase (AspRS) from yeast was solved in its free form and compared to that of the protein associated to the cognate tRNA(Asp). The use of an enzyme truncated in N terminus improved the crystal quality and allowed us to solve and refine the structure of free AspRS at 2.3 A resolution. For the first time, snapshots are available for the different macromolecular states belonging to the same tRNA aminoacylation system, comprising the free forms for tRNA and enzyme, and their complex. Overall, the synthetase is less affected by the association than the tRNA, although significant local changes occur. They concern a rotation of the anticodon binding domain and a movement in the hinge region which connects the anticodon binding and active-site domains in the AspRS subunit. The most dramatic differences are observed in two evolutionary conserved loops. Both are in the neighborhood of the catalytic site and are of importance for ligand binding. The combination of this structural analysis with mutagenesis and enzymology data points to a tRNA binding process that starts by a recognition event between the tRNA anticodon loop and the synthetase anticodon binding module.

The free yeast aspartyl-tRNA synthetase differs from the tRNA(Asp)-complexed enzyme by structural changes in the catalytic site, hinge region, and anticodon-binding domain.,Sauter C, Lorber B, Cavarelli J, Moras D, Giege R J Mol Biol. 2000 Jun 23;299(5):1313-24. PMID:10873455<ref>PMID:10873455</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1eov" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Saccharomyces cerevisiae]]
[[Category: Cavarelli J]]
[[Category: Giege R]]
[[Category: Lorber B]]
[[Category: Moras D]]
[[Category: Sauter C]]