1evk

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(New page: 200px<br /><applet load="1evk" size="450" color="white" frame="true" align="right" spinBox="true" caption="1evk, resolution 2.00&Aring;" /> '''CRYSTAL STRUCTURE OF...)
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[[Image:1evk.gif|left|200px]]<br /><applet load="1evk" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1evk, resolution 2.00&Aring;" />
 
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'''CRYSTAL STRUCTURE OF A TRUNCATED FORM OF THREONYL-TRNA SYNTHETASE WITH THE LIGAND THREONINE'''<br />
 
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==Overview==
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==CRYSTAL STRUCTURE OF A TRUNCATED FORM OF THREONYL-TRNA SYNTHETASE WITH THE LIGAND THREONINE==
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Accurate translation of the genetic code depends on the ability of, aminoacyl-tRNA synthetases to distinguish between similar amino acids. In, order to investigate the basis of amino acid recognition and to understand, the role played by the zinc ion present in the active site of, threonyl-tRNA synthetase, we have determined the crystal structures of, complexes of an active truncated form of the enzyme with a threonyl, adenylate analog or threonine. The zinc ion is directly involved in, threonine recognition, forming a pentacoordinate intermediate with both, the amino group and the side chain hydroxyl. Amino acid activation, experiments reveal that the enzyme shows no activation of isosteric, valine, and activates serine at a rate 1,000-fold less than that of, cognate threonine. This study demonstrates that the zinc ion is neither, strictly catalytic nor structural and suggests how the zinc ion ensures, that only amino acids that possess a hydroxyl group attached to the, beta-position are activated.
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<StructureSection load='1evk' size='340' side='right'caption='[[1evk]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1evk]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EVK OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1EVK FirstGlance]. <br>
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</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&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=THR:THREONINE'>THR</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1evk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1evk OCA], [https://pdbe.org/1evk PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1evk RCSB], [https://www.ebi.ac.uk/pdbsum/1evk PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1evk ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/SYT_ECOLI SYT_ECOLI] ThrS is also a translational repressor protein, it controls the translation of its own gene by binding to its mRNA.[HAMAP-Rule:MF_00184]
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ev/1evk_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1evk ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1EVK is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with ZN and THR as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Threonine--tRNA_ligase Threonine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.3 6.1.1.3] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1EVK OCA].
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*[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Zinc ion mediated amino acid discrimination by threonyl-tRNA synthetase., Sankaranarayanan R, Dock-Bregeon AC, Rees B, Bovee M, Caillet J, Romby P, Francklyn CS, Moras D, Nat Struct Biol. 2000 Jun;7(6):461-5. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10881191 10881191]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Threonine--tRNA ligase]]
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[[Category: Dock-Bregeon AC]]
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[[Category: Dock-Bregeon, A.C.]]
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[[Category: Moras D]]
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[[Category: Moras, D.]]
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[[Category: Rees B]]
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[[Category: Rees, B.]]
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[[Category: Sankaranarayanan R]]
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[[Category: Sankaranarayanan, R.]]
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[[Category: THR]]
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[[Category: ZN]]
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[[Category: deletion mutant]]
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[[Category: threonine]]
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[[Category: trna-synthetase]]
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[[Category: zinc ion]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 14:21:25 2007''
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Current revision

CRYSTAL STRUCTURE OF A TRUNCATED FORM OF THREONYL-TRNA SYNTHETASE WITH THE LIGAND THREONINE

PDB ID 1evk

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