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1qe0

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[[Image:1qe0.gif|left|200px]]
 
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{{Structure
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==CRYSTAL STRUCTURE OF APO S. AUREUS HISTIDYL-TRNA SYNTHETASE==
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|PDB= 1qe0 |SIZE=350|CAPTION= <scene name='initialview01'>1qe0</scene>, resolution 2.7&Aring;
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<StructureSection load='1qe0' size='340' side='right'caption='[[1qe0]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND=
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<table><tr><td colspan='2'>[[1qe0]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QE0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QE0 FirstGlance]. <br>
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Histidine--tRNA_ligase Histidine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.21 6.1.1.21] </span>
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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]] 2.7&#8491;</td></tr>
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|GENE=
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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=1qe0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qe0 OCA], [https://pdbe.org/1qe0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qe0 RCSB], [https://www.ebi.ac.uk/pdbsum/1qe0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qe0 ProSAT]</span></td></tr>
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|DOMAIN=
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</table>
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|RELATEDENTRY=
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== Function ==
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1qe0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qe0 OCA], [http://www.ebi.ac.uk/pdbsum/1qe0 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1qe0 RCSB]</span>
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[https://www.uniprot.org/uniprot/SYH_STAAU SYH_STAAU]
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}}
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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/qe/1qe0_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=1qe0 ConSurf].
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<div style="clear:both"></div>
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'''CRYSTAL STRUCTURE OF APO S. AUREUS HISTIDYL-TRNA SYNTHETASE'''
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==See Also==
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*[[Aminoacyl tRNA synthetase 3D structures|Aminoacyl tRNA synthetase 3D structures]]
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__TOC__
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==Overview==
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</StructureSection>
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The crystal structure of the Staphylococcus aureus histidyl-tRNA synthetase apoprotein has been determined at 2.7 A resolution. Several important loops in the active site either become disordered or adopt very different conformations compared to their ligand-bound states. These include the histidine A motif (Arg257-Tyr262) that is essential for substrate recognition, a loop (Gly52-Lys62) that seems to control the communication between the histidine and ATP binding sites, the motif 2 loop (Glu114-Arg120) that binds ATP, and the insertion domain that is likely to bind tRNA. These ligand-induced structural changes are supported by fluorescence experiments, which also suggest highly cooperative dynamics. A dynamic and cooperative active site is most likely necessary for the proper functioning of the histidyl-tRNA synthetase, and suggests a novel mechanism for improving charging fidelity.
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[[Category: Large Structures]]
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==About this Structure==
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1QE0 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Staphylococcus_aureus Staphylococcus aureus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QE0 OCA].
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==Reference==
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Cooperative structural dynamics and a novel fidelity mechanism in histidyl-tRNA synthetases., Qiu X, Janson CA, Blackburn MN, Chhohan IK, Hibbs M, Abdel-Meguid SS, Biochemistry. 1999 Sep 21;38(38):12296-304. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10493797 10493797]
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[[Category: Histidine--tRNA ligase]]
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[[Category: Single protein]]
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[[Category: Staphylococcus aureus]]
[[Category: Staphylococcus aureus]]
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[[Category: Abdel-Meguid, S S.]]
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[[Category: Abdel-Meguid SS]]
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[[Category: Blackburn, M N.]]
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[[Category: Blackburn MN]]
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[[Category: Chohan, I K.]]
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[[Category: Chohan IK]]
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[[Category: Hibbs, M.]]
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[[Category: Hibbs M]]
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[[Category: Janson, C A.]]
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[[Category: Janson CA]]
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[[Category: Qiu, X.]]
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[[Category: Qiu X]]
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[[Category: beta sheet]]
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[[Category: class ii trna synthetase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:12:23 2008''
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Current revision

CRYSTAL STRUCTURE OF APO S. AUREUS HISTIDYL-TRNA SYNTHETASE

PDB ID 1qe0

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