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4ts1

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[[Image:4ts1.jpg|left|200px]]
 
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==CRYSTAL STRUCTURE OF A DELETION MUTANT OF A TYROSYL-T/RNA SYNTHETASE COMPLEXED WITH TYROSINE==
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The line below this paragraph, containing "STRUCTURE_4ts1", creates the "Structure Box" on the page.
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<StructureSection load='4ts1' size='340' side='right'caption='[[4ts1]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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== Structural highlights ==
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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<table><tr><td colspan='2'>[[4ts1]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Geobacillus_stearothermophilus Geobacillus stearothermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4TS1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4TS1 FirstGlance]. <br>
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or leave the SCENE parameter empty for the default display.
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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]] 2.5&#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=TYR:TYROSINE'>TYR</scene></td></tr>
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{{STRUCTURE_4ts1| PDB=4ts1 | SCENE= }}
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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=4ts1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ts1 OCA], [https://pdbe.org/4ts1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ts1 RCSB], [https://www.ebi.ac.uk/pdbsum/4ts1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ts1 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/SYY_GEOSE SYY_GEOSE] Catalyzes the attachment of tyrosine to tRNA(Tyr) in a two-step reaction: tyrosine is first activated by ATP to form Tyr-AMP and then transferred to the acceptor end of tRNA(Tyr).
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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/ts/4ts1_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=4ts1 ConSurf].
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<div style="clear:both"></div>
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'''CRYSTAL STRUCTURE OF A DELETION MUTANT OF A TYROSYL-T/RNA SYNTHETASE COMPLEXED WITH TYROSINE'''
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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 a deletion mutant of tyrosyl-tRNA synthetase from Bacillus stearothermophilus has been determined at 2.5 A resolution using molecular replacement techniques. The genetically engineered molecule catalyses the activation of tyrosine with kinetic properties similar to those of the wild-type enzyme but no longer binds tRNATyr. It contains 319 residues corresponding to the region of the polypeptide chain for which interpretable electron density is present in crystals of the wild-type enzyme. The partly refined model of the wild-type enzyme was used as a starting point in determining the structure of the truncated mutant. The new crystals are of space group P2(1) and contain the molecular dimer within the asymmetric unit. The refined model has a crystallographic R-factor of 18.7% for all reflections between 8 and 2.5 A. Each subunit contains two structural domains: the alpha/beta domain (residues 1 to 220) containing a six-stranded beta-sheet and the alpha-helical domain (residues 248 to 319) containing five helices. The alpha/beta domains are related by a non-crystallographic dyad while the alpha-helical domains are in slightly different orientations in the two subunits. The tyrosine substrate binds in a slot at the bottom of a deep active site cleft in the middle of the alpha/beta domain. It is surrounded by polar side-chains and water molecules that are involved in an intricate hydrogen bonding network. Both the alpha-amino and hydroxyl groups of the substrate make good hydrogen bonds with the protein. The amino group forms hydrogen bonds with Tyr169-OH, Asp78-OD1 and Gln173-OE1. The phenolic hydroxyl group forms hydrogen bonds with Asp76-OD1 and Tyr34-OH. In contrast, the substrate carboxyl group makes no direct interactions with the enzyme. The results of both substrate inhibition studies and site-directed mutagenesis experiments have been examined in the light of the refined structure.
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==About this Structure==
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4TS1 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Geobacillus_stearothermophilus Geobacillus stearothermophilus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4TS1 OCA].
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==Reference==
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Crystal structure of a deletion mutant of a tyrosyl-tRNA synthetase complexed with tyrosine., Brick P, Blow DM, J Mol Biol. 1987 Mar 20;194(2):287-97. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/3612807 3612807]
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[[Category: Geobacillus stearothermophilus]]
[[Category: Geobacillus stearothermophilus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Tyrosine--tRNA ligase]]
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[[Category: Blow DM]]
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[[Category: Blow, D M.]]
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[[Category: Brick P]]
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[[Category: Brick, P.]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 22:30:37 2008''
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Current revision

CRYSTAL STRUCTURE OF A DELETION MUTANT OF A TYROSYL-T/RNA SYNTHETASE COMPLEXED WITH TYROSINE

PDB ID 4ts1

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