1kmm

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[[Image:1kmm.gif|left|200px]]
 
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==HISTIDYL-TRNA SYNTHETASE COMPLEXED WITH HISTIDYL-ADENYLATE==
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The line below this paragraph, containing "STRUCTURE_1kmm", creates the "Structure Box" on the page.
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<StructureSection load='1kmm' size='340' side='right'caption='[[1kmm]], [[Resolution|resolution]] 2.60&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'>[[1kmm]] is a 4 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=1KMM OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1KMM 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]] 2.6&#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=HAM:HISTIDYL-ADENOSINE+MONOPHOSPHATE'>HAM</scene></td></tr>
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{{STRUCTURE_1kmm| PDB=1kmm | 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=1kmm FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1kmm OCA], [https://pdbe.org/1kmm PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1kmm RCSB], [https://www.ebi.ac.uk/pdbsum/1kmm PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1kmm ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/SYH_ECOLI SYH_ECOLI]
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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/km/1kmm_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=1kmm ConSurf].
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<div style="clear:both"></div>
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'''HISTIDYL-TRNA SYNTHETASE COMPLEXED WITH HISTIDYL-ADENYLATE'''
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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 an enzyme-substrate complex with histidyl-tRNA synthetase from Escherichia coli, ATP, and the amino acid analog histidinol is described and compared with the previously obtained enzyme-product complex with histidyl-adenylate. An active site arginine, Arg-259, unique to all histidyl-tRNA synthetases, plays the role of the catalytic magnesium ion seen in seryl-tRNA synthetase. When Arg-259 is substituted with histidine, the apparent second order rate constant (kcat/Km) for the pyrophosphate exchange reaction and the aminoacylation reaction decreases 1,000-fold and 500-fold, respectively. Crystals soaked with MnCl2 reveal the existence of two metal binding sites between beta- and gamma-phosphates; these sites appear to stabilize the conformation of the pyrophosphate. The use of both conserved metal ions and arginine in phosphoryl transfer provides evidence of significant early functional divergence of class II aminoacyl-tRNA synthetases.
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==About this Structure==
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1KMM is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1KMM OCA].
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==Reference==
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The first step of aminoacylation at the atomic level in histidyl-tRNA synthetase., Arnez JG, Augustine JG, Moras D, Francklyn CS, Proc Natl Acad Sci U S A. 1997 Jul 8;94(14):7144-9. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/9207058 9207058]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Histidine--tRNA ligase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Arnez JG]]
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[[Category: Arnez, J G.]]
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[[Category: Francklyn CS]]
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[[Category: Francklyn, C S.]]
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[[Category: Moras D]]
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[[Category: Moras, D.]]
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[[Category: Aminoacyl-trna synthase]]
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[[Category: Ligase]]
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[[Category: Synthetase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 22:55:10 2008''
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Current revision

HISTIDYL-TRNA SYNTHETASE COMPLEXED WITH HISTIDYL-ADENYLATE

PDB ID 1kmm

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