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1riq

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[[Image:1riq.gif|left|200px]]<br /><applet load="1riq" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1riq, resolution 2.14&Aring;" />
 
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'''The crystal structure of the catalytic fragment of the alanyl-tRNA synthetase'''<br />
 
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==Overview==
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==The crystal structure of the catalytic fragment of the alanyl-tRNA synthetase==
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Early work on aminoacylation of alanine-specific tRNA (tRNA(Ala)) by alanyl-tRNA synthetase (AlaRS) gave rise to the concept of an early "second genetic code" imbedded in the acceptor stems of tRNAs. A single conserved and position-specific G:U base pair in the tRNA acceptor stem is the key identity determinant. Further understanding has been limited due to lack of a crystal structure of the enzyme. We determined a 2.14 A crystal structure of the 453 amino acid catalytic fragment of Aquifex aeolicus AlaRS. It contains the catalytic domain characteristic of class II synthetases, a helical domain with a hairpin motif critical for acceptor-stem recognition, and a C-terminal domain of a mixed alpha/beta fold. Docking of tRNA(Ala) on AlaRS shows critical contacts with the three domains, consistent with previous mutagenesis and functional data. It also suggests conformational flexibility within the C domain, which might allow for the positional variation of the key G:U base pair seen in some tRNA(Ala)s.
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<StructureSection load='1riq' size='340' side='right'caption='[[1riq]], [[Resolution|resolution]] 2.14&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1riq]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RIQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1RIQ 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]] 2.14&#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=MSE:SELENOMETHIONINE'>MSE</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=1riq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1riq OCA], [https://pdbe.org/1riq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1riq RCSB], [https://www.ebi.ac.uk/pdbsum/1riq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1riq ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/SYA_AQUAE SYA_AQUAE] Catalyzes the attachment of alanine to tRNA(Ala) in a two-step reaction: alanine is first activated by ATP to form Ala-AMP and then transferred to the acceptor end of tRNA(Ala). Also edits incorrectly charged Ser-tRNA(Ala) and Gly-tRNA(Ala) via its editing domain (By similarity).[HAMAP-Rule:MF_00036]
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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/ri/1riq_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=1riq 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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1RIQ is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Aquifex_aeolicus Aquifex aeolicus]. Active as [http://en.wikipedia.org/wiki/Alanine--tRNA_ligase Alanine--tRNA ligase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=6.1.1.7 6.1.1.7] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RIQ 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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Alanyl-tRNA synthetase crystal structure and design for acceptor-stem recognition., Swairjo MA, Otero FJ, Yang XL, Lovato MA, Skene RJ, McRee DE, Ribas de Pouplana L, Schimmel P, Mol Cell. 2004 Mar 26;13(6):829-41. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=15053876 15053876]
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[[Category: Alanine--tRNA ligase]]
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[[Category: Aquifex aeolicus]]
[[Category: Aquifex aeolicus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Lovato, M A.]]
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[[Category: Lovato MA]]
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[[Category: McRee, D E.]]
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[[Category: McRee DE]]
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[[Category: Otero, F J.]]
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[[Category: Otero FJ]]
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[[Category: Pouplana, L Ribas de.]]
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[[Category: Ribas de Pouplana L]]
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[[Category: Schimmel, P.]]
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[[Category: Schimmel P]]
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[[Category: Skene, R J.]]
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[[Category: Skene RJ]]
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[[Category: Swairjo, M A.]]
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[[Category: Swairjo MA]]
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[[Category: Yang, X L.]]
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[[Category: Yang X-L]]
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[[Category: beta sheet and flanking helices]]
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[[Category: class ii aminoacyl-trna synthetase]]
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[[Category: helix-loop-helix motif]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:51:18 2008''
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Current revision

The crystal structure of the catalytic fragment of the alanyl-tRNA synthetase

PDB ID 1riq

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