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1r8a

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(New page: 200px<br /><applet load="1r8a" size="450" color="white" frame="true" align="right" spinBox="true" caption="1r8a, resolution 2.10&Aring;" /> '''Crystal Structures o...)
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[[Image:1r8a.jpg|left|200px]]<br /><applet load="1r8a" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1r8a, resolution 2.10&Aring;" />
 
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'''Crystal Structures of an Archaeal Class I CCA-Adding Enzyme and Its Nucleotide Complexes'''<br />
 
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==Overview==
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==Crystal Structures of an Archaeal Class I CCA-Adding Enzyme and Its Nucleotide Complexes==
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CCA-adding enzymes catalyze the addition of CCA onto the 3' terminus of, immature tRNAs without using a nucleic acid template and have been divided, into two classes based on their amino acid sequences. We have determined, the crystal structures of a class I CCA-adding enzyme from Archeoglobus, fulgidus (AfCCA) and its complexes with ATP, CTP, or UTP. Although it and, the class II bacterial Bacillus stearothermophilus CCA enzyme (BstCCA), have similar dimensions and domain architectures (head, neck, body, and, tail), only the polymerase domain is structurally homologous. Moreover, the relative orientation of the head domain with respect to the body and, tail domains, which appear likely to bind tRNA, differs significantly, between the two enzyme classes. Unlike the class II BstCCA, this enzyme, binds nucleotides nonspecifically in the absence of bound tRNA. The shape, and electrostatic charge distribution of the AfCCA enzyme suggests a model, for tRNA binding that accounts for the phosphates that are protected from, chemical modification by tRNA binding to AfCCA. The structures of the, AfCCA enzyme and the eukaryotic poly(A) polymerase are very similar, implying a close evolutionary relationship between them.
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<StructureSection load='1r8a' size='340' side='right'caption='[[1r8a]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1r8a]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Archaeoglobus_fulgidus Archaeoglobus fulgidus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1R8A OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1R8A 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]] 2.1&#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=MN:MANGANESE+(II)+ION'>MN</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=1r8a FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1r8a OCA], [https://pdbe.org/1r8a PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1r8a RCSB], [https://www.ebi.ac.uk/pdbsum/1r8a PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1r8a ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/CCA_ARCFU CCA_ARCFU] Catalyzes the addition and repair of the essential 3'-terminal CCA sequence in tRNAs without using a nucleic acid template. Adds these three nucleotides in the order of C, C, and A to the tRNA nucleotide-73, using CTP and ATP as substrates and producing inorganic pyrophosphate.<ref>PMID:14592988</ref>
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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/r8/1r8a_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=1r8a 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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1R8A is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Archaeoglobus_fulgidus Archaeoglobus fulgidus] with MN and NA as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/tRNA_adenylyltransferase tRNA adenylyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.7.25 2.7.7.25] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1R8A OCA].
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*[[CCA-adding enzyme 3D structures|CCA-adding enzyme 3D structures]]
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== References ==
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==Reference==
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<references/>
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Crystal structures of an archaeal class I CCA-adding enzyme and its nucleotide complexes., Xiong Y, Li F, Wang J, Weiner AM, Steitz TA, Mol Cell. 2003 Nov;12(5):1165-72. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=14636575 14636575]
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__TOC__
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</StructureSection>
[[Category: Archaeoglobus fulgidus]]
[[Category: Archaeoglobus fulgidus]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: tRNA adenylyltransferase]]
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[[Category: Li F]]
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[[Category: Li, F.]]
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[[Category: Steitz TA]]
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[[Category: Steitz, T.A.]]
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[[Category: Wang J]]
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[[Category: Wang, J.]]
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[[Category: Weiner AM]]
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[[Category: Weiner, A.M.]]
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[[Category: Xiong Y]]
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[[Category: Xiong, Y.]]
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[[Category: MN]]
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[[Category: NA]]
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[[Category: cca adding enzyme]]
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[[Category: nucleotidyltransferase]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 01:20:47 2007''
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Crystal Structures of an Archaeal Class I CCA-Adding Enzyme and Its Nucleotide Complexes

PDB ID 1r8a

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