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2gja

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(New page: 200px<br /><applet load="2gja" size="450" color="white" frame="true" align="right" spinBox="true" caption="2gja, resolution 1.85&Aring;" /> '''Structure of the Mnm...)
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[[Image:2gja.gif|left|200px]]<br /><applet load="2gja" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="2gja, resolution 1.85&Aring;" />
 
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'''Structure of the MnmE G-domain in complex with GDP*AlF4-, Mg2+ and NH4+'''<br />
 
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==Overview==
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==Structure of the MnmE G-domain in complex with GDP*AlF4-, Mg2+ and NH4+==
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MnmE, a Guanine nucleotide-binding protein conserved between bacteria and, man, is involved in the modification of tRNAs. Here we provide biochemical, and X-ray structural evidence for a new GTP-hydrolysis mechanism, where, the G-domains of MnmE dimerise in a potassium-dependent manner and induce, GTP hydrolysis. The structure in the presence of GDP-AlFx and potassium, shows how juxtaposition of the subunits induces a conformational change, around the nucleotide which reorients the catalytic machinery. A critical, glutamate is positioned such as to stabilise or activate the attacking, water. Potassium provides a positive charge into the catalytic site in a, position analogous to the arginine finger in the Ras-RasGAP system., Mutational studies show that potassium-dependent dimerisation and GTP, hydrolysis can be uncoupled and that interaction between the G-domains is, a prerequisite for subsequent phosphoryl transfer. We propose a model for, the juxtaposition of G-domains in the full-length protein and how it, induces conformational changes in the putative tRNA-modification centre.
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<StructureSection load='2gja' size='340' side='right'caption='[[2gja]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
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== Structural highlights ==
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==About this Structure==
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<table><tr><td colspan='2'>[[2gja]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_BL21(DE3) Escherichia coli BL21(DE3)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GJA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2GJA FirstGlance]. <br>
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2GJA is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with ALF, MG, NH4 and GDP as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=2GJA OCA].
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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]] 1.85&#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=ALF:TETRAFLUOROALUMINATE+ION'>ALF</scene>, <scene name='pdbligand=GDP:GUANOSINE-5-DIPHOSPHATE'>GDP</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NH4:AMMONIUM+ION'>NH4</scene></td></tr>
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==Reference==
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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=2gja FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2gja OCA], [https://pdbe.org/2gja PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2gja RCSB], [https://www.ebi.ac.uk/pdbsum/2gja PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2gja ProSAT]</span></td></tr>
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Dimerisation-dependent GTPase reaction of MnmE: how potassium acts as GTPase-activating element., Scrima A, Wittinghofer A, EMBO J. 2006 Jun 21;25(12):2940-51. Epub 2006 Jun 8. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16763562 16763562]
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</table>
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[[Category: Escherichia coli]]
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== Function ==
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[[Category: Single protein]]
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[https://www.uniprot.org/uniprot/MNME_ECOLI MNME_ECOLI] Exhibits a very high intrinsic GTPase hydrolysis rate. Involved in the addition of a carboxymethylaminomethyl (cmnm) group at the wobble position (U34) of certain tRNAs, forming tRNA-cmnm(5)s(2)U34.
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[[Category: Scrima, A.]]
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== Evolutionary Conservation ==
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[[Category: Wittinghofer, A.]]
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[[Image:Consurf_key_small.gif|200px|right]]
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[[Category: ALF]]
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Check<jmol>
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[[Category: GDP]]
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<jmolCheckbox>
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[[Category: MG]]
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/gj/2gja_consurf.spt"</scriptWhenChecked>
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[[Category: NH4]]
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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[[Category: alpha-beta-sandwich]]
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<text>to colour the structure by Evolutionary Conservation</text>
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[[Category: g-domain dimer]]
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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=2gja ConSurf].
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Wed Nov 21 11:14:26 2007''
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<div style="clear:both"></div>
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__TOC__
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</StructureSection>
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[[Category: Large Structures]]
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[[Category: Scrima A]]
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[[Category: Wittinghofer A]]

Current revision

Structure of the MnmE G-domain in complex with GDP*AlF4-, Mg2+ and NH4+

PDB ID 2gja

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