1obw

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[[Image:1obw.jpg|left|200px]]<br /><applet load="1obw" size="350" color="white" frame="true" align="right" spinBox="true"
 
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caption="1obw, resolution 1.9&Aring;" />
 
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'''STRUCTURE OF INORGANIC PYROPHOSPHATASE'''<br />
 
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==Overview==
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==STRUCTURE OF INORGANIC PYROPHOSPHATASE==
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Crystalline holo inorganic pyrophosphatase from Escherichia coli was grown in the presence of 250 mM MgCl2. The crystal structure has been solved by Patterson search techniques and refined to an R-factor of 17.6% at 1.9 A resolution. The upper estimate of the root-mean-square error in atomic positions is 0.26 A. These crystals belong to space group P3(2)21 with unit cell dimensions a = b = 110.27 A and c = 78.17 A. The asymmetric unit contains a trimer of subunits, i.e., half of the hexameric molecule. In the central cavity of the enzyme molecule, three Mg2+ ions, each shared by two subunits of the hexamer, are found. In the active sites of two crystallographically independent subunits, two Mg2+ ions are bound. The second active site Mg2+ ion is missing in the third subunit. A mechanism of catalysis is proposed whereby a water molecule activated by a Mg2+ ion and Tyr 55 play essential roles.
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<StructureSection load='1obw' size='340' side='right'caption='[[1obw]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1obw]] is a 3 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=1OBW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1OBW 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]] 1.9&#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=MG:MAGNESIUM+ION'>MG</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=1obw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1obw OCA], [https://pdbe.org/1obw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1obw RCSB], [https://www.ebi.ac.uk/pdbsum/1obw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1obw ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/IPYR_ECOLI IPYR_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/ob/1obw_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=1obw 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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1OBW 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 <scene name='pdbligand=MG:'>MG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Inorganic_diphosphatase Inorganic diphosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.1.1 3.6.1.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OBW OCA].
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*[[Inorganic pyrophosphatase 3D structures|Inorganic pyrophosphatase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Crystal structure of holo inorganic pyrophosphatase from Escherichia coli at 1.9 A resolution. Mechanism of hydrolysis., Harutyunyan EH, Oganessyan VY, Oganessyan NN, Avaeva SM, Nazarova TI, Vorobyeva NN, Kurilova SA, Huber R, Mather T, Biochemistry. 1997 Jun 24;36(25):7754-60. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=9201917 9201917]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Inorganic diphosphatase]]
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[[Category: Large Structures]]
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[[Category: Single protein]]
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[[Category: Avaeva SM]]
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[[Category: Avaeva, S M.]]
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[[Category: Harutyunyan EH]]
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[[Category: Harutyunyan, E H.]]
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[[Category: Huber R]]
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[[Category: Huber, R.]]
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[[Category: Mather T]]
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[[Category: Mather, T.]]
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[[Category: Oganessyan NN]]
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[[Category: Oganessyan, N N.]]
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[[Category: Oganessyan VYu]]
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[[Category: Oganessyan, V Yu.]]
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[[Category: MG]]
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[[Category: 3d-structure]]
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[[Category: hydrolase]]
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[[Category: magnesium]]
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[[Category: metal binding]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:15:54 2008''
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Current revision

STRUCTURE OF INORGANIC PYROPHOSPHATASE

PDB ID 1obw

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