1onw: Difference between revisions

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-[[Image:1onw.jpg|left|200px]]<br /><applet load="1onw" size="350" color="white" frame="true" align="right" spinBox="true"
-caption="1onw, resolution 1.65&Aring;" />
-'''Crystal structure of Isoaspartyl Dipeptidase from E. coli'''<br />
-==Overview==
+==Crystal structure of Isoaspartyl Dipeptidase from E. coli==
-Isoaspartyl dipeptidase from Escherichia coli functions in protein degradation by catalyzing the hydrolysis of beta-L-isoaspartyl linkages in dipeptides. The best substrate for the enzyme reported thus far is iso-Asp-Leu. Here we report the X-ray analysis of the enzyme in its resting state and complexed with aspartate to 1.65 and 2.1 A resolution, respectively. The quaternary structure of the enzyme is octameric and can be aptly described as a tetramer of dimers. Each subunit folds into two distinct domains: the N-terminal region containing eight strands of mixed beta-sheet and the C-terminal motif that is dominated by a (beta,alpha)(8)-barrel. A binuclear zinc center is located in each subunit at the C-terminal end of the (beta,alpha)(8)-barrel. Ligands to the binuclear metal center include His 68, His 70, His 201, His 230, and Asp 285. The two zincs are bridged by a carboxylated lysine residue (Lys 162) and a solvent molecule, most likely a hydroxide ion. The product of the reaction, aspartate, binds to the enzyme by displacing the bridging solvent with its side chain functional group. From this investigation it is proposed that the reaction mechanism of the enzyme proceeds through a tetrahedral intermediate and that the bridging solvent attacks the re face of the carbonyl carbon of the scissile peptide bond. This structural analysis confirms the placement of isoaspartyl dipeptidase into the urease-related amidohydrolase superfamily.
+<StructureSection load='1onw' size='340' side='right'caption='[[1onw]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
+== Structural highlights ==
+<table><tr><td colspan='2'>[[1onw]] is a 2 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=1ONW OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1ONW FirstGlance]. <br>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.65&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=KCX:LYSINE+NZ-CARBOXYLIC+ACID'>KCX</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1onw FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1onw OCA], [https://pdbe.org/1onw PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1onw RCSB], [https://www.ebi.ac.uk/pdbsum/1onw PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1onw ProSAT]</span></td></tr>
+</table>
+== Function ==
+[https://www.uniprot.org/uniprot/IADA_ECOLI IADA_ECOLI] Catalyzes the hydrolytic cleavage of a subset of L-isoaspartyl (L-beta-aspartyl) dipeptides. Used to degrade proteins damaged by L-isoaspartyl residues formation. The best substrate for the enzyme reported thus far is iso-Asp-Leu.<ref>PMID:7876157</ref> <ref>PMID:4880759</ref> <ref>PMID:12718528</ref> <ref>PMID:15882050</ref>
+== Evolutionary Conservation ==
+[[Image:Consurf_key_small.gif|200px|right]]
+Check<jmol>
+  <jmolCheckbox>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/on/1onw_consurf.spt"</scriptWhenChecked>
+    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
+    <text>to colour the structure by Evolutionary Conservation</text>
+  </jmolCheckbox>
+</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=1onw ConSurf].
+<div style="clear:both"></div>
-==About this Structure==
+==See Also==
-ONW 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=ZN:'>ZN</scene>, <scene name='pdbligand=MG:'>MG</scene>, <scene name='pdbligand=NA:'>NA</scene>, <scene name='pdbligand=CL:'>CL</scene> and <scene name='pdbligand=EDO:'>EDO</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1ONW OCA].
+*[[Isoaspartyl dipeptidase|Isoaspartyl dipeptidase]]
+== References ==
-==Reference==
+<references/>
-High-resolution X-ray structure of isoaspartyl dipeptidase from Escherichia coli., Thoden JB, Marti-Arbona R, Raushel FM, Holden HM, Biochemistry. 2003 May 6;42(17):4874-82. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=12718528 12718528]
+__TOC__
+</StructureSection>
 [[Category: Escherichia coli]]
-[[Category: Single protein]]
+[[Category: Large Structures]]
-[[Category: Holden, H M.]]
+[[Category: Holden HM]]
-[[Category: Marti-Arbona, R.]]
+[[Category: Marti-Arbona R]]
-[[Category: Raushel, F M.]]
+[[Category: Raushel FM]]
-[[Category: Thoden, J B.]]
+[[Category: Thoden JB]]
-[[Category: CL]]
-[[Category: EDO]]
-[[Category: MG]]
-[[Category: NA]]
-[[Category: ZN]]
-[[Category: amidohydrolase]]
-[[Category: hydrolase]]
-[[Category: metalloprotease]]
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 14:19:46 2008''